Advanced Science
·
2019
·Vol. 6
·期 11
·1802046
·
IF 15.804
Cong Chen,Yanjie Wu,Le Liu,Yanbo Gao,Xinfu Chen,Wenbo Bi,Xu Chen,Dali Liu,Qilin Dai,Hongwei Song
Photovoltaic devices employing lead halide perovskites as the photoactive layer have attracted enormous attention due to their commercialization potential. Yet, there exists challenges on the way to the practical use of perovskite solar cells (PSCs), such as light stability and current–voltage ( J – V ) hysteresis. Inorganic perovskite nanocrystals (IPNCs) are promising candidates for high-performance photovoltaic devices due to their simple synthesis methods, tunable bandgap, and efficient photon downshifting effect for ultraviolet (UV) light blocking and conversion. In this work, CsPbBr 3 IPNCs modification could give rise to the vapor phase and solution-processed PSCs with a power conversion efficiency (PCE) of 16.4% and 20.8%, respectively, increased by 11.6% and 5.6% compared to the control devices for more efficient UV utilization and carrier recombination suppression. As far as is known, 11.6% is the most effective enhanced factor for PSCs based on photon downshifting effect inside of devices. The CsPbBr 3 layer could also significantly retard light-induced degradation, leading to the lifetime over 100 h under UV illumination for PSCs. Additionally, the modified PSCs exhibit weak hysteresis and multiple colors of fluorescence. These results shed light on the future design of combining a photon downshifting layer and carrier interfacial modification layer in the applications of perovskite optoelectronic devices.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Hongyu Liu,Yue Zhang,Shuo Song,Xinxin Guo,Liwei Wang,Qiang Fu,Wenzhi Wang
CsPbBr 3 perovskite quantum dots (PQDs) have been considered as potential luminescent materials for lighting and display applications. The oleylamine (OLA) is usually considered to be an indispensable surface ligand in the synthesis of PQDs. However, the long-chain amines can cause more surface defects, resulting in the poor stability and optical performance, which will greatly limit its practical application. Herein, the n-amylamine (ALA) with short carbon chain has been chosen to replace the OLA as surface ligand to synthesize the CsPbBr 3 PQDs. Under the synergic action of oleic acid (OA), ALA-CsPbBr 3 PQDs with enhanced air/thermal stability and optical properties can be obtained through a modified hot-injection method. The ALA-CsPbBr 3 PQDs possess highly monodisperse cubic morphologies (∼10 nm edge lengths), which are similar to the OLA-CsPbBr 3 PQDs. Meanwhile, ligand substitution does not alter the crystal structure, and maintain the cubic crystal structure of CsPbBr 3 . The synthesized ALA-CsPbBr 3 PQDs exhibits a PLQY of 91.3 %, significantly higher than that of OLA-CsPbBr 3 (70.42 %). Photo-stability test indicates that ALA-CsPbBr 3 PQDs are markedly more stable than OLA-CsPbBr 3 PQDs, owing to the passivation of the surface defects. Furthermore, the activation energy of ALA-CsPbBr 3 PQDs (570.8 meV) is higher than OLA-CsPbBr 3 PQDs (495.4 meV), indicating the ALA-CsPbBr 3 PQDs have the much higher thermal stability. In addition, the ALA-CsPbBr 3 PQDs can also be efficiently excited by X-rays, showing a linear response to X-ray radiation, and have good X-ray imaging capability. The CsPbBr 3 PQDs with enhanced stability and optical properties, which are modified by short carbon-chain surface ligands, can further strengthen the competitiveness of PQDs for optoelectronic device applications.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Huiren Zheng,Jize Wang,Junye Pan,Chunyang Zheng,Yuxin Zhang,Ankang Shu,Bin Li,Shaowen Cao,Yong Peng
