期刊
APPLIED PHYSICS LETTERS
卷 110, 期 8, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4977025
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资金
- Chung-Ang University
- National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2014M1A3A3A02034707]
- National Research Foundation of Korea [2014M1A3A3A02034707] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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 x 10(12) Jones at -5 V. Published by AIP Publishing.
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