ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Sixin Chen,Meng Xu,Zhaolin Song,Yiran Shi,Ruichen Bai,Wanqi Jie,Menghua Zhu
Inorganic halide perovskite thin-film X-ray detectors have attracted great research interest in recent years due to their high sensitivity, low detection limit, and facile fabrication process. The poor crystal quality of the thin film with uncontrollable thickness and low background voltage during detection limits its practical application. Here, a high-quality CsPbBr3–xIx (x = 0, 1) columnar crystal film is prepared by an improved melt-confined method with a porous anodic aluminum oxide (AAO) template, which stabilizes the disorder perovskite systems of CsPbBr2I by stress. The AAO-CsPbBr3–xIx (x = 0) detectors exhibit high detection accuracy and photoelectric conversion capability with an ultrahigh sensitivity of 32,399.5 μC·Gyair–1·cm–2 at 2142.9 V mm–1 under 20 kVp X-rays and 19,217.4 μC·Gyair–1·cm–2 with a higher background electric field of 6666.7 V mm–1 for AAO-CsPbBr3–xIx (x = 1). Moreover, the AAO-CsPbBr3–xIx (x = 1) film detector acquires a lower detection limit of 7.65 nGy·s–1 and a higher X-ray imaging spatial resolution of 1.6 LP/mm and 8.6 nGy·s–1 and 1.4 LP/mm for AAO-CsPbBr3–xIx (x = 0). The facile, high-quality columnar crystal film devices display great potential for low-energy and low-dose X-ray imaging in flat panel detection applications.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Ou Hai,Peng Li,Xin An,Weikang Dong,Tong Li,Zechuan Qi,Yuanting Wu
In order to broaden the application field of long afterglow materials, it is a challenge to realize high stability and multicolor properties of long afterglow materials. The photoconversion method is a condition that enables simultaneous afterglow color shifts, however, the stable and efficient photoconversion agent is an urgent problem. This study propose a strategy to synthesize CsPbBr 3 quantum dots (QDs) directly within porous SiO 2 on the surface of Sr 2 MgSi 2 O 7 :Eu 2+ ,Dy 3+ (SMS). The resulting composites achieve a shift in emission and afterglow color from blue (about 468 nm) to green (about 520 nm), and in the UV irradiation for 8 days, the luminous intensity is almost unaffected, in the air exposure for 3 months, the luminous intensity can still be maintained at more than 80 % of the initial value. Since the synthesized composite material is a powder, it can be mixed with various media. Composite materials can be homogeneously mixed with coatings, resulting in coatings with a variety of luminescent colors and producing effective multicolor luminescence, which has significant potential in the field of luminescent coatings and anti-counterfeiting.
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高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 18
·2400141
·
IF 8
Hongyu Yang,Jingzhou Li,Zhanpeng Wang,Yichi Zhong,Hanhuai Yang,Hongxing Dong,Long Zhang
Lead halide perovskite quantum dots (LHP QDs) emerge as versatile photonic sources in electroluminescence and laser devices. Their applications in optoelectronic devices are hindered by surface distortion and ligand stripping during the purification process. In addition, the device performance roll-off suffers from the ultrafast non-radiative Auger recombination (AR). To address these issues, herein, CsPbBr 3 QDs are prepared with sizes ranging from 6.5 to 9.2 nm and the universal surface repairing strategy is proved to efficiently increase the biexciton lifetime and quantum yield up to 1.4 and 3 times, respectively. The strategy provides a PbBr x rich surface and strong binding didodecyldimethylammonium bromide (DDAB) ligands to achieve near-unity photoluminescence efficiency, which significantly improves their stability against anti-solvents and aging in ambient conditions. A single-mode laser device is realized by self-assembling the QDs into superlattice as optical microcavity, with low threshold of 9.45 µJ cm −2 , quality factor of 2187 and ultrafast lifetime of 3.22 ps. The superlattice laser is demonstrated as an optical encoder with large coding bandwidth of 0.133 THz. This work proposes new insight into the non-radiative AR process in these single-component CsPbBr 3 QDs, and will pave the way for optoelectronic devices working in intense conditions.
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Nano Materials Science
·
2025
·
IF 17.9
Tianle Wang,Zhenpeng Cheng,Zhaofa Ding,Yiliang Zhang,Yufei Deng,Mingyu Li,Lei Wang,Haifei Lu,Xiaoyan Wen,Sisi Liu
With the development of high-resolution display technologies with vision health consideration, the absent emission wavelengths on the long-wavelength blue light (460 nm to 480 nm) of CsPbBr 3 quantum dots (QDs) has become a crucial hindrance for the wide color gamut displays, and the tunable emission wavelengths via size control can unfortunately suffer from the ligand shedding. In the light of chlorophylls, the CsPbBr 3 QD decorated Ti 3 C 2 nanosheets (CQDTs) are in-situ synthesized with a controllable emission wavelength range from 455 nm to 505 nm at room temperature. The growth rate of CsPbBr 3 QDs can be retarded due to a relatively lower total energy during the adsorption of precursors on Ti 3 C 2 nanosheets, thus the improved monodispersity of resulting QDs in turn results in the photoluminescence quantum yield at 505 nm (∼100%) and at 455 nm (∼42%). Providing with the strong binding energy between CsPbBr 3 QDs and Ti 3 C 2 nanosheets, the decomposition of perovskite can be efficiently hindered, endowing an excellent stability. The enhanced stability of the flexible light-emitting films fabricated with CQDT is witnessed with a remained luminescence intensity of 77% (pristine is 45%) after 40 000 bending cycles, and the CQDT LED possesses the chromatic coordinates of (0.06, 0.61), (0.71, 0.28), (0.12, 0.06) with a ∼107% NTSC color gamut.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Wenyu Zhang,Xiaojie Liu,Benlin He,Jingwei Zhu,Xueke Li,Kaixiang Shen,Haiyan Chen,Yanyan Duan,Qunwei Tang
The perovskite solar cells (PSCs) based on cesium lead bromide (CsPbBr3) with outstanding environmental stability and low preparation cost are regarded as one of the most promising photovoltaic devices for commercial applications. However, the performance of CsPbBr3 PSCs can be badly deteriorated by the intense charge recombination arising from the ionic defects at the grain boundaries of perovskite film. To cope with this issue, we adopt an amino acid of l-lysine with two amino and one carboxyl groups as a chemical additive to incorporate into perovskite film to simultaneously anchor the uncoordinated Pb2+ (Cs+) and halogen ion defects. Further, the grain size of CsPbBr3 perovskite is boosted from 688 to over 1000 nm after l-lysine incorporation as a result of the decreased nucleation rate and the sufficient growth of perovskite, which effectively reduce the grain boundaries for load defects. As expected, the optimized device achieves a best power conversion efficiency of 9.69% attributed to the remarkably reduced charge recombination and enhanced charge extraction arising from the efficient defects dual-passivation and enlarged grain size of perovskite film as well as the improved energy level alignment at the device interface after the introduction of l-lysine, which is elevated by 61.23% in comparison to 6.01% efficiency of the pristine one. Moreover, the unencapsulated device with l-lysine incorporation exhibits remarkable long-term stability in air with 80% RH at 25 °C and 0% RH at 80 °C as well as under continuous illumination conditions. This work provides an effective multifunctional additive for imperfection passivation and grain size enlargement of perovskite to build PSCs with high efficiency and stability.
