Superwetting Nanofluids of NiOx-Nanocrystals/CsBr Solution for Fabricating Quality NiOx-CsPbBr3 Gradient Hybrid Film in Carbon-Based Perovskite Solar Cells

Zengyi Wang; Lele Zhang; Xuanling Liu; Lin Ye; Shuang Zhao; Yingyu Chen; Huiyu Yan; Jianhua Han; Hong Lin

doi:10.1002/smtd.202400283

Superwetting Nanofluids of NiO_x-Nanocrystals/CsBr Solution for Fabricating Quality NiO_x-CsPbBr₃ Gradient Hybrid Film in Carbon-Based Perovskite Solar Cells

Small Methods. 2024 May 20:e2400283. doi: 10.1002/smtd.202400283. Online ahead of print.

Authors

Zengyi Wang¹, Lele Zhang², Xuanling Liu³, Lin Ye¹, Shuang Zhao¹, Yingyu Chen¹, Huiyu Yan², Jianhua Han^{1

2}, Hong Lin³

Affiliations

¹ College of Aeronautical Engineering, Civil Aviation University of China, Tianjin, 300300, China.
² College of Science, Civil Aviation University of China, Tianjin, 300300, China.
³ State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.

PMID: 38766885
DOI: 10.1002/smtd.202400283

Abstract

The wettability of precursor solution on substrates is the critical factor for fabricating quality film. In this work, superwetting nanofluids (NFs) of non-stoichiometric nickel oxide (NiO_x) nanocrystals (NCs)-CsBr solution are first utilized to fabricate quality NiO_x-CsPbBr₃ hybrid film with gradient-distributed NiO_x NCs in the upper part for constructing hole transport ladder in carbon-based perovskite solar cells (C-PSCs). As anticipated, the crystalline properties (improved crystalline grain diameters and reduced impurity phase) and hole extraction/transport of the NiO_x-CsPbBr₃ hybrid film are improved after incorporating NiO_x NCs into CsPbBr₃. This originates from the superb wettability of NiO_x-CsBr NFs on substrates and the excellent hole-transport properties of NiO_x. Consequently, the C-PSCs with the structure of FTO/SnO₂/NiO_x-CsPbBr₃/C displays a power conversion efficiency of 10.07%, resulting in a 23.6% improvement as compared with the pristine CsPbBr₃ cell. This work opens up a promising strategy to improve the absorber layer in PSCs by incorporating NCs into perovskite layers through the use of the superwettability of NFs and by composition gradient engineering.

Keywords: CsPbBr3; NiOx nanocrystals; gradient engineering; nanofluids; superwetting.

Abstract

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