Impact of different light induced effect on organic hole-transporting layer in perovskite solar cells

Here, we report two different light sources such as UV-ozone and visible light to treat the graphenePEDOT:PSS [Poly (3, 4-ethylenedioxythiophene):poly (styrenesulfonate)] layer, which acts as an organic hole-transporting layer (HTL) for the CH 3 NH 3 Pbl 3 based semi-transparent perovskite solar cells (PSCs), respectively. The HTL was exposed under the UV-ozone and visible light for 5, 15 and 25 min to understand the effect of different light source and irradiation time on the device's performance, respectively. The optimized 5 min UV-ozone and visible light treated PSCs exhibit a maximum photo-conversion efficiency (PCE) of 7.6% and 11.6%, respectively, which is significantly higher than the untreated PSC (5.17%). This dramatic performance is mainly driven by improvements in the device's short circuit current as well as the fill factor after different light treatment, which actually improves the adhesion between the HTL and CH(3)NH(3)Pbl(3) by rectifying the layer defects. In addition, we also established contact angle measurement as an indirect tool to understand the effect of light treatment on HTL and PCE enhancement, respectively. (C) 2020 Elsevier B.V. All rights reserved.