Investigation of liquid dopants for the production of high efficiency solar cells from dendritic web silicon
Conventional gaseous BBr/sub 3/ and CVD SiO/sub 2/ are presently used in the Westinghouse baseline process for the production of high efficiency (13%-15%) dendritic web solar cells. The objective of this study was to replace the CVD SiO/sub 2/ mask and the subsequent BBr/sub 3/ diffusion step with a liquid SiO/sub 2//liquid boron dopant diffusion process. The number of process steps are reduced significantly with the use of the liquid process. Data on time-temperature relationship on sheet resistance, junction depth, etc., were obtained and are presented. Various application techniques for the liquid process were investigated. As a first step, a manually applied sponge-squeegee applicator was used, which was later replaced with a meniscus coating machine. This equipment permitted the application of uniform layers of liquid dopants of controlled thickness on the dendritic web. Various runs were made to make direct comparison of the liquid and baseline processes. The results of cell efficiencies achieved using the liquid process indicate that high efficiencies (13%-15%) can be achieved with this process. Results of V /SUB oc/ , I /SUB sc/ , fill factor, etc., are presented in detail and compared with the baseline process. Dark IV measurements made on liquid-processed cells indicate excellent quality junctions and high lifetime values. The series and shunt resistance measurements on typical cells show no difference as compared with the baseline process. Junction profiles are presented for both a gaseous diffused cell and a liquid processed cell. The profiles show no dissimilarities.
- Research Organization:
- Westinghouse Electric Corporation, Pittsburgh, Pennsylvania
- OSTI ID:
- 6120207
- Journal Information:
- J. Electrochem. Soc.; (United States), Vol. 131:10
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SOLAR CELLS
CRYSTAL DOPING
EFFICIENCY
BORON
DENDRITES
DENDRITIC WEB GROWTH METHOD
EXPERIMENTAL DATA
LIFETIME
LIQUIDS
SILICON OXIDES
CHALCOGENIDES
CRYSTAL GROWTH METHODS
CRYSTALS
DATA
DIRECT ENERGY CONVERTERS
ELEMENTS
EQUIPMENT
FLUIDS
INFORMATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
SEMIMETALS
SILICON COMPOUNDS
SOLAR EQUIPMENT
140501* - Solar Energy Conversion- Photovoltaic Conversion