ACS Sustainable Chemistry & Engineering
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2024
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IF 7.1
Rufeng Wang,Jian Ni,Jiayi Guan,Shuai Zhang,Miao Yan,Sen Li,Yaofang Zhang,Juan Li,Hongkun Cai,Jianjun Zhang
All-inorganic CsPbI3 perovskite quantum dots (PQDs) have emerged as promising lighting absorptions for solar cells due to their extraordinary optoelectronic properties and good solution-processability. However, the insulated and dynamic binding characteristics of long-chain ligands on the CsPbI3 PQD surface still challenge their photovoltaic efficiency and stability. Herein, an effective solution-ligand-exchange strategy is developed to modify the surface chemistry of the CsPbI3 PQD utilizing 5-aminopyridine-3-carboxylic acid (5A-3C) during the purification process. Systematic analyses reveal that 5A-3C serves as the multifunctional short-chain ligand to exchange long-chain ligands and is strongly bonded to the CsPbI3 PQD surface, thus facilitating the electronic coupling between neighboring PQDs to promote carrier transport ability. Meanwhile, 5A-3C reduced vacancy defects of the PQD surface and suppressed carrier nonradiation recombination in solar cells. Accordingly, the CsPbI3 PQD solar cells with 5A-3C treatment exhibit a champion power conversion efficiency (PCE) of 15.03%, significantly higher than that of the control device (13.45%). The operation stability of unencapsulated devices has also been significantly improved. This work offers a deep understanding of PQD surface chemistry and provides a feasible avenue to realize high-performance PQD solar cells.
研究领域:
材料科学
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光电子学
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能源科学
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DOI
高影响因子
Small
·
2025
·Vol. 21
·期 8
·2408422
·
IF 12.1
Aleksandr P. Litvin,Jie Guo,Jianxun Wang,Xiaoyu Zhang,Weitao Zheng,Andrey L. Rogach
Metal halide perovskite nanoplatelets (NPls) possess ultra-narrow photoluminescence (PL) bands tunable over the entire visible spectral range, which makes them promising for utilization in light-emitting diodes (LEDs) with spectrally pure emission colors. This calls for development of synthetic methods toward perovskite NPls with a high degree of control over both their thickness and lateral dimensions. A general strategy is developed to obtain such monodisperse CsPbI 3 NPls through the control over the halide-to-lead ratio during heating-up reaction. The excess of iodine precursor changes the chemical equilibrium, thus yielding monodisperse (3 monolayers in thickness) CsPbI 3 NPls whose PL width constitutes ≈22 nm, while the lateral dimensions of NPls are determined by choice of precursor and by the reaction temperature. Postsynthetic cation exchange on the A-site of the perovskite lattice allows for the tuning of the PL peak position, while simultaneous removal of the excess ligands and the surface passivation allows for improvement of the PL quantum yield to 96% and ensures superior stability of optical properties upon storage. Electroluminescent LEDs with the peak values are fabricated for the external quantum efficiency and luminance being 9.45% and 29800 cd m −2 , respectively, and a narrow (≈26 nm) electroluminescence peak at 601 nm.
研究领域:
材料科学
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光电工程
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化学合成
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PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Rui Wang,Chenyu Shang,Qiqi Zhao,Qi Huang,Chenyang Liu,Wenli Xu,Rui Liu,Weiwei Zhang,Jianxu Ding
Cubic α-CsPbI3 is recognized as one of the most promising semiconductors for optoelectronic applications owing to its suitable band gap, excellent optoelectronic performance, and thermal stability. However, its phase instability from α to δ poses a significant obstacle for practical applications. How to stabilize α-CsPbI3 becomes a paramount issue. Here, we propose a strategy in which α-CsPbI3 nanocrystals (NCs) are in situ generated in the Cs4PbI6 single-crystal (SC) matrix through I ion migration, facilitated by its ultralow activation energy (0.104 eV). The existence of the I vacancy can promote ion migration and can increase the content of α-CsPbI3. As α-CsPbI3 NCs are generated in situ, the light yellow Cs4PbI6 SCs convert to black. The lattice of Cs4PbI6 twines outside of α-CsPbI3 NCs without a grain boundary and restricts the migration of I and Cs within the α-CsPbI3 lattice. This mechanism effectively stabilizes α-CsPbI3 for over 2 years without experiencing a phase transition. Such stable α-CsPbI3 NCs exhibit deep red emission (700 nm), a high exciton binding energy (55.5 meV), and a long carrier lifetime (176.9 ns). Furthermore, annealing at 320 °C for 12 h did not result in any damage. Additionally, white-light-emitting diodes (WLEDs) were fabricated using black Cs4PbI6 SCs and yellow phosphor YAG:Ce3+ under an atmospheric environment and realized white emission. The WLEDs maintain approximately 86% luminescence after 18 days or under continuous operation for 12 h, demonstrating high stability and eliminating the need for short-wavelength blue chips. Overall, the α-CsPbI3 NCs deviating from Cs4PbI6 SCs offer an approach to realize highly efficient light-emitting diode applications.
