Panchromatic photomultiplication-type organic photodetectors with planar/bulk heterojunction structure

Broadband organic photodetectors (OPDs) can be integrated into various wearable devices and show great application potential in health monitoring and other fields. Here, we demonstrated high-performance broadband photomultiplication-type OPDs (PM-OPDs) based on MoO 3 trapping electron-assisted hole...

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Bibliographic Details
Published in:Science China materials 2023-03, Vol.66 (3), p.1172-1179
Main Authors: Guo, Dechao, Yang, Liqing, Li, Ji, He, Guo, Zheng, Jingbo, Tao, Sizhe, Yang, Dezhi, Wang, Linge, Vadim, Agafonov, Ma, Dongge
Format: Article
Language:English
Subjects:
Absorption
Broadband
Chemistry and Materials Science
Chemistry/Food Science
Heterojunctions
Lead phthalocyanine
Materials Science
Molecular structure
Near infrared radiation
Photometers
Polyethylene terephthalate
Quantum efficiency
Solid phases
Spectral sensitivity
Substrates
Wearable technology
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Summary:Broadband organic photodetectors (OPDs) can be integrated into various wearable devices and show great application potential in health monitoring and other fields. Here, we demonstrated high-performance broadband photomultiplication-type OPDs (PM-OPDs) based on MoO 3 trapping electron-assisted hole tunneling injection mechanism with small-molecule lead (II) phthalocyanine (PbPc) and C 70 fullerene as the donor and acceptor, respectively. In order to control the crystal phase structure formed by PbPc molecules, we prepared PbPc:C 70 bulk heterojunction (BHJ) and PbPc/C 70 planar heterojunction (PHJ) devices. It can be seen that the PHJ device exhibits stronger near-infrared (NIR) absorption characteristics, which is more conducive to the formation of the triclinic phase structure of the PbPc molecule. We further prepared flat panchromatic PM-OPDs in the range of 300–1000 nm by using materials (PbPc and SubPc) with absorption complementary characteristic as the active layers and PHJ/BHJ hybrid heterojunction structure. The external quantum efficiency of the resulting panchromatic PM-OPDs exceeds 1000% in the whole spectral response range under −8 V reverse bias. Finally, we prepared flexible panchromatic PM-OPDs on polyethylene terephthalate substrate and successfully realized the detection of the human pulse signal. This work provides a new strategy for obtaining high-performance panchromatic PM-OPDs by designing device structures and selecting appropriate materials.
ISSN:2095-8226
2199-4501
DOI:10.1007/s40843-022-2241-3