Open AccessGreen-light-selective organic photodiodes for full-color imaging
Author(s) -
Gae Hwang Lee,
Xavier Bulliard,
Sungyoung Yun,
DongSeok Leem,
Kyung-Bae Park,
Kwang-Hee Lee,
ChulJoon Heo,
InSun Jung,
Jung-Hwa Kim,
Yeong Suk Choi,
Seon-Jeong Lim,
Yong Jin
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.025410
Subject(s) - materials science , photodiode , optoelectronics , optics , quantum efficiency , color gel , cyanine , absorption (acoustics) , layer (electronics) , fluorescence , nanotechnology , physics , composite material , thin film transistor
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 π-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.