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 other fields. Here, we demonstrated high-performance broadband photomultiplication-type OPDs (PM-OPDs) based on MoO3 trapping electron-assisted hole tunneling injection mechanism with small-molecule lead (II) phthalocyanine (PbPc) C70 fullerene as the donor acceptor, respectively. In order to control crystal phase structure formed by PbPc molecules, prepared PbPc:C70 bulk heterojunction (BHJ) PbPc/C70 planar (PHJ) devices. It seen that PHJ device exhibits stronger near-infrared (NIR) absorption characteristics, which is more conducive formation of triclinic molecule. We further flat panchromatic PM-OPDs range 300–1000 nm using materials (PbPc SubPc) complementary characteristic active layers PHJ/BHJ hybrid structure. The external quantum efficiency resulting exceeds 1000% whole spectral response under −8 V reverse bias. Finally, flexible polyethylene terephthalate substrate successfully realized detection human pulse signal. This work provides a new strategy for obtaining designing structures selecting appropriate materials.