Accession Number : AD0847127

Title :   Improved CdTe Solar Cell and Array Environmental Effects Investigation.

Descriptive Note : Quarterly technical progress rept. no. 6, 1 Jun-31 Aug 68,

Corporate Author : GENERAL ELECTRIC CO SYRACUSE NY SPECIAL INFORMATION PRODUCTS DEPT

Personal Author(s) : Aldrich, R. W. ; Marple, D. T. F.

Report Date : SEP 1968

Pagination or Media Count : 28

Abstract : The output voltage of Cu2TE:CdTe heterojunction cells might be improved by using instead a pn homojunction, a metal:semiconductor barrier, or some other type of heterojunction. During the present quarter phosphorus diffusion has been used to form shallow pn homojunctions. Some photoresponse was noted, but severe current limiting was experienced due to high p-region sheet resistivity. Also re-examined was gold:CdTe barriers, formed by both evaporation and electroless deposition. One evaporated gold cell yielded unusually high open-circuit voltage (680 mv), but current (and efficiency) were relatively low. Work on short-circuit current improvement chiefly involved improving the area utilization factor from about 89% to 95%, using better evaporation masks and hold-down techniques. An attempt was made to gain extrinsic absorption of light by growing CdSe(x)Te(1-x) mixed crystal films, but no increase in current was noted. Two methods for calculating short-circuit currents and efficiencies from spectral response data are given. A non-linear relationship between output current and illumination intensity in thin film cells was noted and a method for taking this into account in efficiency calculations is given.

Descriptors :   (*CADMIUM COMPOUNDS, SOLAR CELLS), (*SOLAR CELLS, MANUFACTURING), TELLURIDES, COPPER COMPOUNDS, CRYSTAL GROWTH, ULTRAVIOLET SPECTRA, VISIBLE SPECTRA, RESPONSE(BIOLOGY), CALIBRATION, DEPOSITION, EVAPORATION, GOLD, PHOSPHORUS, CRYSTAL DEFECTS, SEMICONDUCTING FILMS, SOLAR PANELS.

Subject Categories : Electric Power Production and Distribution
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE