Accession Number : AD0782833

Title :   Thermophotovoltaic Cells.

Descriptive Note : Final rept. Jun 72-Dec 73,


Personal Author(s) : Schwartz,R. J. ; Gardner,N. F. ; Lammert,Michael ; Munro,Philip

Report Date : JUN 1974

Pagination or Media Count : 80

Abstract : In this report the fabrication, testing, and test results obtained on a germanium PIN Photovoltaic cell intended for use in a thermophotovoltaic energy conversion system are described. The cells were tested using a tungsten source with a spectral distribution approaching that of a 3220K black body. Conversion efficiencies as high as 11.72% were observed. The performance of these cells was measured at radiation intensities as high as 10 watts/ sq. cm. and the performance of the cells was observed to be continuously improving as the radiation intensity increased. The open circuit voltage which was observed in these devices was lower than previously computed. The causes of the lower than expected open circuit voltage were determined to be the device thickness, which was larger than optimum for the radiation source, and the presence of a surface recombination which increased at high radiation intensity levels. Heat sink performance tests indicate that the device can be adequately heat sinked for operation at radiation intensities in excess of 10 watts/sq. cm. Recommendations for future work on these devices are also presented. (Author)

Descriptors :   *Semiconductor devices, *Photovoltaic effect, Semiconductor junctions, Germanium, Fabrication, Surface properties, Test methods

Subject Categories : Electrical and Electronic Equipment
      Electric Power Production and Distribution

Distribution Statement : APPROVED FOR PUBLIC RELEASE