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高影响因子
Nano Energy
·
2018
·
IF 13.12
Xingyue Liu,Xianhua Tan,Zhiyong Liu,Haibo Ye,Bo Sun,Tielin Shi,Zirong Tang,Guanglan Liao
All-inorganic CsPbBr 3 perovskite solar cells (PSCs) have attracted tremendous attentions in the photovoltaic field these days in view of their outstanding stability, especially thermal stability. However, the bromide-rich perovskite , such as CsPbBr 3 , always suffer from a low phase-purity and poor morphology synthesized by traditional two-step deposition route. Herein, we demonstrate a facile multistep spin-coating strategy to fabricate high-quality CsPbBr 3 films on the low-temperature processed compact TiO 2 ( c -TiO 2 ) electron transport layer (ETL) of the carbon-based PSCs. As-prepared films exhibit more homogeneous with higher CsPbBr 3 -phase purity and larger average grain sizes up to 1 µm, compared to those prepared through traditional two-step deposition process . The champion power conversion efficiency (PCE) of the planar CsPbBr 3 PSC is boosted from 7.05% to 8.12%, getting an increase by 15.2%, due to the increased crystallinity and light-harvesting ability as well as reduced trap states of the CsPbBr 3 film. To further enhance the device performance, a SnO 2 thin layer with much higher carrier mobility than TiO 2 is introduced to passivate the c -TiO 2 ETL. It is found that the SnO 2 layer can not only improve the surface morphology of the ETL, but also reduce the current shunting pathways in the c -TiO 2 . The TiO 2 /SnO 2 bilayered ETL possesses a superior electron extraction capability, beneficial to the charge transport and suppression of the interfacial trap-assisted recombination. The best-performing TiO 2 /SnO 2 -based CsPbBr 3 PSC delivers an excellent fill factor of 0.817 and a high PCE of 8.79%, which is the highest efficiency for planar CsPbBr 3 PSCs reported to date. More importantly, the unencapsulated all-inorganic PSCs show a promising humidity and thermal stability with no decline in efficiency when stored in ambient air at room temperature (25 °C) for over 1000 h and 60 °C for one month, respectively. Our work pave the ways for practical applications of cost-effective, highly efficient and stable all-inorganic PSCs.
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高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2019
·
IF 6.019
Fan Bu,Benlin He,Yang Ding,Xueke Li,Xuemiao Sun,Jialong Duan,Yuanyuan Zhao,Haiyan Chen,Qunwei Tang
Carbon-based hole-transporting material (HTM)-free CsPbBr 3 perovskite solar cells (PSCs) provide new opportunities for promoting the commercial application of PSCs because of the low cost, simple preparation process and excellent stability under various extreme conditions. One of the remaining problems for inorganic CsPbBr 3 PSCs is the low power conversion efficiency (PCE) due to the large energy level difference and inefficient hole extraction at CsPbBr 3 /carbon interface. Herein, polyaniline/graphite (PANi/G) composites are incorporated into carbon electrode to tailor work function and to improve hole-selectivity of back electrode for enhanced energy level alignment and interfacial hole extraction, leading to a remarkably reduced energy loss and charge recombination. The HTM-free CsPbBr 3 PSC based on carbon-PANi/G electrode achieves a PCE of 8.87%, which is increased by 43.8% in comparison with 6.17% for the control device. Moreover, the unencapsulated device shows excellent long-term moisture tolerance with the initial PCE maintaining 93.5% even exposure to air atmosphere with 80% RH at 25 °C over 50 days. The successful improvement of energy level alignment and charge extraction in device by directly incorporating PANi/G composites into carbon electrode offers a promising strategy in developing low-cost and efficient HTM-free PSCs.
