The optical constants of n- and p-doped In{sub 0.66}Ga{sub 0.34}As on InP (001) including the Burstein-Moss shift: Experiment and modeling
- City Univ. of New York, Brooklyn, NY (United States)
- Interface Studies, Inc., Katonah, NY (United States)
- Lockheed-Martin Corp., Schenectady, NY (United States)
The complex optical constants (real and imaginary components of the dielectric function and index of refraction) and absorption coefficient in the range 0.3--5.5 eV have been evaluated at 300K using spectral ellipsometry for a series of n-(5.7 {times} 10{sup 17} cm{sup {minus}3} < n < 5.5 {times} 10{sup 19} cm{sup {minus}3}) and p-(6.5 {times} 10{sup 17} cm{sup {minus}3} < p < 5.0 {times} 10{sup 10} cm{sup {minus}3}) doped relaxed In{sub 0.66}Ga{sub 0.34}As grown by metalorganic chemical vapor deposition on InP (001). The authors have observed the fundamental absorption edge, spin-orbit split E{sub 1}-R{sub 1}, (E{sub 1}+{Delta}{sub 1})-R{sub 1} doublet and E{sub 2} feature. The data have been fit using a comprehensive model based on the electronic energy-band structure near critical points plus relevant excitonic and band-to-band Coulomb enhancement (BBCE) effects. The intrinsic band gap of 0.612 {+-} 0.01 eV corresponds to an In composition of 66 {+-} 1%. The Burstein-Moss (BM) shift was accounted for using a Fermi level filling factor in addition to the excitonic and BBCE terms. While for the p-type samples the BM shift exhibited only parabolic effects, the n-type samples had pronounced non-parabolicity at the highest doping level, in agreement with a bandstructure calculation. By accounting for the BBCE term the authors have obtained the binding energy, R{sub 1}, of the 2D exciton associated with E{sub 1}-R{sub 1}, (E{sub 1} + {Delta}{sub 1})-R{sub 1} features. Except for Holden et al. this quantity has not been obtained from any previous ellipsometric or other optical studies.
- Research Organization:
- Knolls Atomic Power Lab. (KAPL), Niskayuna, NY (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Nuclear Energy, Washington, DC (United States)
- DOE Contract Number:
- AC12-76SN00052
- OSTI ID:
- 314130
- Report Number(s):
- KAPL-P-000129; K-98178; CONF-981055-; ON: DE99001732; TRN: AHC29907%%46
- Resource Relation:
- Conference: 4. National Renewable Energy Laboratory (NREL) conference on thermophotovoltaic generation of electricity, Denver, CO (United States), 11-14 Oct 1998; Other Information: PBD: Oct 1998
- Country of Publication:
- United States
- Language:
- English
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