Optimizing the performance of P3HT-based photodetector by tuning the composition of OXCBA

Abstract In this study, the performance of organic-based photodetectors using poly(3-hexylthiophene) (P3HT) and o-xylenyl-C60-bisadduct (OXCBA) as the donor and acceptor material, respectively, is reported. Four different ratios of 1:0.25, 1:0.50, 1:1.00 and 1:1.50 of P3HT:OXCBA binary blended thin films are used as photoactive layers for organic photodetectors. Optimizing the ratio of photoactive layers dramatically enhances the performance of photodetectors, with rise and decay time of 445 and 309 ms, respectively, are recorded from 1:0.50 ratio. The responsivity of the optimized device is 252.69 mA/W while its specific detectivity is 1.85 × 101°Jones at −1 V, and has shown good stability for over 336 h. External quantum efficiency of 52.77 % and low surface roughness of 0.596 nm are obtained from the 1:0.50 P3HT:OXCBA device. These results imply a high detection potential of P3HT:OXCBA-based photodetector.