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Local photodoping in monolayer MoS2.

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Laser-induced electrostatic doping (photodoping) in 2D materials like MoS2 transistors is local. This effect fills electronic states, preventing photocurrent generation and highlighting the crucial role of the gate-insulator interface.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Electrostatic doping in 2D materials via laser exposure (photodoping) offers tunable optoelectronic properties.
  • The localized nature of photodoping in optoelectronic devices remains under-investigated.

Purpose of the Study:

  • To investigate the localized effects of permanent photodoping on photocurrent generation in MoS2 transistors.
  • To elucidate the role of the gate-insulator interface in photodoping phenomena.

Main Methods:

  • Scanning photocurrent microscopy (SPCM) was employed to analyze photocurrent generation.
  • MoS2 transistors on various substrates were compared to study persistent photocurrent (PPC).

Main Results:

  • Photodoping was found to locally fill electronic states in the MoS2 conduction band.
  • This filling prevents photon absorption and subsequent photocurrent generation in the MoS2 sheet.
  • The gate-insulator interface was identified as crucial for generating the photodoping effect.

Conclusions:

  • Photodoping in MoS2 transistors is a localized phenomenon that can inhibit photocurrent generation.
  • The gate-insulator interface plays a critical role in enabling photodoping.
  • This research advances the understanding and potential implementation of photodoping in integrated devices.