Ultrafast Intrinsic Photoresponse and Direct Evidence of Sub-Gap States in Liquid Phase Exfoliated MoS2 Thin Films
Journal Article - Open Access
William Marsh Rice University Houston United States
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2-Dimensional structures with swift optical response have several technological advantages, for example they could be used as components of ultrafast light modulators, photo-detectors, and optical switches. Here we report on the fast photo switching behavior of thin films of liquid phase exfoliated MoS2, when excited with a continuous laser of 658 nm E 1.88 eV, over a broad range of laser power. Transient photo-conductivity measurements, using an optical pump and THz probe OPTP, reveal that photo carrier decay follows a bi-exponential time dependence, with decay times of the order of picoseconds, indicating that the photo carrier recombination occurs via trap states.
- Electrooptical and Optoelectronic Devices