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Spatial Confinement of the Optical Sensitizer to Realize a Thin Film Organic Photodetector with High Detectivity and Thermal Stability

Title
Spatial Confinement of the Optical Sensitizer to Realize a Thin Film Organic Photodetector with High Detectivity and Thermal Stability
Authors
Jang, Min SuYoon, Seong WonSim, Kyu MinCho, Jang WhanChung, Dae Sung
DGIST Authors
Chung, Dae Sung
Issue Date
2018-01
Citation
Journal of Physical Chemistry Letters, 9(1), 8-12
Type
Article
Article Type
Article
Keywords
HeterojunctionsImage sensorsPhotodetectorsPhotonsSolventsThermodynamic stabilityActive LayerContinuous operationExternal quantum efficiencyHigh resolution imageOperating voltageOrganic photodetectorSensor applicationsSpatial confinementThin films
ISSN
1948-7185
Abstract
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 1013 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 1012 Jones. Remarkable thermal stability is also observed with minor change in detectivity for 2 h of continuous operation at 60 °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. © 2017 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/5601
DOI
10.1021/acs.jpclett.7b02918
Publisher
American Chemical Society
Related Researcher
Files:
There are no files associated with this item.
Collection:
ETC1. Journal Articles


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