Recent Investigations of Metal Oxide/CdTe Heterojunction Solar Cells PDF Download

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Recent Investigations of Metal Oxide/CdTe Heterojunction Solar Cells

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Recent investigations of the properties of ZnO and indium--tin oxide (ITO) films both on glass and as components of single crystal p-CdTe based heterojunction solar cells are described. It was shown that ZnO films deposited by rf sputtering or spray pyrolysis can be brought within the desired conductivity range for solar cell performance. First generation n-ZnO/p-CdTe solar cells show high values of J/sub sc/ = 19 mA/cm/sup 2/ and solar efficiency n/sub s/ = 4.6% (AM2 simulation). Heterojunctions of n-ITO/p-CdTe prepared by rf sputtering give V/sub oc/ = 0.82 V, J/sub sc/ = 14.5 mA/cm/sup 2/, and n/sub s/ = 8% but properties are very sensitive to preparation variables. Preliminary structural studies have been made on the ITO films in situ on CdTe substrates to elucidate this sensitivity. The results of heat-treatments on both ZnO and ITO cells are also discussed.