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Cavity Enhanced Organic Photodiodes with Charge Collection Narrowing
Advanced Optical Materials, Start page: 1801543
Swansea University Author: Ardalan Armin
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DOI (Published version): 10.1002/adom.201801543
Color discrimination in photodetection is conventionally achieved using broadband-absorbing inorganic semiconductors with passive optical filters. Organicsemiconductors show promise to deliver narrowband spectral responses dueto their tunable optical properties. While achieving narrow-absorbing orga...
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Color discrimination in photodetection is conventionally achieved using broadband-absorbing inorganic semiconductors with passive optical filters. Organicsemiconductors show promise to deliver narrowband spectral responses dueto their tunable optical properties. While achieving narrow-absorbing organicsemiconductors is an ongoing endeavor in the synthetic chemistry community,charge collection narrowing is introduced as a “material-agnostic” techniqueto realize narrowband spectral responses using broadband absorberssuch as blends of organic semiconductors, inorganic nanocrystals, and perovskitesin a photodiode architecture. Charge collection narrowing in organicsemiconductors demands photoactive junction thicknesses on the order ofa few micrometers causing fabrication difficulties and limitations in devicemetrics such as frequency bandwidth. In this work it is shown that electricalinversion can result in charge collection narrowing in organic photodiodeswith active layer thicknesses on the order of hundreds of nanometers and hencemuch easier to achieve via high throughput solution processing techniques.Additionally, it is shown that an indium tin oxide/gold electrode with modifiedwork function acts as a cavity mirror, further narrowing the spectral responseand at the same time delivering an extremely selective cathode, suppressingthe dark current dramatically. Nearly voltage independent detectivities of 1013Jones are achieved with an active sensing area of 0.2 cm2.
Faculty of Science and Engineering