Symmetrical dicyano-based imidazole molecule-assisted crystallization and defects passivation for high-performance perovskite solar cells

IF 4.5 3区化学 Q1 Chemical Engineering

Journal of Electroanalytical Chemistry Pub Date : 2023-10-13 DOI:10.1016/j.jelechem.2023.117857

Xumeng Hu , Shaolin Chen , Shiqi Huang , Minghuang Guo , Jingwei Zhu , Ping Hu , Yafeng Li , Mingdeng Wei

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引用次数: 0

Abstract

Benefiting from the simple and low-cost fabrication of the one-step anti-solvent spin-coating process, the perovskite solar cells (PSCs) have a boost development. However, a great number of defects are generated during solution-fabrication process, retarding the development of PSCs seriously. In this study, the utilization of 4,5-dicyanoimidazole (DCI) as an additive for perovskite precursor solution was investigated. The presence of the double –CN groups in DCI facilitated the formation of Lewis acid-base coordination with unsaturated Pb²⁺ ions, as well as interaction with I^- anions by the –NH- moiety, resulting in the enhanced perovskite film crystallinity, the reduced grain boundaries, and a significant reduction in the defects density of the perovskite film. The decreased trap-assisted recombination and voltage open circuit (V_OC) losses in the PSC resulted in the improved photovoltaic performance of device treated by DCI molecule, the PCE increased from 19.59 % to 21.87 % significantly. Moreover, the unencapsulated device with DCI additive exhibited a remarkable 87.8 % retention of its initial PCE after exposure under 10–20 % relative humidity for 60 days, demonstrating an excellent stability than control device.

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高性能钙钛矿太阳能电池的对称二氰基咪唑分子辅助结晶和缺陷钝化

得益于一步反溶剂旋涂工艺的简单和低成本制造，钙钛矿太阳能电池（PSC）得到了发展。然而，在溶液制备过程中会产生大量的缺陷，严重阻碍了PSCs的发展。在本研究中，研究了4，5-二氰基咪唑（DCI）作为钙钛矿前体溶液的添加剂的应用。DCI中双-CN基团的存在促进了与不饱和Pb2+离子形成Lewis酸碱配位，以及通过-NH-部分与I-阴离子的相互作用，从而增强了钙钛矿膜的结晶度，减少了晶界，并显著降低了钙钛矿膜中的缺陷密度。PSC中陷阱辅助复合和电压开路（VOC）损失的降低导致DCI分子处理的器件的光伏性能提高，PCE从19.59%显著提高到21.87%。此外，含有DCI添加剂的未封装装置在10–20%相对湿度下暴露60天后，其初始PCE的保留率为87.8%，表现出比对照装置优异的稳定性。

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来源期刊

Journal of Electroanalytical Chemistry Chemical Engineering-General Chemical Engineering

CiteScore

7.50

自引率

6.70%

发文量

912

审稿时长

>12 weeks

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.