Abstract
We demonstrate the broadband visible organic photodetectors (OPDs) by introducing a non-fullerene acceptor of 3,9-bis(2-methylene-(3-(1,1dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3d:2,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene (ITIC) into the bulk heterojunction (BHJ) based on a conventional system of poly(3-hexylthiophene-2,5-diyl) (P3HT):[6,6]-phenyl C71-butyric acid methyl ester (PC71BM) .The resultant OPDs exhibit a specific detectivity beyond 1012 Jones in the whole visible region ranged from 380 nm to 760 nm, and the highest detectivity reaches 2.67 × 1012 Jones at 710 nm. UV-Vis absorption spectrum, steady-state photoluminescence, atomic force microscopy, and space-charge-limited current property were applied to analyze the film characteristics of obtained OPDs. Owing to the long-wavelength absorption band of ITIC, the spectral photodetection range has been broadened effectively, and better film morphology, more effective energy transfer, and the reduced electron mobility in the active layer are responsible for the excellent photodetection capability. The proposed scheme provides a reliable strategy for implementing high-performance broadband visible OPDs.
Highlights
Visible light, as part of electromagnetic spectrum that can be directly perceived by human vision (380– 780 nm), plays an important role in daily life and industrial production [1]
P3HT, phenyl C71-butyric acid methyl ester (PC71BM), and ITIC were dissolved in chlorobenzene with different mass ratios
The total concentration of these materials was fixed at 30 mg ml−1, and the blend mass ratio of donor (P3HT) and acceptors (PC71BM, ITIC) was fixed at 1:1
Summary
As part of electromagnetic spectrum that can be directly perceived by human vision (380– 780 nm), plays an important role in daily life and industrial production [1]. Visible light remote sensing is the most commonly used in aerial photographic reconnaissance. Color image sensing is mostly based on visible light, etc. As a bridge between the optical signal and electrical signal, photodetector plays an irreplaceable role in the above applications, causing extensive and continuous attention [3]. The research of high-performance visible photodetector is imperative and of great significance. Compared with traditional inorganic photodetectors, organic photodetectors (OPDs) have attracted tremendous attention for applications in
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