High-κ La2O3 as an anode modifier to reduce leakage current for efficient perovskite solar cells
Jiali GuoWaner HeYue JiangCong ChenXiangyu KongZhengjie XuXubing LuGuofu ZhouYiwang ChenJun‐Ming LiuKrzysztof KempaJinwei Gao
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Perovskite solar cell
Abstract Two‐step deposition method has been widely exploited to fabricate FA 1‐x Cs x PbI 3 perovskite solar cells. However, in previous studies, CsI is mainly added into the PbI 2 precursor with DMF/DMSO as solvent. Here in this study, a novel method to fabricate FA 1‐x Cs x PbI 3 perovskite has been proposed. The CsI is simultaneously added into the PbI 2 precursor and the organic FAI/MACl salts solution in our modified two‐step deposition process. The resulting FA 1‐x Cs x PbI 3 film exhibits larger perovskite crystals and suppressed defect density (4.05×10 15 cm −3 ) compared with the reference perovskite film (9.23×10 15 cm −3 ) without CsI. Therefore, the obtained FA 1‐x Cs x PbI 3 perovskite solar cells have demonstrated superior power conversion efficiencies (PCE=21.96 %) together with better long‐term device stability.
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Solution-processed Cu2O and CuO are used as hole transport materials in perovskite solar cells. The cells show significantly enhanced open circuit voltage V oc, short-circuit current J sc, and power conversion efficiency (PCE) compared with PEDOT cells. A PCE of 13.35% and good stability are achieved for Cu2O cells, making Cu2O a promising material for further application in perovskite solar cells. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
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Perovskite Solar Cells In article number 2300692, Chow, Chang, and co-workers employed Qu-CN as the hole transport material and Qu-COOH as the passivator on the surface of perovskite. Through this optimization, the perovskite has transitioned into the α/δ phase MAPbI3. This advancement has culminated in an impressive power conversion efficiency of 20.64% and excellent device stability in n-i-p PSCs.
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In recent years, the instability of hybrid organic‐inorganic halide perovskite solar cells (PSCs) has been an important challenge. The issue of the destruction as well as a carrier density stability of the perovskite must be addressed to simultaneously achieve the long lifetime of PSCs and acceptable conversion efficiency. Present study aims to address these issues by using all‐inorganic CsPbBr 3 perovskite as a light absorber material. Through a simulation process, the perovskite thickness was optimized yielding the highest power conversion efficiency (PCE) of a device reaching 4.04 %. After storage for 3 months at room temperature with a humidity of 20 % and under illumination of AM 1.5 G, only 35 % loss in PCE was observed, indicating a promising stability of the fabricated CsPbBr 3 ‐based devise.
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Perovskite solar cells have emerged as a potential energy alternative due to their low cost of fabrication and high power conversion efficiency. Unfortunately, their poor ambient stability has critically limited their industrialization and application in real environmental conditions. Here, we show that by introducing hexamine molecules into the perovskite lattice, we can enhance the photoactive phase stability, enabling high-performance and air-processable perovskite solar cells. The unencapsulated and freshly prepared perovskite solar cells produce a power conversion efficiency of 16.83% under a 100 mW cm-2 1.5G solar light simulator and demonstrate high stability properties when being stored for more than 1500 h in humid air with relative humidity ranging from 65 to 90%. We envisage that our findings may revolutionize perovskite solar cell research, pushing the performance and stability to the limit and bringing the perovskite solar cells toward industrialization.
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Perovskite-based solar cell technologies have been a very attractive area of research in recent years. Organic-inorganic perovskite materials are in an increased evolution in power conversion efficiency. Inorganic materials have been tested at the laboratory level but their power conversion efficiency is still limited. In this paper, we used the GPVDM software to study the effect of some parameters on power conversion efficiency in a planar heterojunction solar cell based on CH3NH3PbI3 as an absorbing layer. The modifications were made by considering layers of perovskite without defects. The results show that the efficiency of the power conversion can be improved by adjusting layer thickness; in our case power conversion efficiency was increased from 9.96 % to 12.9 %.
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The power conversion efficiency (PCE) of solution-processed organic–inorganic hybrid perovskite solar cells has been drastically improved. Despite this considerable progress, systematic research on precursor solution chemistry and its effects on photovoltaic parameters has been limited thus far. Herein, we report on the tracking of changes in chemical species in a precursor solution under solar illumination and investigate the correlation between the equilibrium change and the corresponding perovskite film formation. The illuminated perovskite precursors display a higher density of high-valent iodoplumbate, where the resulting perovskite film exhibits reduced defect density with uniform film formation. Conclusively, the perovskite solar cells prepared by the photoaged precursor solution demonstrate not only improved average PCE but also enhanced reproducibility with a narrow PCE distribution. This discovery shows robust control of perovskite precursor solutions from a simple treatment and suggests that the resulting uniform film may be applicable to various halide perovskite-based devices.
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