非富勒烯掺杂对平面异质结有机光电探测器的光电特性影响OA

This study investigates the impact of doping the non-fullerene small molecule IEICO-4F into the acceptor component of a planar heterojunction organic photodetector based on the P3HT:PC71BM system on the device's optoelectronic properties.The active layer films with different doping ratios were fabricated us-ing a solution process.Characterization techniques including current-voltage measurements,external quantum efficiency,ultraviolet-visible-near-infrared absorption spectroscopy,and photoluminescence spec-troscopy were employed,combined with atomic force microscopy to analyze morphological evolution.Ex-perimental results demonstrate that the introduction of IEICO-4F significantly broadens the absorption spec-trum of the active layer into the near-infrared region(700-900 nm)and enhances photon capture efficiency through complementary absorption spectrum.At an optimized doping ratio of 30％,the device's photocurrent density increases from 19.17 mA/cm2 to 27.25 mA/cm2,and the specific detectivity improves from 0.78× 1012 Jones to 1.45×1012 Jones.Morphological analysis confirms that IEICO-4F optimizes the phase distribu-tion of PC71BM,forming a finer interpenetrating network structure that facilitates charge transfer and re-duces series resistance.The study also reveals that excessive doping disrupts the phase separation balance,adversely affecting carrier separation and transport,leading to an imbalance in electron-hole transport.This work highlights the multifaceted regulatory effect of non-fullerene acceptor doping on traditional polymer:fullerene systems,effectively enhancing device performance through the synergistic mechanisms of spectral broadening and morphological optimization,thereby providing new insights for the design of organic photo-detector material systems.