Journal of Electronic Materials

, Volume 39, Issue 7, pp 863–867

Metalorganic Chemical Vapor Deposition of CdTe(133) Epilayers on Si(211) Substrates

Authors

  • Kwang-Chon Kim
    • Thin-Film Materials Research CenterKorea Institute of Science and Technology
    • School of Electrical and Electronic EngineeringYonsei University
  • Hyun Jae Kim
    • School of Electrical and Electronic EngineeringYonsei University
  • Sang-Hee Suh
    • Center for Nanostructured Materials TechnologyKorea Institute of Science and Technology
  • M. Carmody
    • EPIR Technologies
  • S. Sivananthan
    • EPIR Technologies
    • Thin-Film Materials Research CenterKorea Institute of Science and Technology
Article

DOI: 10.1007/s11664-010-1220-6

Cite this article as:
Kim, K., Kim, H.J., Suh, S. et al. Journal of Elec Materi (2010) 39: 863. doi:10.1007/s11664-010-1220-6

Single-crystalline CdTe(133) films have been grown by metalorganic chemical vapor deposition on Si(211) substrates. We studied the effect of various growth parameters on the surface morphology and structural quality of CdTe films. Proper oxide removal from the Si substrate is considered to be the principal factor that influences both the morphology and epitaxial quality of the CdTe films. In order to obtain single-crystalline CdTe(133) films, a two-stage growth method was used, i.e., a low-temperature buffer layer step and a high- temperature growth step. Even when the low-temperature buffer layer shows polycrystalline structure, the overgrown layer shows single-crystalline structure. During the subsequent high-temperature growth, two-dimensional crystallites grow faster than other, randomly distributed crystallites in the buffer layer. This is because the capturing of adatoms by steps occurs more easily due to increased adatom mobility. From the viewpoint of crystallographic orientation, it is assumed that the surface structure of Si(211) consists of (111) terrace and (100) step planes with an interplanar angle of 54.8°. This surface structure may provide many preferable nucleation sites for adatoms compared with nominally flat Si(100) or (111) surfaces. The surface morphology of the resulting films shows macroscopic rectangular-shaped terrace—step structures that are considered to be a (111) terrace with two {112} step planes directed toward 〈110〉.

Keywords

Thin film MOCVD CdTe/Si buffer layer thermal cleaning

Copyright information

© TMS 2010