Chemical doping of MoS2 layers

As discussed above, the performance of MoS2 photodetectors can be significantly increased by doping MoS2 layers with APTES,180 rhodamines 6G181, and ZnPc182 organic dyes, which efficiently generate charge transfer interfaces between MoS2 and chemical dopants. A few examples of boosting the performance of MoS2 photodetectors via chemical doping are presented here. Heo et al.187 used n-type doping of MoS2 flakes with triphenylphosphine (PPh3) to improve the electronic and optoelectronic properties of multilayer MoS2 by utilizing charge transfer from PPh3 to MoS2, in which the PPh3 doping concentration ranged from 1.56 × 1011 to 9.75 × 1012 cm−2. The PPh3 doping considerably increased the mobility from 12.1 to 241 cm2 V−1 s−1 and the Ion/Ioff current ratio from 8.72 × 104 to 8.70 × 105 for the MoS2 transistor. The photoresponsivity of the MoS2 photodetector similarly increased from 2.77 × 103 to a maximum value of 3.92 × 105 A W−1 under an applied laser power of 5 pW. The detective decreased by three orders of magnitude, from 6.82 × 1013 Jones to 2.36 × 1010 Jones, as the device doping temperature was increased from 150 °C to 350 °C. The MoS2 photodetector also showed long-term stability, where the photoresponsivity decreased by 1.58% after 14 days of exposure to air; additionally, the PPh3 doping was reversible, allowing repetitive use of the photodetector device. For example, a MoS2/Si heterojunction-based photodetector showed no degradation in the photovoltage after storing it in an air atmosphere for over a month. 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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