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Low dark current inverted organic photodiodes using anionic polyelectrolyte as a cathode interlayer

Title
Low dark current inverted organic photodiodes using anionic polyelectrolyte as a cathode interlayer
Authors
Yoon, Seong WonCho, Jang WhanSim, Kyu MinHa, Ja EunChung, Dae Sung
DGIST Authors
Chung, Dae Sung
Issue Date
2017-02
Citation
Applied Physics Letters, 110(8)
Type
Article
Article Type
Article
Keywords
POLYMER SOLAR-CELLSHIGH-PERFORMANCEEFFICIENCYPHOTODETECTORSHETEROJUNCTIONOPTIMIZATIONBANDGAP
ISSN
0003-6951
Abstract
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).
URI
http://hdl.handle.net/20.500.11750/5659
DOI
10.1063/1.4977025
Publisher
AMER INST PHYSICS
Related Researcher
Files:
There are no files associated with this item.
Collection:
ETC1. Journal Articles


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