Underwater photovoltaics plays a pivotal role in photovoltaic applications. However, the underwater solar spectrum differs significantly from that in air, and as water depth increases, solar spectra across various wavebands exhibit distinct attenuation rates. Specifically, the attenuation rate of the red component of sunlight is considerably higher than that of green and blue light (400–600 nm). Thus, under these unique spectral conditions, there is an urgent need to develop stable devices that minimize power conversion efficiency (PCE) loss with increasing water depth. The 4-terminal (4T) structure tandem cell, designed with 2.35 eV CsPbBr3 and 1.63 eV Cs0.05(FA0.83MA0.17)0.95Pb(I0.83Br0.17)3, is prioritized due to its suitable optical response range and low PCE loss with increasing water depth. As CsPbBr3 utilized blue and green light in tandem, which has the highest light intensity underneath water, this study employed doping of SrBr2 into the CsPbBr3 film. This approach reduced the defect density of the film, enhanced carrier transport efficiency, and improved the photoelectric responsivity of the device in the 425–500 nm band. The CsPbBr3 perovskite solar cells that were fabricated demonstrated a high open-circuit voltage of 1.46 V and an exceptional PCE of 7.62%. Additionally, these devices exhibited excellent stability. Consequently, the 4T tandem device achieved PCEs of 15.28, 11.79, and 10.33% at 0, 0.5, and 0.7 m underwater depths respectively, with a variation rate of only 32%. Furthermore, the device demonstrated remarkable stability under working conditions, with an efficiency decay of less than 13% after continuous irradiation for 30 days. These findings suggest that the 4T tandem solar cell holds considerable potential for application in underwater photovoltaics.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Qingyuan Zhou,Xiaohu Zhao,Yuanchen Jiang,Junwei Zhou,Zhen Liu,Kai Pan
One-dimensional CsPbBr3 nanocrystals (NCs) possess significant potential in laser and photodetection fields due to their longer carrier lifetimes, more efficient carrier transport, and anisotropic optical properties. In recent years, Cs4PbBr6 has been employed to synthesize highly luminescent one-dimensional CsPbBr3 NCs; however, the poor stability of CsPbBr3 NCs produced by this method has limited their practical applications. In this study, CsPbBr3 nanorods (NRs) were prepared by removing CsBr from Cs4PbBr6 using a postsynthetic method. Water was added dropwise to Cs4PbBr6 NCs dispersed in a nonpolar solvent. Due to the high solubility of CsBr in water, the Cs4PbBr6 NCs rapidly converted into CsPbBr3 NCs. At this point, the addition of water-induced dipole–dipole interactions within the system drives the self-assembly of CsPbBr3 NCs into NRs. As the amount of water increased, the local concentration of CsPbBr3 NCs also rose, raising the probability of collisions between CsPbBr3 NCs and resulting in the formation of longer NRs. Subsequently, benzoic acid was introduced to replace the ligands removed along with CsBr. Due to the surface passivation effect of benzoic acid, the stability and photoluminescence performance of the CsPbBr3 NRs were significantly enhanced. The resulting CsPbBr3 NRs exhibited a fluorescence lifetime of 45.97 ns and achieved a high photoluminescence quantum yield (PLQY) of 94.2%. Stability tests showed that the ligand-passivated CsPbBr3 NRs retained 65% of their initial photoluminescence intensity after one month of storage in an open atmospheric environment.
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JOURNAL OF MATERIALS SCIENCE
·
2025
·Vol. 60
·期 45
·22850-22864
·
IF 3.9
Wu Yang,Ding Tongshun,Liang Hongfei,Song Juan,Qu Suteng,Xu Yafei,Song Jian
Crystalline silicon solar cells (CSSCs) continue to dominate the photovoltaic market due to their decreasing costs and increasing efficiency. However, as CSSC efficiency approaches the Shockley–Queisser limit, conventional strategies for further performance improvement have become increasingly ineffective. The photon downconversion effect offers a promising solution. However, obtaining stable and efficient downconversion materials remains a significant challenge. This study proposes using trioctylphosphine (TOP) as a passivating ligand for CsPbBr 3 quantum dots, combined with a ZnO protective layer constructed using Zn(C 2 H 5 ) 2 , to enhance stability and performance. The use of 70 μL TOP and 30 μL Zn(C 2 H 5 ) 2 leads to the optimal downshifting film. The resulting CsPbBr 3 QD@TOP@ZnO/EVA composite film exhibits a significant 0.85% enhancement in CSSC efficiency. In addition, after an 18-day PCE stability test on the device, its PCE efficiency stability was comparable to that of EVA film, demonstrating its potential to enhance solar cell performance by downconverting.
