The van der Waals heterojunctions are crucial for the development of next-generation high-performance optoelectronic devices due to their high-quality interface. In this study, FePS/MoS van der Waals heterojunctions were fabricated, and their electronic and optoelectronic properties were investigated. The devices demonstrated typical rectification behavior, characterized by a low rectification ratio and electron-dominated conductivity. The suppression of electron recombination was achieved by eliminating non-heterojunction regions on the FePS side, leading to enhanced device performance. Notably, a large rectification ratio of 6.3 × 10 and an ideality factor of 1.24 were observed. Furthermore, the devices also exhibited self-driven photodetection performance, including a responsivity of 203 mA/W, a high-speed response/recovery time of 70.4/92 μs, and a high on/off ratio of 5.4 × 10. Responsivity and on/off ratio were further improved to higher values of 1.4 A/W and 1.2 × 10 by the modulation of . The results offer valuable insights for improving and developing high-performance devices based on two-dimensional materials and heterojunctions.
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