High-Efficiency Perovskite Solar Cells Enabled by Guanylation Reaction for Removing MACl Residual and In-Situ Forming 2D Perovskite

Zhuang Xie; Yuwei Duan; Minghui Cheng; Yong Li; Zhike Liu; Hongxiang Li; Yu Chen; Zhigang Zang; Shengzhong Liu; Qiang Peng

doi:10.1002/anie.202419070

High-Efficiency Perovskite Solar Cells Enabled by Guanylation Reaction for Removing MACl Residual and In-Situ Forming 2D Perovskite

Angew Chem Int Ed Engl. 2024 Dec 5:e202419070. doi: 10.1002/anie.202419070. Online ahead of print.

Authors

Zhuang Xie¹, Yuwei Duan¹, Minghui Cheng¹, Yong Li², Zhike Liu², Hongxiang Li³, Yu Chen⁴, Zhigang Zang⁵, Shengzhong Liu⁶, Qiang Peng⁷

Affiliations

¹ Chengdu University of Technology, College of Materials and Chemistry & Chemical Engineering, No. 1, East Third Road, Erxianqiao, Chenghua District, 610059, Chengdu, CHINA.
² Shaanxi Normal University, Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Xi'an, CHINA.
³ Sichuan University, College of Polymer Science and Engineering, CHINA.
⁴ Chengdu University of Technology, College of Materials and Chemistry & Chemical Engineering, No. 1, East Third Road, Erxianqiao, Chenghua District, 610059, Chnegdu, CHINA.
⁵ Chongqing University, Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education, CHINA.
⁶ Shaanxi Normal University, Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education, Xi'an, CHINA.
⁷ Sichuan University, School of Chemical Engineering, No.24 South Section 1, Yihuan Road, 610065, Chengdu, CHINA.

PMID: 39639433
DOI: 10.1002/anie.202419070

Abstract

The thermodynamical deprotonation of methylammonium chloride (MACl) has several detrimental influences on the quality of formamidinium (FA+)-based perovskite, which limits both efficiency and stability of inverted perovskite solar cells (IPSCs). Herein, a new additive strategy was developed by introducing methyl carbamimidothioate hydroiodide (MCH) into perovskite precursor, where guanylation reaction occurred between MCH and MACl to form a new intermediate of methyl-substituted guanidine (MSG). MSG could then bond with undercoordinated Pb2+ to in-situ form a two-dimensional (2D) perovskite, which would promote the growth and crystallization of three-dimensional (3D) perovskite with higher crystallinity, lower defect-states density and superior stability. Finally, the MCH-treated IPSC with a small area (0.09 cm2) achieved an impressive power conversation efficiency (PCE) of 26.81% (certified as 26.02%), which is one of the highest PCEs reported to date. The large area MCH-treated device (1.00 cm2) also obtained a high PCE of 24.36%. Moreover, the unencapsulated and MCH-treated device exhibited excellent operational stability, maintaining 91.95% and 97.06% of their initial efficiencies after aging in air and a nitrogen-filled atmosphere at 85 oC for 1200 h. The encapsulated MCH-treated devices retained 94.25% of its initial efficiency after continuously tracking at the maximum power-point for 1200 h in air.

Keywords: Growth and crystallization; Guanylation reaction; Methylammonium chloride residual; Two-dimensional perovskite; inverted perovskite solar cells.