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SOLAR ENERGY
·
2019
·
IF 4.674
Fei Zhao,Yixin Guo,Xiang Wang,Jiahua Tao,Jinchun Jiang,Zhigao Hu,Junhao Chu
Inorganic CsPbBr 3 perovskite solar cell (PSC) has attracted much attention owing to its outstanding air and thermal stability and low cost manufacture process. Crystalline TiO 2 (c-TiO 2 ) has been widely used as electron-transporting layer (ETL) material for inorganic CsPbBr 3 PSC. However, c-TiO 2 requires high-temperature (>450 °C) fabrication process which impedes the application of flexible inorganic CsPbBr 3 PSC and its low electron mobility further limits the performance enhancement. Herein, we prepared novel amorphous Nb 2 O 5 (a-Nb 2 O 5 ) ETL through a facile room-temperature sputtering method for inorganic planar CsPbBr 3 PSC. The PSC with a-Nb 2 O 5 ETL has gained a champion efficiency of 5.74%, which is higher than that of the PSC (5.12% or 4.67%) based on crystalline Nb 2 O 5 (c-Nb 2 O 5 ) ETL or c-TiO 2 ETL by high-temperature (500 °C) annealing. The improved photovoltaic characteristic for CsPbBr 3 PSC with a-Nb 2 O 5 ETL may be ascribed to its suitable work function, high optical transmittance, low charge recombination at the a-Nb 2 O 5 /CsPbBr 3 interface and the superior crystallinity of CsPbBr 3 film deposited on a-Nb 2 O 5 ETL. Moreover, the a-Nb 2 O 5 -based CsPbBr 3 PSC without encapsulation exhibits a good long-term stability in ambient atmosphere. This work offers a new research direction for preparing high-performance inorganic PSC.
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高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 17
·5846-5856
·
IF 6.4
Shuangshuang Shi,Hao Lv,Yingchao Ge,Yingying Wang,Shu Xu,Chong Geng
A nanocomposite of perovskite nanocrystals (PNCs) with polymethyl methacrylate (PMMA) provides excellent color quality and processibility for application in wide color-gamut display devices. However, the agglomeration and fluorescent quenching of PNCs in PMMA impeded the development of high-performance PNCs–PMMA film. Here, we report the one-pot synthesis of CsPbBr3 PNCs in methyl methacrylate (MMA) that enables the direct fabrication of bright and durable PNC–PMMA films. The study of growth kinetics reveals that the weak polarity and low viscosity of MMA are important characteristics that promote rapid nucleation and ripening of PNCs at low temperatures. An amine-rich environment and an appropriate precursor concentration are also essential for controlling the isotropic growth and structure of the PNCs. The optimized method offers an attractive route for growing PNCs in a controlled manner, resulting in PNC–MMA with a high photoluminescence quantum yield of 85% and a narrow emission linewidth of 20 nm. An efficient PNC–PMMA thin film was fabricated by the UV-curing of the PNC–MMA solution and tested as a light-conversion layer in an LCD backlight module that showed largely improved optical performance and stability. This route provides a facile and green approach for the fabrication of high-quality PNC–PMMA nanocomposites that will have great potential for display backlighting and other optoelectronic applications.
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高影响因子
OPTICAL MATERIALS
·
2026
·
IF 4.3
Zhaoyan Yang,Yeming Qing,Kai Zhu,Kuo Yang,Shenfei Zong,Zhuyuan Wang
All-inorganic perovskite nanocrystals have emerged as highly effective fluorophores for single molecule localization microscopy (SMLM) imaging due to their remarkable blinking behavior, high photoluminescence quantum yields, and facile synthesis methods. However, the development of all-inorganic perovskite nanocrystals with targeting imaging properties has been limited by their insufficient stability, which presents challenges for their application in the SMLM imaging of cellular microstructures. Herein, a straightforward approach is demonstrated by conjugating cesium lead bromide perovskite nanocrystals (CsPbBr 3 NCs) with streptavidin (SA) using ester-functionalized carboxyl polyethylene glycol (COOH-PEG-NHS) to achieve a core-shell composite of SA-modified CsPbBr 3 NCs (CsPbBr 3 @SA) as an immunofluorescence nanoprobe for SMLM imaging of cellular microstructures. The COOH-PEG-NHS served as a bridging agent that initially reacted with the amine groups of the SA and subsequently integrated with CsPbBr 3 NCs in a single-step process to minimize the impact of the biological modification process on the optical properties of the CsPbBr 3 @SA nanoprobe. The obtained CsPbBr 3 @SA exhibits a significant fluorescence characteristic along with the frequent blinking phenomena. Moreover, SMLM imaging of CsPbBr 3 @SA demonstrated a localization precision of approximately 3 nm and an elevenfold enhancement in spatial resolution. Furthermore, CsPbBr 3 @SA was utilized to label the nuclear lamina of the nuclear envelope via immunofluorescence technique. The improved spatial resolution suggests that CsPbBr 3 @SA is capable of facilitating SMLM imaging of the nuclear lamina. This innovative biological modification method presents significant potential for improving the biological application of all-inorganic perovskite nanocrystals in SMLM.
