Defect passivation and crystallization modulation in methylammonium-free wide-bandgap perovskites for all-perovskite tandem solar cells

Jia X, Zhang K, Gao X, Liao X, Yang Y, Li W, Lv X, Zhao X, Liu J, Ji Y, Yan Z, Du Q, Huang F, Ren Z, Zhai Y, Huang W, Bai Y, Yao C, Lin Q, Cheng YB, Tong J (2025)

Publication Type: Journal article

Publication year: 2025

Journal

Science Advances American Association for the Advancement of Science

Book Volume: 11

Pages Range: eadv4501-

Journal Issue: 38

DOI: 10.1126/sciadv.adv4501

Abstract

Wide-bandgap (WBG; >1.65 electron volts) perovskites based on iodine-bromine (I-Br) mixed halides are critical components of perovskite-based tandem solar cells (TSCs). However, the uncontrolled crystallization dynamics of Br-rich species lead to reduced grain sizes and high defect densities in WBG perovskite films. Herein, a multifunctional additive 3,4,5-trifluorobenzamide (TFBZ) was introduced to enhance the crystallinity and passivate defects of the methylammonium (MA)-free WBG perovskite films. The TFBZ demonstrates superior passivation capability compared to benzamide, effectively mitigating both iodine vacancies and undercoordinated Pb2+ defects via fluorine-enhanced interactions. In addition, the fluorine substituents in TFBZ could form N-H···F hydrogen bonds with formamidinium iodide to retard the crystallization rate of the perovskite. This proposed method is effective in defect passivation and crystal growth modulation for both 1.67- and 1.79-electron volt MA-free WBG perovskites, enabling the fabrication of MA-free all-perovskite TSCs with an encouraging power conversion efficiency of 29.01% (certified at 28.52%).

Authors with CRIS profile

Kaicheng Zhang Institute Materials for Electronics and Energy Technology (i-MEET)

Involved external institutions

Hunan Normal University (HNU) / Húnán Shīfàn Dàxué / 湖南师范大学 CN China (CN) Wuhan University of Technology CN China (CN) Shenzhen University of Advanced Technology / 深圳理工大学 CN China (CN) Wuhan University CN China (CN) Hong Kong Polytechnic University (PolyU) CN China (CN) Fudan University / 复旦大学 CN China (CN)

How to cite

APA:

Jia, X., Zhang, K., Gao, X., Liao, X., Yang, Y., Li, W.,... Tong, J. (2025). Defect passivation and crystallization modulation in methylammonium-free wide-bandgap perovskites for all-perovskite tandem solar cells. Science Advances, 11(38), eadv4501-. https://doi.org/10.1126/sciadv.adv4501

MLA:

Jia, Xuefei, et al. "Defect passivation and crystallization modulation in methylammonium-free wide-bandgap perovskites for all-perovskite tandem solar cells." Science Advances 11.38 (2025): eadv4501-.

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