Abstract
The effect of thermal stress on poly[N-900-hepta-decanyl-2,7-carbazole-alt-5,5-(40,70-di-2-thienyl-20,10,30-benzothiadiazole)] (PCDTBT):[6,6]-phenyl C71-butyric acid methyl ester (PC71 BM) composite films based organic solar cells has been examined. The optical absorption spectra of PCDTBT:PC71BM composite shows that absorption remains almost unchanged till ~150 °C. However, the absorption peak falls by more than 30% for the film annealed at 200 °C. It has also been observed that photoluminescence (PL) of the PCDTBT:PC71BM composite films is best quenched by an order of magnitude at an annealing temperature of 150 °C showing a significant transfer of electrons from donor to acceptor. The maximum photo conversion efficiency (PCE) of the solar cell has been found to increase significantly (from 0.51 to ~2.25%) for sample annealed at 150 °C and beyond that it starts decreasing.
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