| IMPROVED CDTE SOLAR CELL AND ARRAY ENVIRONMENTAL EFFECTS INVESTIGATION. |
31 MAY 1968 |
|
| Authors:
Richard S. Schlotterbeck; GENERAL ELECTRIC CO LYNCHBURG VA POLYCRYSTALLINE SEMICONDUCTOR PRODUCTS BUSIN ESS SECTION
|
 | Work on the basic physics and chemistry of the Cu2Te-CdTe system as well as means for defining the proper measuring and evaluation procedures of actual cells are presented in detail. Significant contributions towards improvement in understanding the more fundamental aspects of the CdTe solar cell were made in the following areas: use of optical microscopic techniques in ascertaining the 'metallography' of thin film cells; electron diffraction studies, maintenance tests, and ... |
|
| IMPROVED CDTE SOLAR CELL AND ARRAY ENVIRONMENTAL EFFECTS INVESTIGATION. |
DEC 1967 |
|
| Authors:
Richard S. Schlotterbeck; GENERAL ELECTRIC CO LYNCHBURG VA POLYCRYSTALLINE SEMICONDUCTOR PRODUCTS BUSIN ESS SECTION
|
| A simple and quick procedure for preparing and testing CdTe: Cu2Te solar cells made from single crystalline CdTe is described. This new technique will reduce the overall time factor for device preparation and test and thereby increase the efficiency of research investigations. The applied research program was directed to studies of the effects of substrate etching and phosphorus doping on cell performance. It has been shown that the ferricyanide etch ... |
|
| IMPROVED CDTE SOLAR CELL AND ARRAY ENVIRONMENTAL EFFECTS INVESTIGATION. |
31 AUG 1967 |
|
| Authors:
Richard S. Schlotterbeck; GENERAL ELECTRIC CO LYNCHBURG VA POLYCRYSTALLINE SEMICONDUCTOR PRODUCTS BUSIN ESS SECTION
|
| Several one square inch cells have been made from light weight material and 2-12 micron CdTe films. These cells had a weight-to-area ratio of 0.022 pounds per square foot and a power-to-weight ratio of 140 watts per pound. A generally negative exponential dependence of cell leakage conductance on film thickness has been observed. Interesting results have been noted on films grown on moly substrates treated in a wide variety of ... |
|
| IMPROVED CDTE SOLAR CELL AND ARRAY ENVIRONMENTAL EFFECTS INVESTIGATION. |
JUN 1967 |
|
| Authors:
Richard S. Schlotterbeck; GENERAL ELECTRIC CO LYNCHBURG VA POLYCRYSTALLINE SEMICONDUCTOR PRODUCTS BUSIN ESS SECTION
|
| The use of thin aluminum and titanium foils, as well as 0.5 mil molybdenum, was examined as substrate materials for CdTe films. Substantial reduction in cell weight was achieved with the successful use of the 0.5 mil molybdenum. The consequences of a reduced CdTe film thickness (5-7 microns) was examined. Cell quality, particularly junction leakage conductance, has been found to depend critically upon substrate pretreatments. The formation of P-N junctions ... |
|
| THIN FILM PHOTOVOLTAIC CELL ARRAY INVESTIGATION. |
APR 1967 |
|
| Authors:
R. W. Aldrich; F. A. Blake; G. D. Ferguson Jr.; R. E. Halsted; GENERAL ELECTRIC CO LYNCHBURG VA POLYCRYSTALLINE SEMICONDUCTOR PRODUCTS BUSIN ESS SECTION
|
| A twenty-month investigation was conducted on thin film cadmium telluride photovoltaic cells and arrays involving basic and applied materials research, film growth, module fabrication and array concept design study. Spectral response measurements were made to determine the intrinsic effects of 125 C heat treatment and electron irradiation on single crystals and polycrystalline films. Long term stability tests on CdTe cells stored under ambient environment have shown changes in Isc of ... |
|
| THIN FILM PHOTOVOLTAIC CELL ARRAY INVESTIGATION. |
30 NOV 1966 |
|
| Authors:
Richard S. Schlotterbeck; GENERAL ELECTRIC CO LYNCHBURG VA POLYCRYSTALLINE SEMICONDUCTOR PRODUCTS BUSIN ESS SECTION
|
| Work has continued with the objective of showing the feasibility of fabricating a large area array segment in which individual cells are simultaneously interconnected by thin film techniques. The ohmic contact has proven to be the major obstacle to the achievement of an integrated array with reasonable performance. An evaporated zinc contact shows promise of solving this problem. Progress has been made toward the elimination of all photo-resist steps in ... |
|
| THIN FILM PHOTOVOLTAIC CELL ARRAY INVESTIGATION. |
SEP 1966 |
|
| Authors:
Richard S. Schlotterbeck; GENERAL ELECTRIC CO LYNCHBURG VA POLYCRYSTALLINE SEMICONDUCTOR PRODUCTS BUSIN ESS SECTION
|
| Studies were continued in four principal areas: (1) improvements in cell efficiency and stability; (2) assembly of a 28-volt module; (3) construction of an array deployment demonstration section; (4) integrated thin film cell array. Stable, 4.0% efficiency cells can be made on a predictable, reproducible basis with the Cu2Te-barrier based on ambient storage tests. Significant improvement in cell stability under high temperature-air storage conditions has been observed on a few ... |
|
| THIN FILM PHOTOVOLTAIC CELL ARRAY INVESTIGATION. |
JUN 1966 |
|
| Authors:
Richard S. Schlotterbeck; GENERAL ELECTRIC CO LYNCHBURG VA POLYCRYSTALLINE SEMICONDUCTOR PRODUCTS BUSIN ESS SECTION
|
| Single crystal CD/TE solar cells have been fabricated by procedures analogous to those employed with thin film cells. The effect of high temperature (125 C in helium) and 1.5 mev electron irradiation (5 x 10 to the 16th power/sq. cm) upon the spectral response and V-1 characteristics of single crystal cells has been examined. Polycrystalline thin film CD/TE cells have been examined for stability under storage at various combinations of ... |
|
| THIN FILM PHOTOVOLTAIC CELL ARRAY INVESTIGATION. |
FEB 1966 |
|
| Authors:
Richard S. Schlotterbeck; GENERAL ELECTRIC CO LYNCHBURG VA POLYCRYSTALLINE SEMICONDUCTOR PRODUCTS BUSIN ESS SECTION
|
| Spectral response measurements have been made on a number of cadmium telluride films wherein a variety of process procedures were evaluated. These included: Junction Forming Time, Substrate Pretreatment, Antimony vs. Copper Doping, Coatings and Post-Heat Treatment. Significant findings were: (1) Spectral response can be affected by the tailoring composition; (2) Shifts in spectral response can result from differences in substrate treatment. Long-term stability tests on cells stored under ambient environment ... |
|
| THIN FILM PHOTOVOLTAIC CELL ARRAY INVESTIGATION. |
NOV 1965 |
|
| Authors:
GENERAL ELECTRIC CO LYNCHBURG VA POLYCRYSTALLINE SEMICONDUCTOR PRODUCTS BUSIN ESS SECTION
|
| A very thin evaporated metal copper precoat on the molybdenum substrate has been shown to result in improved film uniformity and higher cell efficiency. Substitution of antimony for copper chloride in the tailored region produced cells with efficiencies equal to the average 'standard' cell. Spectral response curves are not yet available. It was shown that cadmium chloride could be used as a substitute material in place of gallium to provide ... |
|
Reports by Corporate Author
