Facile Synthesized Acetamidine Thiocyanate with Synergistic Passivation and Crystallization for Efficient Perovskite Solar Cells. Issue 12 (17th October 2022)

• Record Type: Journal Article
• Authors: Wang, Xinxin; Huang, Hao; Du, Shuxian; Cui, Peng; Lan, Zhineng; Yang, Yingying; Yan, Luyao; Ji, Jun; Liu, Benyu; Qu, Shujie; Zhang, Qiang; Yue, Xiaopeng; Zhao, Xing; Li, Meicheng
• Is Part Of: Solar RRL. Volume 6:Issue 12(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-17
• Subjects: acetamidine thiocyanate -- dual-functional material design -- perovskite solar cells -- recombination losses suppressing; Solar energy -- Periodicals; Photovoltaic power generation -- Periodicals; Solar energy -- Research -- Periodicals; Photovoltaic power generation -- Research -- Periodicals; Periodicals; 333.7923
• DOI: 10.1002/solr.202200717
• Languages: English
• ISSNs: 2367-198X

Abstract

Abstract : Further performance enhancement of perovskite solar cells (PSCs) is limited by the defect‐assisted recombination losses. The approaches employed to decrease the losses contain defect passivation, perovskite crystallization control, interface engineering, etc. Herein, a new material of acetamidine thiocyanate (AASCN) via a facile method is synthesized, which exhibits dual functions combining a cation with passivation and an anion with crystallization. The iodine vacancies in the perovskite can be effectively passivated through hydrogen bonds formed by the NH bonds of the polar cation AA + . Furthermore, the pseudo‐halide anion SCN − can coordinate the Pb–I octahedrons, improving the perovskite film crystallization. Through vaporing the AASCN on perovskite films during the secondary crystal growth process, the defects mitigation and crystallization improvement are synergistically achieved. As a consequence, the FA0.25 MA0.75 PbI3 PSCs with AASCN achieve a power conversion efficiency of 23.17%, which is higher than that (21.43%) of untreated PSCs. In detail, the open‐circuit voltage has also a significant advancement from 1.095 to 1.167 V after the AASCN treatment. The design and synthesization of the multifunctional materials are supposed to provide a feasible approach for the performance improvement of PSCs. Abstract : A novel material of acetamidine thiocyanate (AASCN) has been designed and synthesized to functionalize on perovskite films, which synergistically improves crystallization and passivates surface defects, leading to an improved power conversion efficiency from 21.43% to 23.17%.