期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 9, 期 1, 页码 8-12出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.7b02918
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资金
- Space Core Technology Development Program
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2014M1A3A3A02034707, NRF-2015R1C1A1A02037219]
A thin film planar heterojunction organic photodetector (PHJ-OPD) is demonstrated. Different from a conventional sensitizer-doped photodetector, the limited spatial distribution of sensitizer in a PHJ-OPD enables significantly reduced thickness of the active layer without allowing the formation of unnecessary trap sites and electron percolation pathways. As a result, peak external quantum efficiency (EQE) of 120 700% and detectivity over 10(13) Jones are demonstrated with thin active layer thickness of 150 nm, which can be a significant benefit for high-resolution image sensor application. Furthermore, the operating voltage can be decreased to -5 V while maintaining high detectivity over 10(12) Jones. Remarkable thermal stability is also observed with minor change in detectivity for 2 h of continuous operation at 60 degrees C due to morphological robustness of PHJ. This work opens up a possibility of using a thin film PHJ-OPD as a key unit of high-resolution image sensor.
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