Nanomaterials
·
2022
·Vol. 12
·期 21
·3751
·
IF 5.719
Shindume Lomboleni Hamukwaya,Huiying Hao,Melvin Mununuri Mashingaidze,Tingting Zhong,Shu Tang,Jingjing Dong,Jie Xing,Hao Liu
Lead-free, bismuth-based perovskite solar cells (PSCs) are promising, non-toxic, and stable alternatives to lead-based PSCs, which are environmentally harmful and highly unstable under deprived air conditions. However, bismuth-based PSCs still suffer from low-power-conversion efficiency (PCE) due to their large bandgap and poor film morphology. Their poor film-forming ability is the greatest obstacle to Cs₃Bi₂I₉ progress in thin-film solar cell technology. This study synthesizes novel, lead-free perovskites with a small bandgap, excellent stability, and highly improved photovoltaic performance by integrating different amounts of potassium iodide (KI) into a perovskite precursor solution. KI incorporation improves the crystallinity of the perovskite, increases the grain size, and decreases the potential contact distribution, which is demonstrated by X-ray diffraction, electronic scanning microscopy, atomic force microscopy, and ultraviolet-visible spectroscopy. The Cs₃Bi₂I₉ PSC device with 2 vol. % incorporation of KI shows the highest PCE of 2.81% and Voc of 1.01 V as far as all the Bi-based cells fabricated for this study are concerned. The study demonstrates that incorporating KI in the Cs₃Bi₂I₉ perovskite layer highly stabilizes the resultant PSC device against humidity to the extent that it maintains 98% of the initial PCE after 90 days, which is suitable for solar cell applications. The devices also demonstrate greater resistance to airborne contaminants and high temperatures without encapsulation, opening up new possibilities for lead-free Cs₃Bi₂I₉ PSCs in future commercialization.Keywords:Cs3Bi2I9perovskite solar cells;KI incorporation;crystallinity;morphology;cell stability
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Solar RRL
·
2024
·Vol. 8
·期 5
·2301024
·
IF 6
Ziyu Tan,Hui Xiong,Min Wu,Songyang Yuan,Mengdi Zhan,Wenjian Yang,Jiandong Fan,Wenzhe Li
In advancing high-performance tin-based perovskite solar cells, rapid crystallization and oxidation susceptibility are key challenges. SnF 2 , often added to control crystallization and oxidation, may impact cell performance, particularly postannealing. This study uses in situ variable-temperature X-Ray diffraction to examine SnF 2 's physicochemical behavior and phase transitions in these cells. The analysis highlights how residual SnF 2 affects carrier recombination through energy-level structures. Postfilm formation, SnF 2 chemically interacts with 2,2′:6′,2″-Terpyridine (TPY), forming a stannous fluoride complex that enhances electron transport and energy alignment. Crucially, TPY passivates surface defects and reduces tin vacancies, boosting device stability. The experimental results indicate that the unencapsulated devices in air atmosphere exhibit a stabilized power output retention rate above 90% of the initial efficiency after 29.5 h. After ≈800 h of continuous illumination in ambient air, the conversion efficiency can still be maintained above 100%. Remarkably, t 90 (time to retain 90% efficiency) of the target device in pure oxygen is over 24 h.
