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

Journal Article · Mon Aug 10 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4928567· OSTI ID:22489084

Wi, Sungjin; Chen, Mikai; Li, Da; Nam, Hongsuk; Meyhofer, Edgar; Liang, Xiaogan ^[1]

---

1. Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109 (United States)

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 532 nm illumination and external quantum efficiencies in the range of 40%–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.

• OSTI ID: 22489084
• Journal Information: Applied Physics Letters, Vol. 107, Issue 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
LAYERS
METALS
PHOTOVOLTAIC EFFECT
POTENTIALS
QUANTUM EFFICIENCY
SEMICONDUCTOR MATERIALS
SURFACES
VISIBLE RADIATION
WORK FUNCTIONS