Presentation Information
[23p-22C-9]Non-fullerene molecules as additives in the electron transport layer of the tin-lead perovskite solar cells for Voc and stability enhancement
〇(P)Shahrir Razey Sahamir1, Takeru Bessho2, Qing Shen1, Hiroshi Segawa2, Shuzi Hayase1 (1.The Univ of Elec-Com, 2.The Univ of Tokyo)
Keywords:
tin lead perovskite solar cells,Voc enhancement,stability improvement
The improvement in the performance and the stabilities of the tin-lead (SnPb) perovskite solar cells (PSCs) was studied via modification on the electron transport layer (ETL) side of the SnPb PSCs. The conventional structure of the SnPb solar cells would usually employed a fullerene-based phenyl-C61-butyrol methyl ester (PCBM) near the ETL side either as a passivation layer or an ETL. In this study, the non-fullerene electron acceptors are proposed as a partial substitute for PCBM in order to improve the efficiency and the stabilities of the SnPb PSCs. The incorporation of these molecules facilitate the electron injection and minimize the holes concentration near the ETL interface, and yield in higher Voc leading to an efficiency and stability improvement. We observed the Voc of our devices improved significantly (from 0.80 V to 0.89 V) suggesting that the electron injection was better compared to the control devices which employed only PCBM. We are able to minimize Voc loss via this technique and yield an efficiency of more than 22% in our SnPb PSCs. Over 90% retainment of initial efficiency was observed when tested in ambient air stability over 24 hrs at room temperature and also 85 degree Celsius. The long term stability at 85 degree Celsius in the nitrogen air demonstrated no significant change in the efficiency after 500 hours of keeping. Herein we will reveal the mechanism of the degradation and the prevention techniques which could be applied in the Sn based PSCs to accommodate for higher efficiency and long term stability expectation.