研究领域:
材料科学
·
光伏技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 14
·1-9
·
IF 2.8
Qu Xuan,Jiang Jing,Ding Ting,Wang Meng-Wei,Song Yin-Man,Gao Pei-Li,Huang Zi-Bin,Li Ming-En,Su Shi-Chen,Wang Shuang-Peng
Quantum dot light-emitting diodes (QLEDs) hold great potential for next-generation displays, offering outstanding efficiency and exceptional color purity. Nevertheless, their performance remains constrained by poor hole injection and device instability. In this study, a bilayer structure of NiO/NiO x :Mg is proposed for the hole injection layer (HIL) in QLEDs to address these challenges. This bilayer structure enhances the work function, facilitates hole injection, and thereby improves the performance of QLEDs. As a result, the optimized device exhibits nearly twice the current efficiency compared to its NiO-based counterpart, along with an extended T 50 lifetime—approximately eight times longer than that of the NiO-based device. Additionally, Mg doping effectively mitigates photoluminescence quenching in quantum dots, and capacitance–voltage analysis, along with other measurements, confirms the reduction of hole injection barriers. These results suggest that employing bilayer HILs significantly improves QLEDs performance, with possible applications in other optoelectronic devices like perovskite solar cells.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Lingbin Ye,Yun Gao,Yifeng Feng,Xiaofang Zhu,Zichao Ma,Dingshuo Zhang,Yifan He,Haiping He,Zhizhen Ye,Xingliang Dai
Mixed-halide perovskite light-emitting diodes (PeLEDs) face the critical challenge of field-dependent phase separation. Discrete colloidal CsPbX 3 nanocrystals anchored with ligands are promising to suppress phase separation, yet it remains a mystery how ion migration proceeds when integrated into LEDs as emissive films. Specifically, the influence of ion migration inside a single nanocrystal or across the nanocrystals along the electric field on the performance of PeLEDs needs to be decoupled. Here, a low-temperature-assisted transfer-printing method is developed to construct a model PeLED containing a clear CsPbBr 3 -CsPbI 3 nanocrystal film interface for tracing the ion migration between perovskite nanocrystal films along the direction of electric fields. The comprehensive study demonstrates that halogen ions crossing the nanocrystal film interface lead to severe phase separation and poor device stability, rather than the horizontal intra-layer diffusion. The monolayer CsPbX 3 nanocrystal film prevents the field-dependent phase separation caused by interlayer ion migration, significantly improving electroluminescent stability, including spectrum and lifetime. The optimized structure achieves a high external quantum efficiency of 26.9% and a remarkably improved operational half-lifetime of 61.2 h at an initial luminance of 100 cd m −2 in pure-red PeLEDs based on mixed-halide CsPb(I x /Br 1-x ) 3 , more than 300 times longer than the control device using multilayer nanocrystals.
研究领域:
材料科学
·
光电技术
·
纳米科技
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 30
·8234-8241
·
IF 5.976
Chenglin Gao,Hongzhou Dong,Xichang Bao,Yongchao Zhang,Aziz Saparbaev,Liyan Yu,Shuguang Wen,Renqiang Yang,Lifeng Dong
Perovskite solar cells (PSCs) have received extensive attention due to their excellent photovoltaic performance. The quality of perovskite films is crucial to device performance, and introducing additives to the precursor solution is an effective way to control the film morphology and to reduce the defect density. In this paper, formamidine acetate salt (FAAc) is introduced into the precursor solution as an effective additive to greatly improve the quality of perovskite films. With the addition of 5 mol% FAAc, the PSCs with a bis(4-phenyl)(2,4,6-trimethylphenyl)amine (PTAA) hole extraction layer demonstrate desirable performance in terms of the open-circuit voltage (1.04 V), the short-circuit current density (23.16 mA cm−2), the fill factor (close to 80%), the power conversion efficiency (18.90%), negligible hysteresis, and the device stability (up to 80 days). These results will provide a new avenue for fabricating commercial perovskite solar cells.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Science Advances
·
2021
·Vol. 7
·期 16
·
IF 14.143
Zhongwu Wang,Hongzhen Lin,Xi Zhang,Jie Li,Xiaosong Chen,Shuguang Wang,Wenbin Gong,Hui Yan,Qiang Zhao,Weibang Lv,Xue Gong,Qingbo Xiao,Fujin Li,Deyang Ji,Xiaotao Zhang,Huanli Dong,Liqiang Li,Wenping Hu
Interface stresses are pervasive and critical in conventional optoelectronic devices and generally lead to many failures and reliability problems. However, detection of the interface stress embedded in organic optoelectronic devices is a long-standing problem, which causes the unknown relationship between interface stress and organic device stability (one key and unsettled issue for practical applications). In this study, a kind of previously unknown molecular conformation–induced stress is revealed at the organic embedded interface through sum frequency generation (SFG) spectroscopy technique. This stress can be greater than 10 kcal/mol per nm 2 and is sufficient to induce molecular disorder in the organic semiconductor layer (with energy below 8 kcal/mol per nm 2 ), finally causing instability of the organic transistor. This study not only reveals interface stress in organic devices but also correlates instability of organic devices with the interface stress for the first time, offering an effective solution for improving device stability.
