Photomultiplication Type Broad Response Organic Photodetectors with One Absorber Layer and One Multiplication Layer

Abstract

Broad response organic photodetectors (OPDs) with a photomultiplication (PM) effect are achieved with one absorber layer and one multiplication layer. The response range of the PM-OPDs is primarily determined by materials in the absorber layer, and the external quantum efficiency (EQE) of the PM-OPDs is mainly controlled by the multiplication layer. Here, double-layered PM-OPDs were designed with an ITO/ZnO/PM6:Y6/PC71BM:P3HT (100:5, w/w)/Au structure, where PM6:Y6 is employed as an absorber layer and PC71BM:P3HT is used as a multiplication layer. The optimal PM-OPDs exhibit a broad response covering 350–950 nm. Meanwhile, the optimal PM-OPDs exhibit the largest EQE value of ∼1200% and a maximum specific detectivity (D*) of ∼6.8 × 10–12 cm Hz1/2 W–1 under a 10 V bias. This double-layered approach may be a smart strategy for realizing PM-OPDs with an easily adjustable response range.

Alloy-like ternary polymer solar cells with over 17.2% efficiency

“…The light field distribution of cells and photogenerated exciton distribution in active layers were calculated according to transfer matrix method and are exhibited in Fig. S6 (online) [46][47][48][49]. The detailed calculation processes are described in the Supplementary materials.…”

Over 15.7% Efficiency of Ternary Organic Solar Cells by Employing Two Compatible Acceptors with Similar LUMO Levels

“…[ 1–7 ] It is well known that the sufficient photon harvesting is prerequisite to obtain efficient OSCs. [ 8,9 ] In fact, organic semiconducting materials have a relatively narrow photon harvesting range with full width at half maximum about 100 nm, leading to the limited photon harvesting of active layers containing one donor material and one acceptor material. [ 10,11 ] Ternary strategy with two donors or two acceptors was proposed to improve photon harvesting of ternary active layers as much as possible.…”

Recent Progress on Broadband Organic Photodetectors and their Applications

“…[35,52] The difference between J L and J d is the photogenerated current density (J ph ) for PD-OPDs, or photo-induced current density (J pi ) for PM-OPDs, which mainly originates from charge tunneling injection. [18,19,53]…”

“…[4] In the past two decades, solution-processed organic photodetectors (OPDs) have drawn much more attentions owing to their inherent advantages over the inorganic counterparts, such as solution and largearea processability, mechanical flexibility, light weight, room operating temperature, and low costs, which compensate well for the drawbacks of commercial inorganic photodetectors. [15][16][17][18][19][20] The response spectral range of OPDs is primarily determined by the photon harvesting range of the organic semiconductors in active layers. [21][22][23][24][25] The OPDs can be classified as broadband OPDs and narrowband OPDs in light of the bandwidth of photoresponse.…”