Strategies for boosting the performance of MoS2 photodetectors using hybrid heterostructures three


On the other hand, the RGO–MoS2 composite exhibits strong light absorption up to 2 μm and dominant photovoltaic property at 1310 and 1550 nm where the corresponding current Ion/Ioff ratios of 1.9 × 106 and 1.2 × 106 and detective values of 2.04 × 1012 and 1.8 × 1012 Jones were measured, respectively. Electron–hole pairs are generated in the RGO–MoS2/Si heterojunction under light illumination and then separated at the heterojunction interface due to the built-in-electric field. The RGO–MoS2/pyramid Si heterojunction device also displayed faster rise/decay times of 2.8 μs/46.6 μs compared with 32.6 μs/87.8 μs for the MoS2/pyramid Si device due to the increased conductivity and internal electric field. The defects in MoS2 assist in absorbing the light from NIR to MIR wavelength range; as a result, photoexcited carriers from MoS2 are transferred to the RGO layer, giving rise to the photocurrent in the NIR–MIR region. Therefore, the RGO–MoS2/pyramid Si heterojunction-based photodetector could operate from 350 nm to 4.3 μm (UV to MIR) ultrabroad spectral range due to the bandgap narrowing caused by the S vacancy defects in MoS2 crystals. XPS measurements and theoretical calculation also confirmed the existence of S vacancies where Mo/S atomic ratios of 1: 2, 1: 1.87, and 1: 163 yielded bandgaps of 1.18, 0.30, and 0.28 eV, respectively, indicating a dramatic reduction in the bandgap of MoS2. These results demonstrated that forming a hybrid heterostructure and occurring S vacancy defects in MoS2 crystals contributed to the high performance of the RGO–MoS2/pyramid Si heterojunction-based ultra-broadband photodetectors. In another study, Peng et al.179 used an rGO layer as the conducting channel and a perovskite/MoS2 bulk heterojunction (BHJ) as a photosensitizer for developing a hybrid photodetector that showed a photoresponsivity of 1.08 × 104 A W−1, a detective of 4.28 × 1013 Jones, an EQE value of 2.0 × 106%, and a >45 ms photoresponse time. The high photoresponse in the hybrid heterostructured system originated from the hole transfer from the perovskite to the rGO layer, facilitated by suppressing the recombination of photocarriers from the perovskite/MoS2 BHJ along with electron trapping in the MoS2 layers. If you are looking for high quality, high purity, and cost-effective Molybdenum disulfide, or if you require the latest price of Molybdenum disulfide, please feel free to email contact mis-asia.

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