摘要
经过短短十年的发展,钙钛矿太阳能电池效率已经超过25%,极具商业化价值,这得益于三维(3D)钙钛矿材料具有合适的带隙、吸光系数高、电子迁移距离长等优点。但3D钙钛矿的稳定性依然是其亟待解决的问题。二维(2D)钙钛矿器件除了兼具3D钙钛矿的优异光电性质之外,其稳定性良好,是解决3D钙钛矿太阳能电池稳定性问题的一个可行方案。2D钙钛矿晶格中的疏水性大烷基胺阳离子能阻止湿气侵入的可能路径,使其成为光电器件的备选材料。由于2D钙钛矿对许多不同的有机和无机成分具有较高的耐受性,使其组成具有多样性,进而影响其能带变化。本文对2D钙钛矿的带隙调控及能带调控进行总结,希望对制备高效、稳定的低维度钙钛矿太阳能电池具有一定的指导意义。
Perovskite solar cells(PSCs)have achieved more than 25%efficiency in just a decade,which are of great commercial value.This is because the three-dimensional(3 D)perovskite(PVK)layer has many advantages,such as suitable bandgap,high absorption coefficient and long electron diffusion length.However,unstability is still an urgent problem to be solved in 3 D PSCs.Comparing with 3 D perovskite materials,2 D perovskite crystals have recently attracted increasing attention due to some unique properties for improving stability.The hydrophobic bulky alkylammonium cations in 2 D perovskite lattices can block the accessible pathways of moisture invasion,making them promising candidates for optoelectronic devices.Meanwhile,due to the tolerance of 2 D perovskite to organic and inorganic elements,its chemical composition and energy band also change.This review highlights the importance of energy bands in 2 D PSCs and summarizes bandgap regulation and energy level alignment(ELA)of 2 D perovskite,which plays an important role in guiding the preparation of high-efficiency and stable low-dimensional perovskite solar cells.
作者
周亿
胡晶晶
孟凡宁
刘彩云
高立国
马廷丽
Yi Zhou;Jingjing Hu;Fanning Meng;Caiyun Liu;Liguo Gao;Tingli Ma(State Key Laboratory of Fine Chemicals,School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China;Graduate School of Life Science and Systems Engineering,Kyushu Institute of Technology,Hibikino,Wakamatsu,Kitakyushu,Fukuoka 808-0196,Japan;Department of Materials Science and Engineering,China Jiliang University,Hangzhou 310018,China)
出处
《化学进展》
SCIE
CAS
CSCD
北大核心
2020年第7期966-977,共12页
Progress in Chemistry
基金
国家自然科学基金项目(No.21703027,51772039,201903010,51972293)资助。
关键词
2D钙钛矿
钙钛矿太阳能电池
电荷传输
带隙调控
能级对准
2D perovskite
perovskite solar cells
charge transport
bandgap regulation
energy level alignment