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ACS Catalysis
·
2026
·
IF 13.6
Xiaodan Ma,Chenyu Du,Fengyi Zhong,Ye He,Yanjuan Sun,Jianping Sheng,Fan Dong
CsPbBr3 perovskite nanocrystals have been investigated as photocatalysts for CO2 reduction owing to their excellent light-harvesting and multi-exciton generation. However, under strong illumination, Pb2+ migration and reduction to metallic Pb0 cause lattice collapse and accelerated carrier recombination, severely limiting their stability and photocatalytic performance. Here, we developed a dynamic valence regulation approach using Eu2+/Eu3+ redox couple to enhance lattice stability and improve photocatalytic performance by suppressing Pb2+ migration and Pb0 exsolution, modulating phonon coupling, and prolonging hot-carrier lifetimes. Experimental analyses suggest that Eu incorporation, together with mixed Eu valence states, is associated with improved lattice stability and reduced Pb-related destabilization under photocatalytic conditions. Moreover, Eu incorporation strengthens lattice rigidity and reduces electron–phonon coupling, which collectively slows down the thermalization of hot carriers. Transient absorption spectroscopy indicates a nearly 4-fold extension in hot-carrier lifetime compared to the pristine counterpart. As a result, the Eu-modified CsPbBr3 exhibits a 6-fold enhancement in CO2-to-CO conversion activity (300 ± 5 mmol·m−2) and maintains over 80% of its activity after continuous operation for 60 h. This work proposes a synergistic redox-lattice-carrier regulation mechanism, providing insights into the rational design of metal halide perovskite photocatalysts.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Zhiqiang Tang,Yusi Wang,Yirui Xu,Kangwu Zheng,Weixiang Sun,Tongtong Xuan,Wei Li,Haoran Zhang,Bingfu Lei,Xuejie Zhang
By adjusting the ZnO content to modulate the glass network structure, self-crystallization of the CsPbBr 3 QDs in borosilicate glass was induced. • The prepared CsPbBr 3 QDs@glass exhibits an IQE and EQE of 39.8% and 29.6% upon 455 nm excitation, respectively. • The prepared CsPbBr 3 QDs@glass demonstrates favorable thermostability and water‑resistant performance. CsPbBr 3 perovskite quantum dots (QDs) are ideal candidate materials for next generation wide color gamut displays, yet their practical application has been hindered by inherent instability. This study achieves in-situ self-crystallization of highly stable and efficient CsPbBr 3 QDs in borosilicate glass (CsPbBr 3 QDs@glass) using ZnO as a glass intermediate oxide. Spectroscopic analyses (FT-IR, Raman, and XPS) reveal that Zn 2+ ions disrupt rigid Si-O-Si and B-O-B bonds to form weaker Zn-O-Si linkages, driving a [BO 4 ] to [BO 3 ] coordination transition. This depolymerization process creates a looser glass network enriched with non-bridging oxygen (NBO), significantly reducing steric hindrance and providing sufficient space for CsPbBr 3 QDs growth. The doping concentration was optimized to 12 mol% ZnO to balance the trade-off luminescence performance between network relaxation and concentration quenching. The optimized sample exhibits an internal quantum efficiency (IQE) as high as 39.8% upon 455 nm excitation. Notably, the CsPbBr 3 QDs@glass retains 52.1% of its initial intensity at 373 K and exhibits negligible attenuation upon cooling. Furthermore, it preserves approximately 97.0% of its luminescence performance even after 10 days of water immersion. Finally, a white LED backlight strip fabricated with the composite exhibits a wide color gamut reaching 124.2% NTSC and 89.4% Rec. 2020 coverage. Assembled into a display screen prototype, the device produces significantly more saturated, vivid green tones than mainstream commercial displays.
