Abstract
The effect of different anodic buffer layers on power conversion efficiency of small molecular photovoltaic devices based on CuPc/C60 heterojunction was investigated. The enhanced performance of cells can be attributed to the substitution of a double anode buffer layer system PEDOT:PSS/LiF and MoO3/LiF instead of single PEDOT:PSS. The greatest improvement in device efficiency was achieved by using the double anodic buffer layer system MoO3/LiF. A metal–insulator–semiconductor model is used here to explain the mechanisms of this anodic buffer layer system. Also, the thickness of MoO3 buffer layer was optimized to achieve better power conversion efficiency. It is demonstrated that the best results are achieved with a 6 nm thickness of MoO3 (η = 3%) which exhibits a power conversion efficiency of 1.26% higher than that of the cell with PEDOT:PSS/LiF (η = 1.74%).
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