Photoreflectance study of strained InAlAs/InP structures

Jenn Shyong Hwang, W. Y. Chou, S. L. Tyan, Y. C. Wang, J. H. Tung

研究成果: Conference article同行評審


We have studied the photoreflectance spectra at 300 K from a series of strained In1-xAlxAs/InP (0.42<x<0.57) strained structures grown by molecular beam epitaxy. From the observed Franz-Keldysh Oscillation we evaluate the built-in dc electric field and hence the surface potential under different strain. We found that the surface Fermi level is not pinned at midgap under different strain, which results in contrast to AlGaAs and GaAs. In addition, from the observed dependence of the built-in electric field Fdc and surface potential barrier Vm on the top layer thickness, we conclude that the surface states are distributed over two separate regions within the energy band gap under different strain and the densities of the surface states are as low as (2.71 ± 0.05)× 1011 cm-2 for the distribution near the conduction band and (4.29 ± 0.05)× 1011 cm-2 for the distribution near the valence band. The Fermi level is weakly pinned while the top layer thickness is within the characteristic region of each sample.

頁(從 - 到)217-222
期刊Materials Research Society Symposium - Proceedings
出版狀態Published - 1995 十二月 1
事件Proceedings of the 1995 MRS Spring Meeting - San Francisco, CA, USA
持續時間: 1995 四月 171995 四月 20

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 凝聚態物理學
  • 材料力學
  • 機械工業


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