Infrared and X-ray absorption studies of CdTe thin films

Wenjie Wang, Yu Cheng Yang, Ting Shan Chan, Peng Chen, Tzuen Rong Yang, Zhe Chuan Feng

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

CdTe is an important material for thin film solar cells and radiation detectors, and with very small lattice mismatch of about 0.01% to InSb. Here, we study on a series of CdTe thin films on InSb substrate under different ion time and temperature from molecular beam epitaxy (MBE), by infrared reflectance (IRR) spectroscopy and extended X-ray absorption fine structure (EXAFS). Samples were measured by infrared reflectance spectroscopy. Simulation/fittings were performed to obtain their values of transverse optical (TO) phonon frequency, damping constant, mode strength, carrier concentration, etc. The local atomic structure and phonon properties as well as effects by the ion cleaning conditions are obtained. Samples were also measured by extended X-ray absorption fine structure (EXAFS). X-ray absorption spectra were collected at Cd K-edge (∼26711 eV) in 26500-27700 eV and X-ray fluorescence yield mode. After data processing, Fourier transform and program fittings, the bond lengths of the 1st nearest Cd-Te and 2nd nearest Cd-Cd atomic bonding as well as the coordination numbers are obtained.

Original languageEnglish
Title of host publicationThin Film Solar Technology IV
DOIs
Publication statusPublished - 2012 Dec 1
EventThin Film Solar Technology IV - San Diego, CA, United States
Duration: 2013 Aug 122013 Aug 13

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8470
ISSN (Print)0277-786X

Other

OtherThin Film Solar Technology IV
CountryUnited States
CitySan Diego, CA
Period13/8/1213/8/13

Keywords

  • Atomic bond
  • CdTe/InSb
  • Infrared reflectance
  • MBE
  • Phonon
  • Synchrotron radiation
  • X-ray absorption

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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