研究领域:
材料科学
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光电技术
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DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Huili Wei,Xiangyu Ji,Jinguo Cao,Wuguang He,Hong Liu,Zexun Pan,Xin Song,Qiang Sun,Jinhua Li,Congcong Wu
The selection of photoactive materials and the design of device structures are critical to the photoelectronic performance of photodetectors. This study reports on a vertically structured photodetector device with rapid, stable, and efficient photoelectric performance across the UV–visible broadband range based on the Si++/SiO2/Au/single-layer graphene/CsPbI3 quantum dots (QDs) configuration. In this specific device structure, a relatively high conductivity Si++/SiO2 wafer was used as the substrate, a CsPbI3 QD film with high light absorption was used as the photoactive layer, and a monolayer graphene with high conductivity was inserted between the substrate and the CsPbI3 QD film to form a heterojunction with the QD film. Based on the Frenkel–Poole emission effect arising from the high trap state density within the SiO2 layer, the device exhibited excellent photoelectric performances. Especially at a wavelength of 365 nm, a photocurrent responsivity of 2319 A/W, a specific detectivity of 1.15 × 1014 Jones, an external quantum efficiency of 7883%, and an on/off time of 39/36 ms at a Si++ terminal voltage of −80 V and an optical power density of 84.03 nW/cm2 can be achieved.
研究领域:
材料科学
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光电子学
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产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2026
·
IF 29.1
Xin Zhang,Yiyuan Tang,Lvming Qiu,Kaifeng Liao,Chenghua Sun,Donal D. C. Bradley,Paul N. Stavrinou,Zhen Wu,Jingsong Huang,Guojie Wang
Perovskite nanocrystals (NCs) demonstrate exceptional potential as emitters to address Rec. 2020 standards for wide color gamut displays. However, the pure-red-targeted CsPbI 3 NCs generally suffer from imprecise synthetic control over emission wavelength and from structural instabilities that significantly diminish performance. We report a novel halogen engineering framework that addresses the otherwise unfavorable wavelength-efficiency-stability nexus. Our approach leverages surface I − ···I 2 interactions to simultaneously unlock exceptional optical characteristics and the elusive structural robustness needed for application. It achieves: (i) controlled quantum-confinement-tuned emission wavelength, (ii) near-unity photoluminescence (PL) quantum yield through iodide vacancy defect management, and (iii) excellent environmental stability, even under harsh (85°C/85%) temperature and humidity conditions, through lattice-distortion suppression. Rec. 2020 compliant, 638 nm peak light-emitting diodes (LEDs) are then demonstrated with Commission Internationale de l'Éclairage coordinates (X, Y) = (0.703, 0.297), 22% external quantum efficiency, luminance ≥ 11,000 cd m −2 , and long lifetime, establishing a materials-by-design paradigm for advancing next-generation perovskite display technologies.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Jin Huang,Huiya Cao,Kaiyuan Gou,Siyu Chong,Yufan Zhou,Jingru Zhang,Shuya Ning,Shengzhong (Frank) Liu
Uncontrolled crystallization and severe interfacial recombination stifle the lifespan and efficiency of all-inorganic CsPbI 3-x Brₓ perovskite solar cells. Therefore, this work introduces an aniline hydrochloride derivative additive, Benzenamine, N-[(2Z)-2-chloro-3-(phenylamino)-2-propen-1-ylidene]-, hydrochloride (BN), to improve the photoelectric performance and stability of the CsPbI 3-x Br x perovskite solar cells. The imine (C=N) groups coordinate with lead-related defects, the -NH 3 + groups form hydrogen bonds with halides, while the C Cl groups enhance lattice stability through electrostatic interactions. In addition, the aromatic skeleton in the BN molecule promotes ordered π-π stacking of molecules at the interface, which not only reduces surface energy but also constructs a hydrophobic protective layer. The optimized BN-based device achieved a maximum efficiency of 21.12%, significantly higher than the 17.27% of the control device. Furthermore, the optimized, unencapsulated device retained 95.6% of its initial efficiency after 1000 h of aging, demonstrating excellent environmental stability. This work validates the potential of aniline hydrochloride derivatives as highly efficient molecular modulators and provides a novel design approach for interface engineering in all-inorganic perovskite photovoltaic devices.
