Research on Solar-Energy Conversion Employing Cadmium Sulfide
Abstract
Application of semi-conductive CdS to photovoltaic energy conversion has been continued with primary emphasis on cells fabricated from vacuum evaporated CdS films. Back wall CdS film cells on conducting glass substrates have given conversion efficiencies up to 5% on small areas. Front wall CdS film cells on molybdenum foil substrates have given conversion efficiencies up to 2.5% on small areas and up to 1.0% on larger areas of 9 sq in. Thin light weight array have been constructed from these latter cells giving power to weight ratios up to 10 watts per pound. Possible improvements promising increases of the ratio up to 30 to 10 watts per pound are discussed. Arrays of CdS film cellsof 1 square foot area have been constructed. Fundamental investigations were initiated on the growth, annealing, etching and orientation of CdS single crystals and films. The results were correlated with the type of crystal imperfection and its probable influences on electrical properties. The photovoltaic barrier was studied experimentally to identify the essential constituents and to improve the expected efficiency of energy conversion. Theoretical models were postulated for the mechanisms occurring in the CdS photovoltaic cell. The predicted behavior was compared with actual operation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 30, 1962
- Accession Number
- AD0284032
Entities
People
- Fred A. Shirland
- G. A. Wolff
- John D. Nixon