Amino‐Linked Conjugated Tetrazole Ring Passivation Strategy for Air‐Processed Perovskite Cells with Predominant Stability and Efficiency. Issue 2 (9th December 2021)

• Record Type: Journal Article
• Authors: Deng, Yaxin; Zhang, Hongxia; Li, Xin; Wang, Rui
• Is Part Of: ChemSusChem. Volume 15:Issue 2(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-09
• Subjects: 5-aminotetrazole -- ambient conditions -- passivator -- perovskites -- solar cells; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.202101965
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: Perovskite solar cells (PSCs) develop rapidly with certified efficiency over 25.5 %, but there are remaining problems such as defects‐induced recombination and degradation throughout the whole device. Functional organic small molecule passivation strategies are diverse and efficient, enhancing the efficiency and stability of PSCs. Here, 5‐aminotetrazole (5ATZ) was introduced for the first time as an effective passivator, where −NH2 and −NH as active sites interacted with the Pb and I related to vacancy defects in perovskites, anchoring defects and preventing further unavoidable ion migration and device degradation. Furthermore, the extensive π‐electron delocalization around the tetrazole conjugated ring significantly promoted the charge transfer. Therefore, the 5ATZ‐processed PSCs provided enhanced voltage and current, showed superior 19.75 % power conversion efficiency with excellent performance and improved stability, and demonstrated one of the best performances in all‐air preparation to date. The simultaneous multi‐effect passivation strategy of vacancy defects in perovskites will contribute to eliminate obstacles on the road to commercialization of PSCs. Abstract : A passive approach : 5‐Aminotetrazole (5ATZ) is introduced for the first time as an effective passivator for perovskite solar cells (PSCs), anchoring defects and preventing further unavoidable ion migration and device degradation. Extensive π‐electron delocalization around the tetrazole conjugated ring significantly promotes charge transfer. 5ATZ‐processed PSCs provide enhanced voltage and current with excellent performance and improved stability.