Green-light-selective organic photodiodes for full-color imaging
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Author
Lee, G. H.
Bulliard, X.
Yun, S.
Leem, D. S.
Park, K. B.
Lee, K. H.
et al.
Abstract
In this work, organic photodiodes (OPDs) based on two newly synthesized p-type dipolar small molecules are reported for application to green-light-selective OPDs. In order to reduce the blue-color absorption induced by the use of C60 as the n-type material in a bulk heterojunction (BHJ), the electron donor:electron acceptor composition ratio is tuned in the BHJ. With this light manipulation approach, the blue-wavelength external quantum efficiency (EQE) is minimized to 18% after reducing the C60 concentration in the center part of the BHJ. The two p-type molecules get a cyanine-like character with intense and sharp absorption in the green color by adjusting the strength of their donating and accepting parts and by choosing a selenophene unit as a pi-linker. When combined to C60, the green-wavelength EQE reaches 70% in a complete device composed of two transparent electrodes. Finally, the optical simulation shows the good color-balance performance of hybrid full-color image sensor without an additional filter by using the developed green OPD as the top-layer in stacked device architecture. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Publication Reference
Optics Express, vol. 27 (18), pp. 25410-25419, Sep 2019.
Year
2019