Article

Solvent Engineering for Ambient-Air-Processed, Phase-Stable CsPbI<sub>3</sub> in Perovskite Solar Cells

Paifeng LuoDepartment of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009, People’s Republic of ChinaWei XiaDepartment of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009, People’s Republic of ChinaShengwen ZhouDepartment of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009, People’s Republic of ChinaLin SunDepartment of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009, People’s Republic of ChinaJigui ChengDepartment of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009, People’s Republic of ChinaChenxi XuDepartment of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009, People’s Republic of ChinaYingwei LuDepartment of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009, People’s Republic of China

2016en

ABI

Abstract

Inorganic CsPbI3 perovskite solar cells (PSCs) owning comparable photovoltaic performance and enhanced thermal stability compared to organic-inorganic hybrid perovskites have attracted enormous interest in the past year. However, it is still a challenge to stabilize the desired black α-CsPbI3 perovskites in ambient air for photovoltaic applications. Herein, sequential solvent engineering including the addition of hydroiodic acid (HI) and subsequent isopropanol (IPA) treatment for fabricating stable and working CsPbI3 PSCs is developed, and a novel low-temperature phase-transition route from new intermediate Cs4PbI6 to stable α-CsPbI3 is also released for the first time. As such, the as-prepared PSCs give a relatively high power conversion efficiency (PCE) of 4.13% (reverse scan), and the steady-state power output of 1.88% is confirmed for the selected cell with an initial PCE of 3.13%. To the best of our knowledge, this is the first demonstration of fabricating CsPbI3 inorganic PSCs under fully open-air conditions.

Identifiers

DOI: 10.1021/acs.jpclett.6b01576

Citations and references

Cited by 30 references

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