Open AccessSelf-aligned growth of CdTe photodetectors using a graphene seed layer
Author(s) -
Gwangseok Yang,
Dong Hwan Kim,
Jihyun Kim
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.0a1081
Subject(s) - graphene , photodetector , materials science , cadmium telluride photovoltaics , optoelectronics , ohmic contact , nucleation , layer (electronics) , fabrication , semiconductor , optics , nanotechnology , physics , medicine , alternative medicine , pathology , thermodynamics
We demonstrate the self-aligned growth of CdTe photodetectors using graphene as a pre-defined seed layer. Defects were generated in the graphene prior to growth to act as CdTe nucleation sites. Self-aligned CdTe structures were grown selectively on the pre-defined graphene region. The electrical and optoelectrical properties of the photodetectors were systematically analyzed. Our CdTe devices displayed Ohmic behavior with a low sheet resistance of 1.24 × 10(8) Ω/sq. Excellent photodetecting performances were achieved, including a high on-off ratio (~2.8), fast response time (10.4 s), and highly reproducible photoresponses. The fabrication method proposed here for these self-aligned device structures proves valuable for the development of next-generation graphene-semiconductor hybrid devices.