Evaluation of the characteristics of the organic thin film solar cell fabricated by poly [4,8-bis(2-ethylhexyloxy)-benzo[1,2-b:4,5-b']dithiophene-2,6-diyl-alt-(4-octanoyl-5-fluoro-thieno[3,4-b]thiophene-2-carboxylate)-2,6-diyl] (PBDTTT-CF)/ [6,6]-phenyl- C71-butyric acid methyl ester (PCBM)

초록

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%.