Premium
Composition and Interface Engineering for Efficient and Thermally Stable Pb–Sn Mixed Low‐Bandgap Perovskite Solar Cells
Author(s) -
Chi Dan,
Huang Shihua,
Zhang Meiying,
Mu Shaiqiang,
Zhao Yang,
Chen Yong,
You Jingbi
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201804603
Subject(s) - materials science , perovskite (structure) , band gap , pedot:pss , energy conversion efficiency , formamidinium , thermal stability , chemical engineering , tandem , layer (electronics) , perovskite solar cell , tin , optoelectronics , nanotechnology , composite material , metallurgy , engineering
Low bandgap lead–tin (Pb–Sn) mixed perovskite solar cells have achieved high power conversion efficiency in excess of 17%. However, methylammonium (MA) cation is usually contained, and the thermal stability of MA is always a great concern. In this work, according to composition engineering, a nearly formamidinium (FA) based low‐bandgap Pb–Sn mixed perovskite FAPb 0.75 Sn 0.25 I 3 is being tried to explore as the absorber layer. Combined with interface engineering by replacing poly(3,4‐ethylenedioxythiophene)‐polystyrenesulfonic acid (PEDOT:PSS), layer with NiO x as hole transport layer, a power conversion efficiency of 17.25% is obtained. This low‐bandgap perovskite solar cell maintains about 91% of its original efficiency at 80 °C for 20 h, and 92% of its initial performance after 46 days storage at the room temperature. The good thermal stability of nearly FA based low‐bandgap perovskite could be good for delivering efficient and stable perovskite‐perovskite tandem solar cells.