Highly Narrowband Photomultiplication Type Organic Photodetectors.
Filterless narrowband response organic photodetectors (OPDs) present a great challenge due to the broad absorption range of organic semiconducting materials. The reported narrowband response OPDs also suffer from low external quantum efficiency (EQE) in the desired response window and low rejection ratio. Here, we report highly narrowband photomultiplication (PM) type OPDs based on P3HT:PC71BM (100:1, wt/wt) as active layer without an optical filter. The full width at half-maximum (fwhm) of the PM-type OPDs can be well retained less than 30 nm under different biases. Meanwhile, the champion EQE and rejection ratio approach 53 500% and 2020 at -60 V bias, respectively. The small fwhm should be attributed to the sharp absorption edge of active layer with small amount of PC71BM. The PM phenomenon is attributed to hole tunneling injection from the external circuit assisted by trapped electron in PC71BM near the Al electrode under light illumination. These highly narrowband PM-type OPDs should have great potential applications in sensitively detecting specific wavelength light and be blind to light outside of the desired response window.
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University , Beijing 100044, People's Republic of China.
Wenbin
W
Wang
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University , Beijing 100044, People's Republic of China.
Fujun
0000-0003-2829-0735
F
Zhang
National Center for Nanoscience and Technology , Beijing 100190, People's Republic of China.
Mingde
M
Du
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University , Beijing 100044, People's Republic of China.|Department of Mechanical and Materials Engineering and Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln , Lincoln, Nebraska 68588-0656, United States.
Lingliang
L
Li
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University , Beijing 100044, People's Republic of China.
Miao
M
Zhang
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University , Beijing 100044, People's Republic of China.
Kai
K
Wang
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University , Beijing 100044, People's Republic of China.
Yongsheng
Y
Wang
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University , Beijing 100044, People's Republic of China.|Department of Materials Science and Engineering, University of Tennessee , Knoxville, Tennessee 37996, United States.
Bin
B
Hu
National Center for Nanoscience and Technology , Beijing 100190, People's Republic of China.
Ying
0000-0003-2965-7287
Y
Fang
Department of Mechanical and Materials Engineering and Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln , Lincoln, Nebraska 68588-0656, United States.
Jinsong
0000-0002-0509-8778
J
Huang
Organic photodetectors; absorption edge; narrowband response; photogenerated electron distribution; photomultiplication