Demonstrates enhanced responsivity and response speed in photodetectors, indicating improved performance for optoelectronic devices.
Two‐dimensional transition metal dichalcogenides (TMDCs) are regarded as compelling candidates for next‐generation optoelectronic devices. Nevertheless, TMDC‐based heterojunctions still suffer from the inherent trade‐off between responsivity and response speed, severely limiting their practical deployment. Herein, we propose an oxygen defect engineering strategy to fabricate high‐performance self‐powered WSe 2 /MoTe 2 photodetectors. Benefiting from oxygen defect modulation, the optimized device delivers a responsivity of 14.64 mA/W, which is five times higher than that of the pristine counterpart. Meanwhile, the optimized device maintains ultrafast temporal response, with rise and fall times of 66.23 and 54.26 µs, respectively. This work verifies that oxygen defect engineering enables the synergistic enhancement of responsivity and response speed, providing a feasible route toward high‐performance self‐powered TMDC photodetectors for practical optoelectronic applications.
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Liu et al. (2026) studied this question.
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