High Detectivity and Fast MoS2 Monolayer MSM Photodetector

Metal-semiconductor-metal (MSM) photodetectors offer efficient solutions for many applications. Here, we combine surface energy assisted wet transfer of a MoS2 monolayer with patterned interdigitated platinum electrodes. The chemical vapor deposition (CVD)-deposited MoS2 monolayer is analyzed for various performance parameters. The achieved dark current and photocurrent are 5.37 x 10-8 A and on the order of 10-5 A, respectively. The achieved peak responsivity and peak external quantum efficiency are 13.15 mA/W at 480 nm and 21.86% at 4.5 V, respectively. The Ion/Ioff ratio obtained is 256 for 5 V with a rise and fall time of 0.06 and 0.14 ms, respectively.

Automated summary

Metal-semiconductor-metal (MSM) photodetectors achieve efficient performance with low dark current and high photocurrent, as well as high peak responsivity and external quantum efficiency, through wet transfer and patterned electrode structure.