TITLE

Electroabsorption measurements and built-in potentials in amorphous silicon-germanium solar cells

AUTHOR(S)
Lyou, J. H.; Schiff, E. A.; Guha, S.; Yang, J.
PUB. DATE
March 2001
SOURCE
Applied Physics Letters;3/26/2001, Vol. 78 Issue 13, p1924
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report electromodulated reflectance spectra in n-i-p solar cells with hydrogenated amorphous silicon-germanium alloy absorber layers. At lower photon energies the spectra are determined by bulk electroabsorption, and exhibit peaks near the optical gap of the absorber layers. Voltage scaling of the electroabsorption spectra indicate a built-in potential of V[sub bi]=1.17 V in cells with absorber layer band gaps of 1.50 eV; in conjunction with earlier work, this value argues against a systematic decline in V[sub bi] with an absorber layer band gap. At higher photon energies the spectra are due to direct electroreflectance; the voltage scaling was consistent with model predictions for the electric field at the interface of the p-type and absorber layers. © 2001 American Institute of Physics.
ACCESSION #
4711158

 

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