Download or read book Silicon Solar Cell Process Development Fabrication and Analysis written by Optical Coating Laboratory. Photoelectronics Division and published by . This book was released on 1979 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Silicon Solar Cell Process Development Fabrication and Analysis written by Aloysius Minahan and published by . This book was released on 1981 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Silicon solar cell process development fabrication and analysis written by Optical Coating Laboratory. Photoelectronics Division and published by . This book was released on 1979 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Silicon Solar Cell Process Development Fabrication and Analysis written by Aloysius Minahan and published by . This book was released on 1981 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Silicon solar cell Process Development Fabrication and Analysis Final Report written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar cells have been fabricated from unconventional silicon materials in the second and final phase of the contract. In the most recent period of work, EFG, Web, Hem, and Continuous CZ silicon materials were fabricated into solar cells, measured and analyzed. Current-voltage measurements under AM1 conditions, in addition to those under AMO conditions, were introduced in Phase II. Several low-cost fabrication steps were included in that phase. Both Hem and Continuous CZ silicon were found to be superior to what had been provided in Phase I. Correlation between quality of starting materials and cell conversion efficiency was observed for Hem-grown silicon. Correlation between position in the crystal growth sequence and cell quality was observed for Continuous CZ.
Download or read book Silicon Solar Cell Process Development Fabrication and Analysis written by Aloysius Minahan and published by . This book was released on 1981 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Silicon Solar Cell Process Development Fabrication and Analysis Seventh Quarterly Report 1 July 1980 30 September 1980 written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress in fabrication and characterization of solar cells from EFG ribbons and HEM ingots is reported. EFG ribbons grown in carbon-containing gas atmosphere showed improved sheet quality. This new EFG provided an average baseline cell efficiency of 10.3% under AM1 (as opposed to 8.0% for the earlier EFG). The best efficiency achieved by the advanced process was 13.8% AM1. Evaluation of two ingots from the HEM process indicated that HEM has a problem of inhomogeneity in sheet quality within each of the two ingots studied to data.
Download or read book Silicon Solar Cell Process Development Fabrication and Analysis written by Joseph A. Minahan and published by . This book was released on 1979 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Silicon Solar cell Process written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Work has progressed in fabrication and characterization of solar cells from UCP wafers and LASS ribbons. Gettering tests applied to UCP wafers made little change on their performance compared with corresponding baseline data. Advanced processes such as SJ, BSF, and MLAR were also applied. While BSF by Al paste had shunting problems, cells with SJ and BSF by evaporated Al, and MLAR did achieve 14.1% AM1 on UCP silicon. The study of LASS material was very preliminary. Only a few cells with SJ, BSR, (no BSF) and MLAR were completed due to mechanical yield problems after lapping the material. Average efficiency was 10.7% AM1 with 13.4% AM1 for CZ controls. Relatively high minority carrier diffusion lengths were obtained. The lower than expected Jsc could be partially explained by low active area due to irregular sizes.
Download or read book Silicon Solar Cell Process Development Fabrication and Analysis written by Optical Coating Laboratory. Photoelectronics Division and published by . This book was released on 1980 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Silicon Solar Cell Process Development Fabrication and Analysis First Quarterly Report August 28 1978 December 31 1978 written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A program plan, baseline process, measurement program and quality control plan have been generated as enunciated by the contract. Cutting operations have been completed on the Wacker Silso silicon sheet material. The first fabrication run of Wacker Silso polycrystalline silicon into solar cells by the baseline process has been completed. Average conversion efficiency for solar cells fabricated by the baseline process from Wacker Silso sheet and measured at air mass zero was 10.4%, compared with the control cells, fabricated from single crystal CZ silicon, whose average conversion efficiency was 12.2%.
Download or read book Silicon Solar Cell Process Development Fabrication and Analysis Annual Report 22 August 1978 30 September 1979 written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar cells have been fabricated from unconventional silicon materials supplied in the Large Area Sheet Task of the Low Cost Solar Array Project. The cells were constructed using methods intended to optimize the efficiency, as well as by a standard method intended to act as a baseline procedure. Following fabrication, all cells have been measured on the Spectrolab Solar Simulator at Air Mass Zero and 28/sup 0/C. Conversion efficiencies are based upon total device area. Maximum conversion efficiency obtained for Kayex continuous CZ material has been 12.4% (optimized), for Crystal Systems HEM material 11.2% (optimized), for Mobil Tyco EFG (RH) 8.4% (baseline) and EFG (RF) 9.8% (baseline), for Westinghouse Web material 12.0% (optimized), for Motorola RTR 7.2% (baseline), and for Wacker Silso 10.6% (baseline). All of these materials are from Phase I of the Contract. Phase II of the contract has started with Mobil-Tyco EFG (RH) material. Following fabrication by the baseline method this material, as well as the others in the program, will be fabricated using low-cost processing methods.
