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Low dark current inverted organic photodiodes using anionic polyelectrolyte as a cathode interlayer
- Low dark current inverted organic photodiodes using anionic polyelectrolyte as a cathode interlayer
- Yoon, Seong Won; Cho, Jang Whan; Sim, Kyu Min; Ha, Ja Eun; Chung, Dae Sung
- DGIST Authors
- Chung, Dae Sung
- Issue Date
- Applied Physics Letters, 110(8)
- Article Type
- POLYMER SOLAR-CELLS; HIGH-PERFORMANCE; EFFICIENCY; PHOTODETECTORS; HETEROJUNCTION; OPTIMIZATION; BANDGAP
- We demonstrate the effect of anionic polyelectrolyte as a cathode interlayer to enhance charge selectivity of the electrode/semiconductor junction of organic photodiodes. Poly(styrenesulfonate) (PSS) was used as a cathode interlayer to tune the energy level of an ITO/ZnO electrode, so that hole injection can be minimized while electron extraction can be maximized. Optimized photodiodes with a PSS interlayer showed lower and flatter dark current density curves compared to the reference devices, which implies that tunneling currents at the electrode/active layer interface were dramatically suppressed. Moreover, PSS as an interlayer enabled lower charge recombination yield, as confirmed by the ideality factor and linear dynamic range analysis. As a result, we could realize the near-ideal organic photodiodes with a high performance of specific detectivity up to 3.3 × 1012 Jones at −5 V. © 2017 Author(s).
- AMER INST PHYSICS
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