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Schematic diagram of MoS2(1−x)Se2x synthesis and schematic diagram of device preparation.

Herein, FePS 3 /reduced graphene oxide heterostructure has been prepared via a typical hydrothermal process, and flexible photodetectors based on hybrids have been subsequently fabricated. The photoresponse measurement results demonstrate that the photodetector exhibits obvious photoelectric conversion behavior without applied potential, indicating that the device possesses the capability to be self-powered. In addition, the photocurrent density of the asfabricated photodetectors reaches up to 125 nA cm −2 under 90 mW cm −2 illumination intensity without an external power source, which is 5.86 times higher than single FePS 3 -based devices. Furthermore, the maximum attenuation in photocurrent density of the as-fabricated flexible photodetectors measured at −0.3 V after different bending cycles and bending angles is 29.8% and 17.7%, respectively. These results demonstrate that the as-fabricated photodetectors have excellent flexibility and provide a simple and effective strategy for the construction of flexible photodetectors.

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Herein, black phosphorus (BP) quantum dots (QDs) with consistent sizes are loaded on bismuth (Bi) nanosheets (NSs) uniformly to serve as hole capturers in Group-VA monoelemental heterostructures via a facile sonication approach. The as-fabricated Bi NSs-BP QD-based photodetectors exhibit 4.6 μA/cm2 photocurrent density at applied 0.8 V bias potential, about 4.2 times enhancement compared to Bi NSs, which contributes to the construction of type-II heterojunctions that effectively restrain the recombination of electron–hole pair and accelerates the transfer rate of carriers. Additionally, the photocurrent density of Bi NSs-BP QD-based photodetectors reaches 100 nA/cm2 without external power supply, allowing fabricated devices to work normally in an emergency. Meanwhile, long-cycle stability measurements reveal 15% photocurrent density attenuation after 2000 bending times and 8.8% under 60° bending angles. This work proves that the introduction of BP QDs significantly improves the performance of the Bi-based photodetector and provides a novel strategy to construct flexible photodetectors.