Stable perovskite solar cells using thiazolo [5,4-d]thiazole-core containing hole transporting material

Abstract

This work explains the synthesis of an efficient organic hole transporting material based on 4,4′-(5,5′-(thiazolo[5,4-d]thiazole-2,5-diyl)bis(furan-5,2-diyl))bis(N,N-diphenylaniline) (TP-FTzF-TP) and the replacement of poly(3,4-ethylenedio-xythiophene): poly(styrenesulfonate) (PEDOT:PSS) layer by simple O2 plasma treatment for perovskite solar cells (PSCs). The introduction of furan spacer groups significantly tuned the absorption and the electrochemical properties of the organic hole transporting material. The ITO(O2 plasma)/TP-FTzF-TP/CH3NH3PbI3/PC61BM/Au configuration based PSC exhibited a high power conversion efficiency (PCE) of ~ 16.4% which showed a momentous improvement as compared to PCEs of ~ 11.6% and ~ 10.5% achieved by ITO/PEDOT:PSS/TP-FTzF-TP/CH3NH3PbI3/PC61BM/Au and ITO/TP-FTzF-TP/CH3NH3PbI3/PC61BM/Au devices, respectively. The superior performances of PSC were accredited to fast hole injection from the valence band of CH3NH3PbI3 into the suitable HOMO and a high hole mobility of TP-FTzF-TP HTM.