Effect of Thermal Stress on Power Conversion Efficiency of PCDTBT:PC71BM Organic Solar Cells
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.
Authors wish to thank UGC, India and MNRE, India for the financial assistance. Authors also wish to thank University of Delhi and Amity University, Noida for providing infrastructure and the facilities to carry out the research.
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