材料科学
化学工程
钙钛矿(结构)
过程(计算)
纳米技术
工程物理
工艺工程
计算机科学
操作系统
工程类
作者
Annie Ng,Zhiwei Ren,Hanlin Hu,W.K. Fong,Qian Shen,Sin Hang Cheung,Pingli Qin,Jin Wook Lee,Aleksandra B. Djurišić,Shu Kong So,Gang Li,Yang Yang,C. Surya
标识
DOI:10.1002/adma.201804402
摘要
Abstract A cryogenic process is introduced to control the crystallization of perovskite layers, eliminating the need for the use of environmentally harmful antisolvents. This process enables decoupling of the nucleation and the crystallization phases by inhibiting chemical reactions in as‐cast precursor films rapidly cooled down by immersion in liquid nitrogen. The cooling is followed by blow‐drying with nitrogen gas, which induces uniform precipitation of precursors due to the supersaturation of precursors in the residual solvents at very low temperature, while at the same time enhancing the evaporation of the residual solvents and preventing the ordered precursors/perovskite from redissolving into the residual solvents. Using the proposed techniques, the crystallization process can be initiated after the formation of a uniform precursor seed layer. The process is generally applicable to improve the performance of solar cells using perovskite films with different compositions, as demonstrated on three different types of mixed halide perovskites. A champion power conversion efficiency (PCE) of 21.4% with open‐circuit voltage ( V OC ) = 1.14 V, short‐circuit current density ( J SC ) = 23.5 mA cm −2 , and fill factor (FF) = 0.80 is achieved using the proposed cryogenic process.
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