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Surfaces and Interfaces
·
2026
·
IF 6
Ziyu Zhou,Jingang Qi,Liang Liu,Danyang Liu,Meixia Lan,Hexuan Zhou,Juntao Liu,Sifan Qiao,Wei Zhang,Xiaoran Huo,Lili Wang
Realizing highly efficient, ultrasmall all-inorganic perovskite quantum dots (QDs) is pivotal for next-generation optoelectronics; however, severe surface defects that typically accompany size reduction remain a significant challenge. Herein, we achieve the synergistic regulation of particle size and surface integrity in CsPbBr 3 QDs via a rapid Pulsed Electric Current (PEC) post-treatment method. Driven by the interplay between the electric-field driving force and transient localized Joule heating, the PEC process enables precise size refinement. Concurrently, this process is hypothesized to trigger highly selective ligand desorption and a thermodynamic rearrangement of bromide ions, effectively filling the exposed surface vacancies. Through quantitative modeling, we established that the size refinement follows a logistic evolution, reaching a saturation theoretical limit of 3.73 nm, while the carrier lifetime exhibits a Gaussian response with a theoretical optimum at ∼361 V. Under optimized conditions (400 V, 60 s, 3 Hz), the mean particle size was reduced from 4.82 nm to 3.76 nm. XPS analysis confirmed an increase in the Br/Pb ratio from 2.3 to 2.5, demonstrating the effective filling of vacancies and compositional optimization. Our synergistic power-law model further reveals that the 4.4-fold enhancement in photoluminescence (PL) intensity is a collective outcome of maximized oscillator strength and defect suppression. This structure-property relationship is validated by carrier dynamics: the suppression of non-radiative channels resulted in a significantly extended average lifetime of 32.92 ns. Ultimately, these fundamental physical and optical improvements reliably translate into exceptional long-term stability under ambient conditions. This study demonstrates that the PEC-guided strategy is a simple and effective physical-field technique for modulating the structure and fundamentally enhancing the optoelectronic performance of perovskite QDs. Download: Download high-res image (209KB) Download: Download full-size image
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高影响因子
CRYSTAL GROWTH & DESIGN
·
2026
·Vol. 26
·期 17
·6875-6885
·
IF 3.6
Li Yanan,Wang Haijun,Yu Qianqian,Chen Yilin,Zhang Fuyuan
Poly(vinylidene
fluoride) (PVDF)-based piezoelectric materials
are commonly constrained by low polar-phase content. Here, we report
an APTES-assisted in situ crystallization strategy to fabricate PVDF/APTES@CsPbBr 3 nanocomposites. APTES acts as a bifunctional linker that
passivates CsPbBr 3 quantum dot surfaces while introducing
protonated ammonium (−NH 3 + ) groups. When
incorporated into electrospun PVDF fibers, these -NH 3 + groups interact with fluorine atoms of PVDF chains via ionic-dipole
interactions, as evidenced by a blue shift of the C–F stretching
band in Fourier-transform infrared (FT-IR). This molecular-level interaction
lowers the free energy barrier for polar phase nucleation, promoting
the transformation from nonpolar α phase to electroactive β
phase, as confirmed by X-ray diffraction (XRD), FT-IR, and differential
scanning calorimetry (DSC). The optimized composite achieves a markedly
higher β-phase fraction compared to pure PVDF and unmodified
CsPbBr 3 composites. As a functional demonstration, the
material delivers substantially enhanced piezoelectric output (130
V) and operates as a self-powered motion sensor. When coupled with
a support vector machine classifier, the system achieves high-accuracy
recognition (94.6%) of diverse human activities. This work establishes
APTES-mediated interfacial engineering as a versatile platform for
controlling polymer crystallization in hybrid systems toward high-performance
piezoelectric applications, with the output enhancement attributed
to a synergistic combination of increased β-phase fraction,
intrinsic piezoelectricity of the perovskite fillers, improved interfacial
stress transfer, and refined fiber morphology.
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