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Spatial Confinement of the Optical Sensitizer to Realize a Thin Film Organic Photodetector with High Detectivity and Thermal Stability
- Spatial Confinement of the Optical Sensitizer to Realize a Thin Film Organic Photodetector with High Detectivity and Thermal Stability
- Jang, Min Su; Yoon, Seong Won; Sim, Kyu Min; Cho, Jang Whan; Chung, Dae Sung
- DGIST Authors
- Chung, Dae Sung
- Issue Date
- Journal of Physical Chemistry Letters, 9(1), 8-12
- Article Type
- Heterojunctions; Image sensors; Photodetectors; Photons; Solvents; Thermodynamic stability; Active Layer; Continuous operation; External quantum efficiency; High resolution image; Operating voltage; Organic photodetector; Sensor applications; Spatial confinement; Thin films
- 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.
- American Chemical Society
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