Unveiling the Role of Fluorination in Suppressing Dark Current and Enhancing Photocurrent to Enable Thick-Film Near-Infrared Organic Photodetectors.

ABSTRACT: Thick active layers are crucial for scalable production of organic photodetectors (OPDs). However, most OPDs with active layers thicker than 200 nm typically exhibit decreased photocurrents and responsivities due to exciton diffusion and prolonged charge transport pathways. To address these limitations, we designed and synthesized PFBDT-8ttTPD, a fluorinated polymer donor. The strategic incorporation of fluorine effectively enhanced the charge carrier mobility, enabling more efficient charge transport, even in thicker films. OPDs combining PFBDT-8ttTPD with IT-4F or Y6 non-fullerene acceptors showed a substantially lower dark current density (J_d) for active layer thicknesses of 250-450 nm. Notably, J_d in the IT-4F-based devices declined from 8.74 × 10

SUBMITTER: Bai Y 

PROVIDER: S-EPMC12526977 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature