In Situ Interface Engineering for Highly Efficient Electron-Transport-Layer-Free Perovskite Solar Cells

Deli Li, Lingfeng Chao, Changshun Chen, Xueqin Ran, Yue Wang, Tingting Niu, Shaoshen Lv, Hui Wu, Yingdong Xia, Chenxin Ran, Lin Song, Shi Chen, Yonghua Chen, Wei Huang

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83 引用 (Scopus)

摘要

Electron-transport-layer free perovskite solar cells (ETL-free PSCs) have attracted great attention due to their low cost and simple manufacturing process. However, an additional interface layer has to be introduced, and the currently achieved efficiency remains far from full-structure PSCs. Here, we report an in situ interface engineering strategy by the methylammonium acetate (MAAc) ionic liquid perovskite precursor. We found that a dipole layer was in situ constructed through the physical adsorption of the residual MAAc polar molecules on the indium tin oxide electrode, which is significantly different from the treatment by the interface layer in previous reports. This allows a decrease of the effective work function and enables in situ band bending in the perovskite semiconductor. The in situ band bending facilitates charge collection and hinders interfacial charge recombination, leading to ETL-free PSCs with a maximum power conversion efficiency of 21.08%, which is the highest report to date.

源语言英语
页(从-至)5799-5806
页数8
期刊Nano Letters
20
8
DOI
出版状态已出版 - 12 8月 2020

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