EPITAXIAL LEAD SULFIDE PHOTOVOLTAIC CELLS AND PHOTOCONDUCTIVE FILMS
- 1 June 1970
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 16 (11) , 446-449
- https://doi.org/10.1063/1.1653061
Abstract
Single‐crystal lead sulfide photovoltaic cells and photoconductive films were prepared using epitaxial growth techniques. The spectral response of the photovoltaic cells is characterized by a sharp peak at wavelengths just short of the energy gap of PbS. The photoconductive films were grown with carrier concentrations as low as 3×1016 cm−3 and exhibit two large, distinct photoconductive signals when cooled to 77 °K. One response is characterized by a time constant > 50 msec and is attributed to photoexcitation of electrons from oxygen‐induced surface traps. The second response has a time constant of 32 μ sec and is attributed to intrinsic photoconductivity of lead sulfide.Keywords
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