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高影响因子
VACUUM
·
2022
·
IF 4.11
Ruxin Guo,Yan Zhao,Quanrong Deng,Yongshang Zhang,Zhiheng Wu,Yanyan Duan,Wei Zhang,Yonglong Shen,Guosheng Shao
Perovskite solar cells (PSCs) have become a promising research direction in photovoltaic field, where the evolution of the transparent conductive oxides (TCOs) electrodes, a vital part of photovoltaic devices, has played a distinctive role in their development. To date, the indium tin oxide (ITO) and fluorine-doped tin oxide (FTO) have been widely used as TCOs in state-of-the-art PSCs. However, the energy level matching between the TCO electrodes and the electron transport layers (ETLs) are usually ignored. Herein, Ta doped SnO 2 (TTO) films have been prepared by the high target utilisation sputtering (HiTUS) technology, which exhibited the lowest resistivity of 7.8 × 10 −4 Ω cm and the average transmittance in the visible light region over 85%. A maximum power conversion efficiency (PCE) with 6.48% was achieved when the TTO films as the bottom electrodes in CsPbBr 3 PSCs, higher than that of PSCs based on FTO (5.36%). Especially, the open-circuit voltage ( V oc ), short-circuit current ( J sc ) and fill factor ( FF ) were all enhanced, which were attributed to the suitable energy level matching between the TCOs and ETLs layers and their low interface roughness. This work demonstrates the band structure of the TCOs and ETL layers and the roughness of TCOs have more important influence on the PCE of PSCs under the similar optical and electrical properties of TCOs condition.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 50
·e202201095
·
IF 5.02
Peng Gao,Zihao Cui,Xiaolei Liu,Yaqiang Wu,Qianqian Zhang,Zeyan Wang,Zhaoke Zheng,Hefeng Cheng,Yuanyuan Liu,Qing Li,Baibiao Huang,Peng Wang
Graphical Lead halide perovskite has triggered a lot of research due to its superior optical properties. However, halide perovskite materials have poor environmental stabilities and are easily affected by external factors such as water and heat, resulting in structural decomposition and performance failure. Contrary to this commonplace concept, CsPbBr 3 can convert to CsPb 2 Br 5 partially when meeting a small amount of water, and the CsPbBr 3 @CsPb 2 Br 5 composite is synthesized by an in situ method accordingly. The CsPbBr 3 @CsPb 2 Br 5 composite shows an enhanced catalytic performance compared with pure CsPbBr 3 , as well as a dramatically synergistic effect of photo and thermal for catalytic CO 2 hydrogenation. Lead halide perovskite has triggered a lot of research due to its superior optical properties. However, halide perovskite materials have poor environmental stabilities and are easily affected by external factors such as water and heat, resulting in structural decomposition and performance failure. Contrary to this commonplace concept, it is found that CsPbBr 3 (CPB) can convert to CsPb 2 Br 5 (CP2B5) partially when meeting a small amount of water, and the CsPbBr 3 @CsPb 2 Br 5 (CPB@CP2B5) composite is synthesized by an in situ method accordingly. The CPB@CP2B5 composite shows an enhanced catalytic performance compared with pure CPB, as well as a dramatically synergistic effect of photo and thermal for catalytic CO 2 hydrogenation. The CO production rate of CPB@CP2B5 is determined as 69 μmol g −1 h −1 under light irradiation at 200 °C, which is 156.8 and 43.4 times higher than that under pure photo (0.44 μmol g −1 h −1 ) and pure thermal (1.59 μmol g −1 h −1 ) condition, respectively. Meanwhile, the CPB@CP2B5 sample is also stable, which shows no significant decline in the catalytic activity during 8 cycles of repeated experiments. The probable mechanism is explored by utilizing a series of in situ characterizations.
