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The mechanism of photogenerated minority carrier movement in organic phototransistors
- Source :
- Journal of Materials Chemistry C. 8:12284-12290
- Publication Year :
- 2020
- Publisher :
- Royal Society of Chemistry (RSC), 2020.
-
Abstract
- The acceptor phase, which affects the free carrier transport by trapping the photogenerated minority carrier in the active layer, plays an important role in organic phototransistors (OPTs) based on a bulk heterojunction (BHJ). In this work, the FBT-Th4(1,4):PC61BM blend film with high mobility is selected as the active layer to construct the OPT. A model of the action of minority carrier movement on hole transmission is established by using the change rule of device performance under different donor/acceptor ratios. This model is tested and validated using PTB7:PC61BM-based OPT with low mobility. The results show that a continuous transmission channel of photogenerated minority carrier tends to form in the OPT under high concentration doping, which increases the probability that a minority carrier would recombine with the holes, leading to poor device performance. These results can provide practical guidance for the preparation of high-performance OPT devices. The optimized FBT-Th4(1,4) : PC61BM device with a low D/A ratio (∼10 : 1) obtained shows ultrahigh photoelectric detection performance (gain = 4.7 × 105, D* = 1.4 × 1016 Jones).
Details
- ISSN :
- 20507534 and 20507526
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Chemistry C
- Accession number :
- edsair.doi...........0dc53a505fcffd1effc6863e4ae9432c
- Full Text :
- https://doi.org/10.1039/d0tc02698k