In situ growth of perovskite stacking layers for high-efficiency carbon-based hole conductor free perovskite solar cells. Issue 22 (24th May 2019)

• Record Type: Journal Article
• Authors: Liu, Jianhua; Zhou, Qisen; Thein, Nan Kyi; Tian, Lei; Jia, Donglin; Johansson, Erik M. J.; Zhang, Xiaoliang
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 22(2019)
• Page Start: 13777
• Page End: 13786
• Publication Date: 2019-05-24
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9ta02772f
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : An additional perovskite stacking layer is in situ grown on the top of a perovskite layer forming a perovskite stacking structure to improve the interfacial properties at the perovskite/carbon electrode interface. Abstract : The interfacial properties between a perovskite layer and carbon electrode are critical for the photovoltaic performance of carbon electrode-based perovskite solar cells (PSCs). Herein, a methylammonium lead mixed halide (MAPbI x Br3− x ) perovskite layer is in situ grown on the top of a methylammonium lead iodide (MAPbI3 ) perovskite layer forming a MAPbI3 /MAPbI x Br3− x perovskite stacking structure (PSS) to improve the interfacial properties at the perovskite/carbon electrode interface. The charge carrier dynamics in both the perovskite and the PSC device induced by the MAPbI x Br3− x perovskite stacking layer are studied using extensive characterization. The charge interfacial recombination at the perovskite/carbon electrode interface is significantly diminished using the PSS within the PSC, resulting in largely improved charge extraction and therefore high photovoltaic performance. The PSS-based PSC shows a power conversion efficiency of up to 16.2% (increased by 43% compared with that of a conventional MAPbI3 -based PSC), which is among the highest efficiencies of carbon electrode-based hole conductor free PSCs. Meanwhile, the PSS-based PSC also exhibits good stability under both continuous illumination and storage under dark conditions. This work may provide a new avenue to fine tune the interfacial properties of carbon electrode-based PSCs for further improving their photovoltaic performance.