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 (VOC) 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.
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.
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