Application of CIS to high-efficiency PV module fabrication. Annual technical progress report, April 1, 1995--March 31, 1996
- International Solar Electric Technology, Inglewood, CA (United States)
The authors investigated the interactions between the soda-lime glass substrate, the Mo contract film and the CIS absorber layer. Excessive Na diffusion through the Mo layer was found to be the reason for excessive interaction between the substrate and the CIS layers obtained by the H{sub 2}Se selenization technique. This chemical interaction influenced the stoichiometric uniformity of the absorbers. Addition of Ga into the CIS layers by the two-stage selenization technique yielded graded absorber structures with higher Ga content near the Mo/absorber interface. Gallium was later diffused through the absorber film by a high-temperature annealing step, and large bandgap alloys were obtained. Solar cells with active-area efficiencies of close to 12% were fabricated on these CIGS layers. Sulfur addition experiments were also carried out during this period. By controlling the Se and S availability to the precursors during the reaction step of the process, various S profiles were obtained in high-bandgap absorber layers. The highest-efficiency cell made on S-containing absorbers was about 10% efficient. A low-cost, non-vacuum technique was successfully developed for CIS film growth. Layers prepared using this novel approach were used for solar-cell and submodule fabrication. Solar cells with active-area efficiencies around 13% were demonstrated; submodules with efficiencies above 8% were also fabricated. These results represent the best PV devices ever produced on CIS layers obtained by a non-vacuum technique.
- Research Organization:
- National Renewable Energy Lab., Golden, CO (United States); International Solar Electric Technology, Inglewood, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC36-83CH10093
- OSTI ID:
- 266649
- Report Number(s):
- NREL/TP--413-21355; ON: DE96007913
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
AUGER ELECTRON SPECTROSCOPY
CADMIUM SULFIDES
CHEMICAL VAPOR DEPOSITION
COPPER SELENIDE SOLAR CELLS
COPPER SELENIDES
EXPERIMENTAL DATA
FABRICATION
GALLIUM SELENIDES
GRADED BAND GAPS
INDIUM SELENIDE SOLAR CELLS
INDIUM SELENIDES
INTERACTIONS
MOLYBDENUM
PROGRESS REPORT
QUANTUM EFFICIENCY
SOLAR ABSORBERS
SUBSTRATES
ZINC OXIDES