研究领域:
材料科学
·
光电子学
·
光谱学
·
固体物理
✓ 已验证
DOI
高影响因子
Science Advances
·
2020
·Vol. 6
·期 51
·
IF 13.117
Xiaodong Li,Sheng Fu,Wenxiao Zhang,Shanzhe Ke,Weijie Song,Junfeng Fang
One big challenge for long-lived inverted perovskite solar cells (PSCs) is that commonly used metal electrodes react with perovskite layer, inducing electrode corrosion and device degradation. Motivated by the idea of metal anticorrosion, here, we propose a chemical anticorrosion strategy to fabricate stable inverted PSCs through introducing a typical organic corrosion inhibitor of benzotriazole (BTA) before Cu electrode deposition. BTA molecules chemically coordinate to the Cu electrode and form an insoluble and polymeric film of [BTA-Cu], suppressing the electrochemical corrosion and reaction between perovskite and the Cu electrode. PSCs with BTA/Cu show excellent air stability, retaining 92.8 ± 1.9% of initial efficiency after aging for 2500 hours. In addition, >90% of initial efficiency is retained after 85°C aging for over 1000 hours. PSCs with BTA/Cu also exhibit good operational stability, and 88.6 ± 2.6% of initial efficiency is retained after continuous maximum power point tracking for 1000 hours.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Shaocong Duan,Qing Sun,Gang Liu,Jianguo Deng,Xiangxin Meng,Bo Shen,Die Hu,Bonan Kang,S. Ravi P. Silva
Organic–inorganic hybrid perovskite solar cells are fabricated using polycrystalline perovskite thin films, which possess high densities of point and surface defects. The surface defects of perovskite thin films are the key factors that affect the device performance. Therefore, the reduction of harmful defects is the primary task for improving device performance. Therefore, in this study, high-quality perovskite thin films are prepared using an ionic liquid, dithiocarbamate diethylamine (DADA), to passivate the interface. The electron-rich sulfur atom in the DADA molecule chelates with the uncoordinated lead ion in the perovskite films, and the diethylammonium cation forms a hydrogen bond with the free iodine ion, which further improves the passivation. The synergistic passivation and improved morphology of the perovskite thin films substantially reduce the number of charged defects on the film surface and prolong the carrier lifetime. In addition, the DADA surface treatment increases the work function of the perovskite film, which is beneficial for carrier transport. Under standard solar-lighting conditions, the power conversion efficiency (PCE) of the device increases from 19.13 to 21.36%, and the fill factor is as high as 83.17%. Owing to both the hydrophobicity of DADA molecules and the passivation of ion defects, the PCE of the device remains above 80%, even for the device stored for 500 h in air at a relative humidity of 65%, and the device stability is substantially improved.
