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Title: Photovoltaic response in pristine WSe{sub 2} layers modulated by metal-induced surface-charge-transfer doping

We obtained photovoltaic response in pristine multilayer WSe{sub 2} by sandwiching WSe{sub 2} between top and bottom metals. In this structure, the work-function difference between the top metal and WSe{sub 2} plays a critical role in generating built-in potentials and photovoltaic responses. Our devices with Zn as top metal exhibit photo-conversion efficiencies up to 6.7% under 532ā€‰nm illumination and external quantum efficiencies in the range of 40%ā€“83% for visible light. This work provides a method for generating photovoltaic responses in layered semiconductors without detrimental doping or exquisite heterostructures, and also advances the physics for modulating the band structures of such emerging semiconductors.
Authors:
; ; ; ; ;  [1]
  1. Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109 (United States)
Publication Date:
OSTI Identifier:
22489084
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; LAYERS; METALS; PHOTOVOLTAIC EFFECT; POTENTIALS; QUANTUM EFFICIENCY; SEMICONDUCTOR MATERIALS; SURFACES; VISIBLE RADIATION; WORK FUNCTIONS