Improvement of charge carrier dynamics in P3HT:PC61BM based solar cell in presence of organic cathode interfacial layers

Here, we incorporated different organic interfacial layers in P3HT:PC6iBM based solar cells, namely, Alq3, BPhen and BCP with Al cathode and there photovoltaic performances were investigated and compared with the conventional structure. It was observed that the device with ITO/PEDOT: PSS/P3HT:PC₆₁BM/BCP/Al configuration showing the best performance having PCE, η=4.5% with J_sc=12.67 mA/cm², V_oc= 0.58 V and FF=62% compared to the other due to the better hole-blocking capacity of BCP/Al with the active layer. These results systematically explain the role and contribution of different organic interfacial layers to the PCE and the overall device performance of P3HT:PC₆₁BM based BHJ solar cell.