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A new method for realizing the response broadening of organic photodetectors (OPDs) using non-fullerene acceptor IEICO-4F doping has been proposed in this paper. It was found that when the mass ratio of P3HT:IEICO-4F:PC 61 BM in the active layer was 10:2:8, the spectral response range of OPDs was extended to 400–900 nm. The responsivity (R) and external quantum efficiency (EQE) of ternary OPDs reached 230, 263, 199 mA·W –1  and 46%, 62%, 54% under 630, 530, 460 nm illumination and –1.5 V bias, respectively. The detectivity ( D *) reached 10 12  Jones. The results showed that the addition of IEICO-4F increased the exciton dissociation interface and improved the dissociation rate of the active layer, thus improving the photocurrent of the device. In addition, the addition of IEICO-4F promoted the crystallization of the film, reduced charge recombination, and thereby reduced the dark current of the device.

Characteristics of dual acceptor ternary organic photodetectors based on P3HT:PC 61 BM:IEICO-4F