Highly Reproducible Perovskite Solar Cells with Average Efficiency of 18.3% and Best Efficiency of 19.7% Fabricated via Lewis Base Adduct of Lead(II) Iodide

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• 作者：Namyoung Ahn ; Dae-Yong Son ; In-Hyuk Jang ; Seong Min Kang ; Mansoo Choi ; Nam-Gyu Park
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：July 15, 2015
• 年：2015
• 卷：137
• 期：27
• 页码：8696-8699
• 全文大小：307K
• ISSN：1520-5126

文摘

High efficiency perovskite solar cells were fabricated reproducibly via Lewis base adduct of lead(II) iodide. PbI₂ was dissolved in N,N-dimethyformamide with equimolar N,N-dimethyl sulfoxide (DMSO) and CH₃NH₃I. Stretching vibration of S鈺怬 appeared at 1045 cm^鈥? for bare DMSO, which was shifted to 1020 and 1015 cm^鈥? upon reacting DMSO with PbI₂ and PbI₂ + CH₃NH₃I, respectively, indicative of forming the adduct of PbI₂路DMSO and CH₃NH₃I路PbI₂路DMSO due to interaction between Lewis base DMSO and/or iodide (I^{鈥?/sup>) and Lewis acid PbI₂. Spin-coating of a DMF solution containing PbI₂, CH₃NH₃I, and DMSO (1:1:1 mol %) formed a transparent adduct film, which was converted to a dark brown film upon heating at low temperature of 65 掳C for 1 min due to removal of the volatile DMSO from the adduct. The adduct-induced CH₃NH₃PbI₃ exhibited high charge extraction characteristics with hole mobility as high as 3.9 脳 10鈥? cm2/(V s) and slow recombination rate. Average power conversion efficiency (PCE) of 18.3% was achieved from 41 cells and the best PCE of 19.7% was attained via adduct approach.}