PBDTTT-CF/PCBM 複合膜を用いた有機薄膜太陽電池の特性評価

Abstract

Solar energy is the most abundant and reliable source of energy and we have to provide for the multi-terawatt challenge we are facing. In recent years organic photovoltaics have become one of the most interesting research areas due to their potential towards a cheap and broad applicability. We report the optical and electrical properties of PBDTTT:PC71BM bulk hetero-junction (BHJ) solar cell. The devices were prepared by spin coating technique with the device structure of Glass/ITO/PEDOT:PSS/Active layer/Al. The ratio of polymer donor and fullerene acceptor varied between 1:1 and 1:4. Optical absorption spectroscopy measurements of the films indicated absorption peaks in the range from 500-800 nm which are attributed to PBDTTT-CF. The surface morphology of the active layers deposited was examined using Atomic Force Microscopy. The current density (J)–voltage (V) characteristics of the PBDTTT: PC71BM bulk hetero-junction solar cells are studied. The devices fabricated using the selective active layer show overall power conversion efficiency of 3%.