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Abstract
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:PC61BM 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 1012 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.
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