Suppressing Defects-Induced Nonradiative Recombination for Efficient Perovskite Solar Cells through Green Antisolvent Engineering

Wenzhan Xu; Yu Gao; Wenjie Ming; Fang He; Jingzhou Li; Xu-Hui Zhu; Feiyu Kang; Jiangyu Li; Guodan Wei

doi:10.1002/adma.202003965

Suppressing Defects-Induced Nonradiative Recombination for Efficient Perovskite Solar Cells through Green Antisolvent Engineering

Adv Mater. 2020 Sep;32(38):e2003965. doi: 10.1002/adma.202003965. Epub 2020 Aug 7.

Authors

Wenzhan Xu^{1

2}, Yu Gao^{1

2}, Wenjie Ming^{3

4}, Fang He^{1

2}, Jingzhou Li^{1

2}, Xu-Hui Zhu⁵, Feiyu Kang^{1

2}, Jiangyu Li³, Guodan Wei^{1

2}

Affiliations

¹ Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen, 518000, China.
² Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518000, China.
³ Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences, Shenzhen, 518055, China.
⁴ School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, China.
⁵ State Key Laboratory of Luminescent Materials and Devices (SKLLMD), South China University of Technology (SCUT), Guangzhou, 510640, China.

PMID: 32767422
DOI: 10.1002/adma.202003965

Abstract

Organic-inorganic hybrid perovskites have attracted considerable attention due to their superior optoelectronic properties. Traditional one-step solution-processed perovskites often suffer from defects-induced nonradiative recombination, which significantly hinders the improvement of device performance. Herein, treatment with green antisolvents for achieving high-quality perovskite films is reported. Compared to defects-filled ones, perovskite films by antisolvent treatment using methylamine bromide (MABr) in ethanol (MABr-Eth) not only enhances the resultant perovskite crystallinity with large grain size, but also passivates the surface defects. In this case, the engineering of MABr-Eth-treated perovskites suppressing defects-induced nonradiative recombination in perovskite solar cells (PSCs) is demonstrated. As a result, the fabricated inverted planar heterojunction device of ITO/PTAA/Cs_0.15 FA_0.85 PbI₃ /PC₆₁ BM/Phen-NADPO/Ag exhibits the best power conversion efficiency of 21.53%. Furthermore, the corresponding PSCs possess a better storage and light-soaking stability.

Keywords: green antisolvents; nonradiative recombination; perovskite solar cells; power conversion efficiency.

Abstract

Grants and funding