High-Purity Inorganic Perovskite Films for Solar Cells with 9.72 % Efficiency

Jialong Duan; Yuanyuan Zhao; Benlin He; Qunwei Tang

doi:10.1002/anie.201800019

High-Purity Inorganic Perovskite Films for Solar Cells with 9.72 % Efficiency

Angew Chem Int Ed Engl. 2018 Mar 26;57(14):3787-3791. doi: 10.1002/anie.201800019. Epub 2018 Feb 27.

Authors

Jialong Duan^{1

2}, Yuanyuan Zhao^{1

2}, Benlin He², Qunwei Tang^{1

3}

Affiliations

¹ Institute of New Energy Technology, College of Information Science and Technology, Jinan University, Guangzhou, 510632, P. R. China.
² School of Materials Science and Engineering, Ocean University of China, Qingdao, 266100, P. R. China.
³ Joint Laboratory for Deep Blue Fishery Engineering, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, P. R. China.

PMID: 29380514
DOI: 10.1002/anie.201800019

Abstract

All-inorganic perovskite solar cells with high efficiency and improved stability are promising for commercialization. A multistep solution-processing method was developed to fabricate high-purity inorganic CsPbBr₃ perovskite films for use in efficient solar cells. By tuning the number of deposition cycles (n) of a CsBr solution, the phase conversion from CsPb₂ Br₅ (n ≤3), to CsPbBr₃ (n=4), and Cs₄ PbBr₆ (n≥5) was optimized to achieve vertical- and monolayer-aligned grains. Upon interfacial modification with graphene quantum dots, the all-inorganic perovskite solar cell (without a hole-transporting layer) achieved a power conversion efficiency (PCE) as high as 9.72 % under standard solar illumination conditions. Under challenging conditions, such as 90 % relative humidity (RH) at 25 °C or 80 °C at zero humidity, the optimized device retained 87 % PCE over 130 days or 95 % over 40 days, compared to the initial efficiency.

Keywords: all-inorganic perovskite solar cells; charge extraction; charge recombination; multistep deposition; stability.

Publication types

Research Support, Non-U.S. Gov't