ABSTRACT
In this paper, the influence of blend composition and annealing temperature on optical properties of organic photovoltaic (OPV) cells based on P3HT:PCBM interpenetrating blend is presented. Optical optimization of the OPV cell is first performed to determine the optimal geometry of the stack. The studied device structure is: glass/ITO/PEDOT:PSS/P3HT:PCBM/Ca/Al. Simulation results give as optimized thicknesses: dPEDOT:PSS = 27 nm and dActive layer = 91 nm. The optimized OVP cell gives a short-circuit current JSC = 12.48 mA/cm2. The influence of technological parameters on the performance of the optimized P3HT:PCBM blend OPV cell is then clearly defined. Simulation results show that among the mass ratio of P3HT:PCBM blend active layers studied (1:1, 1:2, 2:1, 2:3 and 3:2), the active layer with the higher blend mass ratio (2:1) gives the best optical properties. Also, increasing the annealing temperature of the active layer leads to increase absorption. The blend active layer annealed at 140°C presents the best optical properties of the OPV cell.
Acknowledgments
We would like to thank the deanship of scientific research at Islamic University (Madinah, KSA) for supporting this first (Tamayyouz) program of academic year 2018/2019, research project No.: 1/40. All collaboration works are gratefully acknowledged. The second author Prof. A. Mellit expresses a special acknowledgment to the International Centre for Theoretical Physics (ICTP), Trieste, Italy.