Flat-plate solar array project process development area. Process research of non-CZ silicon material. Quarterly report No. 1, November 4, 1983-December 31, 1983
In this program the fabrication of solar cells on N-base silicon using simultaneous diffusion of liquid boron and phosphorus dopants to form the desired P/sup +/NN/sup +/ cell structure will be studied. This simultaneous junction formation method will be compared to the sequential junction formation method where phosphorus will be diffused first to form an N/sup +/N back surface field followed by a boron diffusion for the P/sup +/N front junction. In the standard Westinghouse baseline sequence, P-type dendritic web silicon crystals are grown and processed into solar cells. Simultaneous junction processing dictates the use of N-base crystals in order to reverse the front and rear junction dopants. With this reversal, the faster diffusing (phosphorus) will form the deeper back junction while the slower diffusing source (boron) will form the more shallow front junction. During this period, several lots of N-type crystals were grown on standard Westinghouse pre-pilot line dendritic web growth furnaces. Growth parameters and growth characteristics were not affected by the switch from boron doped to phosphorus doped silicon charges. Several experiments have been carried out to define the gas compositions and flows and the oxide stripping solutions required to produce a stain-free surface on the cell. Any residual staining after diffusion, especially on the P/sup +/ (sun) side of the cell, has been found to degrade cell performance.
- Research Organization:
- Westinghouse Electric Corp., Pittsburgh, PA (USA). Advanced Energy Systems Div.
- DOE Contract Number:
- NAS-7-100-956616
- OSTI ID:
- 5281929
- Report Number(s):
- DOE/JPL/956616-1; WAESD-TR-84-0001; ON: DE84006397
- Country of Publication:
- United States
- Language:
- English
Similar Records
Flat-Plate Solar Array Project process development area. Process research of non-CZ silicon material. Final report, November 1983-January 1986
Process research of non-CZ silicon material. Quarterly report No. 2, January 1, 1984-March 31, 1984
Related Subjects
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
CRYSTAL DOPING
CRYSTAL GROWTH
CRYSTAL GROWTH METHODS
DENDRITIC WEB GROWTH METHOD
DIFFUSION
DIRECT ENERGY CONVERTERS
ELEMENTS
EQUIPMENT
FABRICATION
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
SEMIMETALS
SILICON
SILICON SOLAR CELLS
SOLAR CELLS
SOLAR EQUIPMENT