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 48
·17211-17221
·
IF 7.059
Chenyang Wang,Yongjin Long,Xiaohui Liu,Shiqiang Fu,Jiahao Wang,Jing Zhang,Ziyang Hu,Yuejin Zhu
Carbon-based all-inorganic cesium lead bromide (CsPbBr3) halide perovskite solar cells (PSCs) have attracted tremendous attention owing to their low cost, simplified preparation, and outstanding stability even under harsh conditions. However, the CsPbBr3 perovskite always suffers from an undesirable crystallization and film morphology with incomplete coverage and numerous grain boundaries. Herein, a novel dual promotion strategy combining interface modification with ion doping is proposed to achieve highly efficient and stable carbon-based planar CsPbBr3 PSCs. A thin CsBr modified layer was first inserted between the compact TiO2 (c-TiO2) and PbBr2 layers, wherein the crystallization of PbBr2 can be enhanced and then assist the growth of perovskite grains can be provided, so that CsPbBr3 films can reduce pinhole generation and accelerate carrier extraction, and decrease the hysteresis effect. Then an appropriate cobalt (Co2+) ion is doped into the CsPbBr3 film, which not only increases the grain size with decreasing grain boundary, but also ameliorates the energy level and recombination. Consequently, the champion power conversion efficiency (PCE) of the CsPbBr3 PSCs reaches up to 8.67% with an increment of about 30%. Moreover, the best-performing PSC without encapsulation also displays excellent humidity and thermal stability, maintaining above 98% of its initial PCE in an air atmosphere after 100 days, and over 95% under heat treatment at 85 °C after 600 hours, respectively. This study provides a promising route to boost the performance of all-inorganic perovskite solar cells.
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高影响因子
Materials Horizons
·
2025
·
IF 10.7
Menglong Gao,Yao Guo,Shiding Zhang,Yinghui Xue,Jianxin Li,Shuaishuai Hu,Haixiang Song,Kaidi Wu,Miaomiao Li,Huihui Zhao,Zhongyuan Zhou,Qing Shen
We study the interface properties of CsPbBr3/Nb2O5 and CsPbBr3/Ta2O5 heterojunctions for structural, electronic, and optical characteristics. First-principles calculations were performed to analyze interfacial binding energy, electronic local function (ELF), charge density difference, and electrostatic potential. Four interface configurations were constructed based on CsPbBr3 (100) and M2O5 (001) terminations, revealing that the PbBr/TaO interface exhibits the highest binding energy (0.0073 eV Å−2), indicating superior stability. Charge transfer calculations demonstrate electron migration from CsPbBr3 to M2O5, forming an internal electric field that promotes charge separation. ELF and charge density difference maps highlight strong covalent interactions at the interfaces, particularly in the PbBr/TaO interface. Experimental characterization via XRD, SEM, TEM and XPS confirms successful heterojunction formation with preserved crystallinity. These findings provide theoretical and experimental insights into optimizing M2O5-based electron transport layers to enhance PSC efficiency and stability.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Jiejun Ren,Boheng Dong,Xiaopeng Zhou,Huiping Liu,Churen Zhang,Fan Liu,Liangjun Chen,Yuhua Wang
Halide perovskites have risen as promising circularly polarized luminescent (CPL) materials for applications in 3D displays, optical anti-counterfeiting, and information storage. And yet, achieving highly anisotropic CPL emission from achiral halide perovskites remains fraught with challenges. Herein, the helical channels of chiral MOFs (L/D-MOFs) are utilized as chiral templates for the in-situ growth of CsPbBr 3 perovskite nanocrystals (NCs), generating CPL-active CsPbBr 3 @L/D-MOFs materials with high luminescence dissymmetry factors (|g lum |, 8.39×10 −3 ) and high photoluminescence quantum yields (QY, 78%). Synchrotron-radiation-based X-ray absorption spectroscopy clearly verifies that the embedded CsPbBr 3 NCs inherit the helicity of L/D-MOFs through strong Cd─Br coordination bonds, thereby facilitating chirality transfer from L/D-MOFs to CsPbBr 3 NCs. Additionally, the efficient Förster resonance energy transfer (FRET) from chiral L/D-MOFs to CsPbBr 3 NCs further amplifies the CPL signal of CsPbBr 3 NCs. Benefiting from the excellent CPL properties and tunable emission, the CsPbX 3 @L/D-MOFs demonstrate great potential in CPL-LEDs. This work proposes a viable strategy for the rational design of high-performance CPL-active perovskite materials and offers profound insights into the chirality transfer mechanism.
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