| Citation: | SHAN Zheng-ye, LIU Di, ZHANG Kan, NI Cheng-peng, SUN Jin-fang, CHENG Bin. Study on the effect of non-fullerene doping on the photoelectric properties of planar heterojunction organic photodetectors[J]. Chinese Optics. doi: 10.37188/CO.2025-0114
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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 using a solution process. Characterization techniques including current-voltage measurements, external quantum efficiency, ultraviolet-visible-near-infrared absorption spectroscopy, and photoluminescence spectroscopy were employed, combined with atomic force microscopy to analyze morphological evolution. Experimental results demonstrate that the introduction of IEICO-4F significantly broadens the absorption spectrum 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 increased from 19.17 mA/cm2 to 27.25 mA/cm2, and the specific detectivity improved from 0.78×1012 Jones to 1.45×1012 Jones. Morphological analysis confirmed that IEICO-4F optimizes the phase distribution of PC71BM, forming a finer interpenetrating network structure that facilitates charge transfer and reduces series resistance. The study also revealed 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 photodetector material systems.
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