Bidentate Anchoring Enables Concurrent Grain Orientation and Lattice Strain Mitigation in Wide-Bandgap Perovskites for High-Performance All-Perovskite Tandem Solar Cells

Bibliographische Detailangaben
Veröffentlicht in:	Advanced materials (Deerfield Beach, Fla.). - 1998. - (2025) vom: 14. Okt., Seite e13281
1. Verfasser:	Jin, Mingjing (VerfasserIn)
Weitere Verfasser:	Xi, Chenpeng, Chen, You, Yuan, Wenbin, Zeng, Miao, Yan, Zhongliang, Yang, Xueying, Luo, Chuanyao, Wang, Zhaojin, Huang, Arui, Xu, Xiaowei, Yan, Chang, Kyaw, Aung Ko Ko, Tong, Jinhui, Chen, Shi, Zhang, Wen-Hua, Xiao, Zhengguo, Yang, Guang, Wu, Tom, Bai, Yang
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2025
Zugriff auf das übergeordnete Werk:	Advanced materials (Deerfield Beach, Fla.)
Schlagworte:	Journal Article oriented crystallization strain relaxation tandem solar cells wide‐bandgap perovskite

Beschreibung
Zusammenfassung:	© 2025 Wiley‐VCH GmbH. Wide-bandgap perovskite solar cells (WBG-PSCs) are essential for high-performance all-perovskite tandem solar cells. However, their efficiency and stability are limited by inhomogeneous crystallization, which induces disordered crystal orientation and detrimental lattice strain. Herein, malondiamidine hydrochloride (MAMCl) is introduced as a new ligand that simultaneously controls crystal nucleation orientation and passivates grain boundaries in WBG perovskites while relieving lattice strain. MAMCl's unique molecular structure - featuring amide and amidine terminal groups connected by a short carbon chain, exhibits strong binding affinity with lead ions, promoting preferential (100)-oriented nucleation. The ligand's compact molecular structure, devoid of sterically hindering groups, facilitates charge extraction and transport at the perovskite/charge transport layer interface. During thermal processing, MAMCl preferentially anchors at grain boundaries through strong coordination bonding, effectively mitigating lattice strain and enhancing thermal stability. As a result, single-junction 1.77 eV WBG-PSCs achieve a champion power conversion efficiency (PCE) of 20.4% with an exceptional open-circuit voltage (VOC) of 1.369 V. When incorporated into tandem devices, a high PCE of 29.0% (certified 28.06%) is obtained. Notably, the encapsulated all-perovskite tandem devices retain 93% of initial efficiency after 700 h and over 80% after 1320 h of continuous maximum power point tracking (MPPT) under 1-sun illumination in ambient conditions
Beschreibung:	Date Revised 14.10.2025 published: Print-Electronic Citation Status Publisher
ISSN:	1521-4095
DOI:	10.1002/adma.202513281