Evaluation of CdS nanostructures for application to low environmental-load CdS/CdTe solar cells

The low "environmental-load" CdS/CdTe solar cells for reducing consumption of Cd compounds have been investigated employing the CdS layers fabricated at various substrate temperatures, T/sub CdS/. The nanostructure of CdS crystallites made at different T/sub CdS/ are compared to the crysta...

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Published in3rd World Conference onPhotovoltaic Energy Conversion, 2003. Proceedings of Vol. 1; pp. 511 - 514 Vol.1
Main Authors Toyama, T., Oda, H., Matsune, K., Okamoto, H.
Format Conference Proceeding
LanguageEnglish
Published IEEE 2003
Subjects
Annealing
Crystallization
Doping
Energy conversion
Fabrication
Photovoltaic cells
Photovoltaic systems
Solar power generation
Temperature
Transistors
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Summary:The low "environmental-load" CdS/CdTe solar cells for reducing consumption of Cd compounds have been investigated employing the CdS layers fabricated at various substrate temperatures, T/sub CdS/. The nanostructure of CdS crystallites made at different T/sub CdS/ are compared to the crystallinity of CdS, and CdTe deposited on CdS as well as sulfur fraction in CdTe/sub 1-x/S/sub x/ mixed crystal layer unintentionally formed at CdS-CdTe(S) interface. To obtain relative high V/sub oc/, high crystallinity is required for CdS, while to prevent the degradation of CdS/CdTe(S) interface for keeping high FF, rather CdS with low crystallinity is suitable. To break the contradictional requirements for CdS crystallinity, a novel technique is introduced, i.e., (CH/sub 3/)/sub 2/SnCl/sub 2/ (DMTC) doping into CdS. The large sulfur fraction in CdTe/sub 1-x/S/sub x/ mixed crystal layer being a degree of the CdS/CdTe(S) interface is obtained in the solar cell employing the CdS layer doped with DMTC even when the DMTC-doped CdS layer obtains high crystallinity. So far, we have achieved 14.8% efficiency of the low environmental-load CdS/CdTe solar cell.
ISBN:4990181603
9784990181604