研究领域:
材料科学
·
光伏技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2023
·Vol. 19
·期 50
·2304634
·
IF 13.3
Zhongwu Wang,Yining Ma,Shujing Guo,Liqian Yuan,Yongxu Hu,Yinan Huang,Xiaosong Chen,Deyang Ji,Jinshun Bi,Yong Lei,Cheng Han,Liqiang Li,Wenping Hu
Suppressing the photoelectric response of organic semiconductors (OSs) is of great significance for improving the operational stability of organic field-effect transistors (OFETs) in light environments, but it is quite challenging because of the great difficulty in precisely modulating exciton dynamics. In this work, photostable OFETs are demonstrated by designing the micro-structure of OSs and introducing an electrical double layer at the OS/polyelectrolyte dielectric interface, in which multiple exciton dynamic processes can be modulated. The generation and dissociation of excitons are depressed due to the small light-absorption area of the microstripe structure and the excellent crystallinity of OSs. At the same time, a highly efficient exciton quenching process is activated by the electrical double layer at the OS/polyelectrolyte dielectric interface. As a result, the OFETs show outstanding tolerance to the light irradiation of up to 306 mW·cm −2 , which far surpasses the solar irradiance value in the atmosphere (≈138 mW·cm −2 ) and achieves the highest photostability ever reported in the literature. The findings promise a general and practicable strategy for the realization of photostable OFETs and organic circuits.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 3
·1574-1582
·
IF 11.301
Longkai Yang,Qiu Xiong,Yanbo Li,Peng Gao,Ben Xu,Hong Lin,Xin Li,Tsutomu Miyasaka
High power conversion efficiencies (PCEs) surpassing 20% have been achieved on flexible single-junction perovskite solar cells recently. However, improvements of the open-circuit voltage (VOC) and fill factor (FF), limited by the nonradiative recombination, and the device durability are needed to boost the practical performance further. Herein, we report the use of artemisinin, an herb extract, to passivate the perovskite grains to improve the VOC and FF of flexible PSCs significantly. The incorporation of artemisinin (0.22 mol%) in the perovskite film reduces the film's trap density and thus the nonradiative recombination effectively. As a result, a best PCE of 21.10% is achieved, comparable with state-of-art values of flexible thin-film solar cells (CIGS, CdTe, etc.). VOC reaches 1.126 V, corresponding to a VOC loss of 0.437 V. Moreover, the flexible PSCs incorporated with artemisinin always exhibit excellent stabilities under different aging conditions. Strong interactions between the artemisinin molecules and the uncoordinated Pb2+ ions revealed by theoretical and experimental calculations are responsible for the suppressed formation of new deep-level trap defects, Pb clusters, upon aging.
研究领域:
材料科学
·
能源技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yan Zhao,Beili Pang,Shaojie Zheng,Xiangyu Kong,Mengyuan Zhao,Hongzhou Dong,Liyan Yu,Lifeng Dong
This study investigates the application of trioctylphosphine oxide (TOPO) and triphenylphosphine oxide (TPPO) as an additive to enhance the performance of all-inorganic CsPbBr3 perovskite solar cells (PSCs). The addition of TOPO and TPPO passivates surface defects, increases grain size, and reduces surface trap states, leading to better light absorption and accelerated carrier transport. These modifications lead to an optimized energy level distribution, resulting in a significant increase in power conversion efficiency from 5.14 to 9.21% with TOPO and from 5.14% to 7.28% with TPPO. Furthermore, the long alkyl chains in TOPO provide effective isolation from air and water, significantly enhancing device stability for over 2400 h without packaging. The findings demonstrate that oxygen phosphine additives with long alkane chains are more effective in improving PSCs than those with aromatic hydrocarbons, offering new insights for the use of passivators in perovskite solar cells.
研究领域:
材料科学
·
光伏技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Jianchao Yang,Yu Chen,Weijian Tang,Shubo Wang,Qingshan Ma,Yihui Wu,Ningyi Yuan,Jianning Ding,Wen-Hua Zhang
Achieving high-quality perovskite crystal films is a critical prerequisite in boosting solar cell efficiency and improving the device stability, but the delicate control of nucleation and growth of the perovskite film remains limited success. Herein, a facile but effective strategy has been developed to finely tailor the crystallization of thermally stable cesium/formamidinium (Cs/FA) based perovskite via partially replacing PbI 2 with PbCl 2 in the precursor solution. The incorporation of chlorine into the perovskite crystal lattice derived from PbCl 2 changes the crystallization process and improves the crystal quality, which further results in the formation of larger crystal grains compared to the control sample. The larger crystal grains with high crystallinity lead to reduced grain boundaries, suppressed non-radiative recombination, and enhanced photoluminescence lifetime. Under the optimized conditions, the methylammonium free perovskite solar cells (PSCs) delivers a champion power conversion efficiency (PCE) of 21.30% with an open-circuit voltage as high as 1.18 V, which is one of the highest efficiencies for Cs/FA based PSCs up to now. Importantly, the unencapsulated PSC devices retain more than 95% and 81% of their original PCEs even after long-term (over one year) storage under ambient conditions or 2000 h's thermal aging at 85 °C in a nitrogen atmosphere, respectively.
研究领域:
材料科学
·
能源技术
·
光伏研究
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）