Download or read book Silicon Solar Cell Process Development Fabrication and Analysis Phase II Annual Report 1 July 1979 30 June 1980 written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar cells were fabricated from EFG (RH) ribbons from multiple dies, silicon on ceramic (SOC), dendritic web, cast silicon by HEM, and semi-continuous CZ from both VARIAN and HAMCO. Baseline and improved solar cells were made from the sheets. Baseline solar cells processed in both Phase I and Phase II, involving cells from EFG, SOC, dendritic web, and HEM, indicated that no significant improvement in silicon sheet quality has been achieved in Phase II. Solar cells from semi-continuous CZ showed cell performance close to the conventional CZ control cells, although the cells from the semi-continuous CZ have shown wider performance range because of variation in crystalline perfection. Generally, process upgrading provided improvement in cell performance, the improvement depending on the process used and the quality of the sheet silicon. Study of the effect of grain size on solar cell performance suggested that the minimum grain size to make solar cells of 10% AMO efficiency is about 500 .mu.m, which is expected to provide minimum module efficiency of 10% AMI. If other harmful impurities are added in the process of sheet growth, the minimum grain size must be increased. The BSF study showed that the higher the resistivity of the starting substrates, the greater the relative improvement in cell performance, probably because of greater shift in Fermi levels at the back L/H junction (pp+) and also because of the higher initial values of minority carrier diffusion length. This study also suggested that proper control of the back-surface field (BSF) process could minimize the junction shunting problems often introduced by the BSF processing.
Download or read book Silicon Solar Cell Process Development Fabrication and Analysis written by Optical Coating Laboratory. Photoelectronics Division and published by . This book was released on 1980 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Silicon Solar Cell Process Development Fabrication and Analysis Fifth Quarterly Report October 1 1979 December 31 1979 written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This program investigates, develops and utilizes technologies appropriate and necessary for improving the efficiency of solar cells made from various unconventional silicon sheet materials. During this reporting period, work has progressed in fabrication and characterization of solar cells from EFG (RH) multi-ribbon, dendritic webs and cast silicon by HEM. Solar cells were fabricated using various process modifications, such as shallow junction formation, BSF, back surface reflector (BSR), surface etching and texturizing, gettering by mechanical damage and diffusion glass and grain boundary passivation. The solar cell parameters measured included open circuit voltage, short circuit current, curve fill factor, and conversion efficiency (all taken under AMO illumination). Additional measurements under AM1 conditions have been included, for direct evaluation and to collect information on the AM1/AM0 conversion factors for the various sheet materials. Also, measurement for typical cells included spectral response and minority carrier diffusion length. The obtained results were compared to the properties of cells made from conventional single crystalline Czochralski silicon with an emphasis on statistical-evaluation. Increased emphasis was given toward modifying the process to yield increased performance.
Download or read book Silicon Solar Cell Process Development Fabrication and Analysis Second Quarterly Report October 1 December 31 1978 written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: RTR (ribbon-to-ribbon) solar cells (2 x 2 cm) processed from polycrystalline feedstock showed maximum AMO efficiency of 5.6%. Solar cells from single crystalline feedstock showed slightly higher efficiency than those from polycrystalline feedstock, indicating maximum efficiency of about 6.6% with SiO AR coating. Single crystalline control cells gave 11-12% AMO efficiencies demonstrating that the poor performance of the RTR solar cells was due to the low quality of material itself (this conclusion was backed up by the separate measurement of minority carrier diffusion length). Dendritic web solar cells (2 x 2 cm) from the standard process showed maximum AMO efficiency (with SiO AR coating) of 9.8% while efficiency of control solar cells were around 11-12%. Web solar cells from back surface field (BSF) process indicated maximum AMO efficiency of 10.9%. Some improvement in open circuit voltage was noticed from the BSF process. Small light spot scanning experiments were carried out on the solar cells from Wacker Silso, EFG, RTR, and dendritic web ribbons. Photoresponse results provided information on localized cell performance and grain size in polycrystalline material, and agreed quite well with the cell performance data, such as efficiency, minority carrier diffusion length, and spectral response.
Download or read book Silicon Solar Cell Process Development Fabrication and Analysis Quarterly Report for Period Ending December 31 1979 written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar cells have been fabricated from unconventional sheet silicon in Phase II of this contract. Preparations have been made for measurement of cells under AM1 conditions. This has been accomplished by utilization of existing Pyrex water filters in combination with the X-25 Spectrolab Solar Simulator. Several experimental runs have been made utilizing screen printed silver contacts. Mobil-Tyco EFG silicon, Westinghouse web silicon and Crystal Systems heat exchange method silicon have been fabricated into solar cells by the baseline process.
