Optical band gap of hydrogenated amorphous-boron thin films: The effect of thermal treatment
Journal Article
·
· Appl. Phys. Lett.; (United States)
Hydrogenated amorphous-boron thin films produced by glow-discharge decomposition of a gas mixture of 3.1 vol. % diborane and 96.9 vol. % hydrogen have been heat treated at 360 and 400 /sup 0/C. The resulting absorption coefficients and optical band gaps have been measured as a function of heat-treatment time and temperature. Both the absorption coefficients and the optical band gaps of these films can be drastically changed by such treatments. Thermal treatment at 400 /sup 0/C for 200 h results in a systematic decrease in the optical band gap from 2.19 to 0.90 eV. From quantitative hydrogen analyses it is shown that hydrogen evolution during heating plays a strong role in reducing the apparent optical band gap. These results indicate that it might be possible to optimize theoretical amorphous-boron thin films through the tailoring of the optical band gap by such thermal treatment.
- Research Organization:
- Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27706
- DOE Contract Number:
- AC03-79ET23041
- OSTI ID:
- 5457491
- Journal Information:
- Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 36:12; ISSN APPLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
ABSORPTION
AMORPHOUS STATE
BORANES
BORON
BORON COMPOUNDS
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
DATA
DISPERSIONS
ELECTRIC DISCHARGES
ELEMENTS
ENERGY GAP
FILMS
FLUIDS
GASES
HEAT TREATMENTS
HIGH TEMPERATURE
HYDROGEN
HYDROGENATION
INFORMATION
MIXTURES
NONMETALS
QUANTITY RATIO
SEMIMETALS
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
360601* -- Other Materials-- Preparation & Manufacture
ABSORPTION
AMORPHOUS STATE
BORANES
BORON
BORON COMPOUNDS
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
DATA
DISPERSIONS
ELECTRIC DISCHARGES
ELEMENTS
ENERGY GAP
FILMS
FLUIDS
GASES
HEAT TREATMENTS
HIGH TEMPERATURE
HYDROGEN
HYDROGENATION
INFORMATION
MIXTURES
NONMETALS
QUANTITY RATIO
SEMIMETALS
TEMPERATURE DEPENDENCE
TIME DEPENDENCE