We report on ultraviolet (UV) photodetectors fabricated by positioning Cadmium Telluride (CdTe) microwires (μWs) precisely by dielectrophoretic (DEP) force, where CdTe μWs were grown using an Au-catalyst-assisted closed-space-sublimation (CSS) method. The optical properties of CSS-grown CdTe μWs were characterized by micro-photoluminescence and micro-Raman spectroscopies. Optoelectronic characteristics were obtained after CdTe μWs were aligned on a pre-patterned SiO2/Si substrate by a non-uniform electric field. Photocurrents were increased with increasing the light intensities. Fast and reliable photoresponse and recovery were observed when CdTe μWs were exposed to UV illuminations. We demonstrated that high quality CdTe μWs grown by the CSS method have significant potentials as optoelectronic devices.
Bibliographical noteFunding Information:
This research was supported by a Human Resources Development grant from the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by the Ministry of Knowledge Economy (Grant No. 20104010100640), a Korea University Grant, Basic Science Research Program through the National Research Foundation of Korea (NRF) (No. 2012R1A1A2042761), and the Center for Inorganic Photovoltaic Materials (No. 2012-0001171) grant funded by the Korea government (MSIP).
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)