A comparative study of Perylene derivatives in organic bulk heterojunction solar cells

Abstract

Perylene derivative were used as electron acceptor in non-fullerene organic solar cells using the structure of ITO/PEDOT:PSS/PCDTBT:Acceptor/TiO x /Al. Using a new perylene structure, PCDTBT:Perylene diimide photoactive device showed a low power conservation efficiency (PCE), compared to a PCDTBT:PC 70 BM photoactive device. This result has been observed in reduced short circuit current (I sc ) and open circuit voltage (V oc ). The devices with electron acceptors as bis-perylene diimide-1 and bis-perylene diimide-2 all showed excellent efficiency of 0.27%, with weight ratio of PCDTBT:acceptor (1:2). In addition, the morphologies and optical properties of PCDTBT:acceptor thin films were investigated. The high roughness and low absorbance due to the perylene derivatives were consistent with the low efficiency of solar cells.