Optical absorption coefficient and minority carrier diffusion length measurements in low-cost silicon solar cell material

Journal Article · Mon Nov 01 00:00:00 EST 1982 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.330158· OSTI ID:6742699

Swimm, R T; Dumas, K A

The optical absorption coefficient of silicon solar cell material grown by three low-cost growth methods was measured in the wavelength interval 0.8< or =lambda< or =1.0 ..mu..m, the wavelength region of interest in surface photovoltage measurements of the minority carrier diffusion length. The square root of the absorption coefficient was found to vary linearly with photon energy over the wavelengths studied, and the measured data agree with a linear empirical fit to within 0.5% RMS. The absorption coefficients obtained are slightly lower than those reported by Runyan, with the greatest disagreement at long wavelengths. Minority carrier diffusion lengths computed using the present absorption coefficients are approximately 16% greater than those calculated using Runyan's data. Excellent sample-to-sample agreement within and between lots indicates that for two of the growth methods studied, material quality as judged by optical properties has not been sacrificed by the use of low-cost growth methods. Samples grown by the third growth method studied showed measurably poorer optical quality.

• Research Organization: Center for Laser Studies, University of Southern California, University Park, Los Angeles, California 90089
• OSTI ID: 6742699
• Journal Information: J. Appl. Phys.; (United States), Vol. 53:11
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
SILICON SOLAR CELLS
ABSORPTIVITY
OPTICAL PROPERTIES
CHARGE CARRIERS
DIFFUSION LENGTH
EXPERIMENTAL DATA
INFRARED RADIATION
MATHEMATICAL MODELS
PHOTOVOLTAIC EFFECT
SURFACES
WAVELENGTHS
DATA
DIMENSIONS
DIRECT ENERGY CONVERTERS
ELECTROMAGNETIC RADIATION
EQUIPMENT
INFORMATION
LENGTH
NUMERICAL DATA
PHOTOELECTRIC CELLS
PHOTOELECTROMAGNETIC EFFECTS
PHOTOVOLTAIC CELLS
PHYSICAL PROPERTIES
RADIATIONS
SOLAR CELLS
SOLAR EQUIPMENT
140501* - Solar Energy Conversion- Photovoltaic Conversion