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DOI
高影响因子
ACS Applied Nano Materials
·
2025
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IF 5.5
Xiangyan Li,Quanling Jiao,Liangyu Zhai,Abulikemu Abulizi,Anwar Mamat
Due to their unique photoelectric properties, perovskite quantum dots (PQDs) are of growing interest. The preparation of pure red-emitting perovskite materials is a key step to achieve a full-color display. To date, the precise growth mechanism of CsPbI3 QDs under thermodynamic equilibrium control remains unexplored. We reveal the regulation of reaction parameters on the nucleation and confined growth of pure-red CsPbI3 strongly confined quantum dots (SQDs). Key intermediate perovskite nanoclusters in the formation of SQDs were revealed, and the effects of the ligands and temperature on their growth pathway were systematically investigated. By adjusting the reaction parameters, such as the ligand concentration, ratio, and temperature, control over size, size distribution, and phase (CsPbI3 or Cs4PbI6) can be achieved. Furthermore, our findings shed light on the solubility of PbI2 in this iodine-rich synthesis system and are suggested to aid the understanding of ligand-mediated size and phase control of CsPbI3 QDs.
研究领域:
材料科学
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纳米技术
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光电子学
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量子点
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钙钛矿材料
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DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Yu Lou,Haoran Wang,Zhicong Zhou,Miao Zeng,Zhongliang Yan,Xueying Yang,Pengfei Fu,Arui Huang,Dong Li,Tom Wu,Yang Bai,Hui-Ming Cheng
Pure-red perovskite light-emitting diodes (PeLEDs) are critical for next-generation displays, while existing systems based on mixed Br/I compositions, quasi-2D phases, or colloidal 0D quantum dots are still facing challenges in fulfilling the requirements of the Recommendation BT.2020 (Rec. 2020) red standard. CsPbI3 nanoplatelets (NPLs) whose bandgap depends on thickness-size are a promising candidate for pure-red light-emitting emitters, but their practical use as LEDs has been hampered by the metastability of the emissive CsPbI3 cubic phase. Here, we report the synthesis of stabilized γ-CsPbI3 NPLs with a tailored surface coordination by incorporating a trace amount of dimethyl sulfoxide (DMSO) and N,N’-dimethylpropyleneurea (DMPU) into the precursor. These ligands selectively coordinate with undercoordinated Pb2+ sites in [PbI6]4– octahedra through Lewis acid–base interactions, redistributing the electron density at Pb centers and inducing lattice distortion by the Pb–I–Pb bond angle torsion, thereby stabilizing the γ-phase. The complementary effect of the polarities and the coordination capacities of DMSO/DMPU guide anisotropic growth along the [100] direction, enabling atomic-precision control of the NPL thickness (4 monolayers) to tailor the quantum-confined pure-red emission. The resultant pure-red PeLEDs achieve Commission Internationale de l’Eclairage (CIE) coordinates of (0.708, 0.292), 100% compliance with the Rec. 2020 specification, as well as an external quantum efficiency (EQE) of over 12% and a superior operational lifetime with a half-lifetime (T50) of 360 min, representing the highest reported values for CsPbI3 NPL-based PeLEDs.
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PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2026
·
IF 7
Fuwei Shang,Youkui Xu,Feifei Chai,Xiushan Wang,Xingxuan Zuo,Mengge Zhao,Lin Zheng,ZhenHua Li,Zhun Yao
Two-dimensional (2D) CsPbI3 perovskite shows excellent prospects in the optoelectronics field, attributed to the superior phase stability compared to its 3D counterpart. However, it inherently faces quantum and dielectric confinement effects of the insulating bulky organic cations, leading to poor carrier transport kinetics. Here, we developed diamine cations [OEA, 2,2-oxybis(ethylamine)] and [EDBE, 2,2-(ethylenedioxy)bis(ethylamine)] with extended C–O chains for 2D Dion–Jacobson (DJ) CsPbI3 perovskites, aiming to avoid the undesirable charge tunneling barrier across the organic interlayer. Detailed characterization reveals that EDBE eliminates electron adsorption during interlayer transport, optimizing band alignment and enhancing the Pb-s orbital contribution at the valence band maximum (VBM), which leads to improved carrier lifetime. Through strategic molecular design, the extended dual-functional groups in EDBE strengthen hydrogen bonding and reduce interlayer distance, resulting in compact films with an enhanced carrier lifetime. More importantly, the EDBE spacer induces perovskite crystalline growth with a preferred vertical orientation and forms a multiphase distribution to facilitate carrier transport. Owing to these advantages, the optimized 2D DJ EDBECs4Pb5I16 solar cells deliver a champion power conversion efficiency (PCE) of up to 11.21%. Importantly, the devices exhibit exceptional stability, retaining 90% of their initial PCE after 720 h at 85 °C. It is believed that extended C–O chain engineering paves an effective route for solving carrier transport problems in 2D CsPbI3.
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高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 39
·22539-22549
·
IF 10.733
Bo Li,Yanan Zhang,Lin Fu,Luyuan Zhang,Zhongyuan Liu,Longwei Yin
Owing to their prominent thermal stability, inorganic halide perovskites have been deemed as promising substitutes for organic–inorganic hybrid perovskites; however, their application is hindered by their mediocre efficiency. High exciton binding energies in inorganic perovskites have been considered to be one of the main obstacles, which lead to insufficient separation of bound excitons and low photocurrent output. Herein, we demonstrated an effective strategy to enhance the exciton dissociation efficiency in inorganic perovskites by incorporating layer-structure-tunable two-dimensional black phosphorous. Importantly, the energy-level configuration and work function alignment of multi-layer black phosphorous can be tuned by adjusting the number of layers, which induces built-in electric field formation and boosts interfacial charge carrier transfer. Furthermore, it is revealed that multi-layer black phosphorous can increase relative permittivity due to its efficient dielectric screening effect in a local dielectric environment, thus diminishing the exciton binding energy, enhancing the exciton dissociation efficiency and leading to a significant increase in the free carrier density of inorganic perovskites. The multi-layer black phosphorous–CsPbI3 heterostructure perovskite solar cells (PSCs) with the inorganic CuSCN hole-transport-layer (HTL) exhibit the current density of 19.3 mA cm−2 and the power conversion efficiency (PCE) of 14.17%, which is one of the highest efficiencies reported to date for PSCs with all-inorganic materials.
研究领域:
材料科学
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光电子学
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纳米科技
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能源材料
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半导体物理
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光伏技术
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DOI
高影响因子
Small
·
2020
·Vol. 16
·期 50
·2005246
·
IF 11.459
Qiufeng Ye,Fei Ma,Yang Zhao,Shiqi Yu,Zema Chu,Pingqi Gao,Xingwang Zhang,Jingbi You
Cesium lead iodide (CsPbI 3 ) perovskite has gained great attention due to its potential thermal stability and appropriate bandgap ( ≈ 1.73 eV) for tandem cells. However, the moisture-induced thermodynamically unstable phase and large open-circuit voltage ( V OC ) deficit and also the low efficiency seriously limit its further development. Herein, long chain phenylethylammonium (PEA) is utilized into CsPbI 3 perovskite to stabilize the orthorhombic black perovskite phase (γ-CsPbI 3 ) under ambient condition. Furthermore, the moderate lead acetate (Pb(OAc) 2 ) is controlled to combine with phenylethylammonium iodide to form the 2D perovskite, which can dramatically suppress the charge recombination in CsPbI 3 . Unprecedentedly, the resulted CsPbI 3 solar cells achieve a 17% power conversion efficiency with a record V OC of 1.33 V, the V OC deficit is only 0.38 V, which is close to those in organic-inorganic perovskite solar cells (PSCs). Meanwhile, the PEA modified device maintains 94% of its initial efficiency after exceeding 2000 h of storage in the low-humidity controlled environment without encapsulation.
研究领域:
材料科学
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光伏技术
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能源研究
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DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Wenbo Li,Duoling Cao,Xiaorui Zhu,Zhiguang Guo,Li Wan,Xu Zhang,Xiuhua Zhang,Yuebin Li,Xiaoming Ren,Xianbao Wang,Dominik Eder,Shimin Wang
Cesium lead triiodide (CsPbI3) perovskite with excellent thermal stability owing to its inorganic components has an appropriate band gap and requires no mixed halides for an application in Si tandem solar cells. However, CsPbI3 solar cells have poorer power conversion efficiency (PCE) than organic–inorganic hybrid perovskite solar cells (PSCs) with the same band gap. Tuning electron transport layers (ETL) is an effective method to promote PCE and suppress its hysteresis in PSCs. In this study, the tin dioxide (SnO2) surface was modified with tetrabutylammonium chloride (TBAC), tetrabutylammonium bromide, or tetrabutylammonium iodide. The tetrabutylammonium halogen interlayers increase the conductivity of the SnO2-ETL while lowering the work function, thus making the electron transport more efficient. Moreover, these interlayers alter the SnO2 surface roughness, facilitating high-quality CsPbI3 films with bigger grain sizes and fewer grain boundaries and hence reduced Eloss for PSCs with improved PCE. The optimized carbon counter electrode (CE)-based hole transport layer-free device of fluoride-doped tin oxide/SnO2/TBAC/CsPbI3/C achieves the relatively highest PCE of 12.85%, which is larger than that of pristine PSCs (10.51%) and is also one of the highest efficiencies reported to date for planar-structured CsPbI3 PSCs based on a carbon CE. Our work demonstrates a facile approach of simultaneously optimizing the SnO2-ETL and CsPbI3 film for the construction of efficient carbon CE-based CsPbI3 solar cells.
研究领域:
材料科学
·
能源技术
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产品关联
DOI
高影响因子
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