Browsing University Center of Excellence for Photovoltaics Conference Papers by Title
Now showing items 33-52 of 59
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Lifetime Enhancement and Low-Cost Technology Development for High-Efficiency Manufacturable Silicon Solar Cells
(Georgia Institute of Technology, 2001-08)A low-cost, manufacturable defect gettering and passivation treatment, involving simultaneous anneal of a PECVD SiN(x) film and a screen-printed Al layer, is found to improve the lifetime in Si ribbon materials from 1-10 ... -
Lifetime Enhancement During Processing of Porous Silicon Cells
(Georgia Institute of Technology, 2001-08)Porous silicon (PS) induced lifetime enhancement was investigated in dendritic web and string ribbon silicon. As-grown lifetime in web was <1 µs, which improved by a factor of 3.27 due to 860 degrees C/2 min heat treatment. ... -
Lifetime Enhancement in EFG Multicrystalline Silicon
(Georgia Institute of Technology, 2000-09)P and AI gettering and SiN-induced hydrogenation of EFG Si have been investigated using manufacturable process techniques. Annealing of SiN coated EFG, without AI on the back, shows very little defect passivation with maximum ... -
Light Induced Degradation in Manufacturable Multi-crystalline Silicon Solar Cells
(Georgia Institute of Technology, 2001-08)Traditional Czochralski grown Si solar cells are known to suffer from light induced degradation (LID) which adversely affects the minority carrier lifetime. Multi-crystalline Si has also been shown to show a similar ... -
Light Induced Degradation in Promising Multi-Crystalline Silicon Materials for Solar Cell Fabrication
(Georgia Institute of Technology, 2003-05)Light induced degradation (LID) in boron doped Czochralski (Cz) silicon with high oxygen content is known to degrade solar cell efficiency. Multicrystalline Si crystals also have oxygen and use B doping, but LID effects ... -
Modeling the Effects of Uncertainty and Reliability on the Cost of Energy from PV Systems
(Georgia Institute of Technology, 2005-06)The cost of energy produced by a photovoltaic system is dependent upon the amount of energy produced by the system and the amortized cost of the system's components. Existing simulation tools either use crude estimators ... -
A New Generalized Detailed Balance Formulation to Calculate Solar Cell Efficiency Limits
(Georgia Institute of Technology, 2001-10)Solar cells efficiency limits can be calculated either by thermodynamic or detailed balance approaches. For a single energy (i.e., single junction) solar cell, detailed balance equations are identical to the thermodynamic ... -
Novel Processing of Solar Cells with Porous Silicon Texturing
(Georgia Institute of Technology, 2000-09)A simple porous silicon texturing technique that is applicable to various kinds of silicon material, including multicrystalline and ribbon Si, of any doping type and level is used to fabricate solar cells. Acidic etching ... -
Numerical Approach to Uncertainty and Sensitivity Analysis in Forecasting the Manufacturing Cost and Performance of PV Modules
(Georgia Institute of Technology, 2004-06)Forecasting of the manufacturing cost of PV modules is governed by a large number of uncertain factors. Cost estimates are frequently based upon imperfect information and, as a result, may not be perfectly accurate. Existing ... -
Optimization of Self-Doping Ag Paste Firing to Achieve High Fill Factors on Screen- Printed Silicon Solar Cells with a 100 Ω/sq. Emitter
(Georgia Institute of Technology, 2002-05)Self-aligned selective-emitter cells have been fabricated using a self-doping paste by co-firing the front and back contacts. Good ohmic contacts with ~0.774 fill factor were obtained on 100 Ω/sq. emitters after alloying ... -
PECVD SiN(x) Induced Hydrogen Passivation in String Ribbon Silicon
(Georgia Institute of Technology, 2000-09)To improve the bulk minority carrier lifetime in String Ribbon silicon, SiN(x) induced defect passivation during a post deposition anneal is investigated. Our results indicate that SiN(x) induced hydrogen passivation is ... -
Production Viability of Gallium Doped Mono-Crystalline Solar Cells
(Georgia Institute of Technology, 2005-01)Results of efforts at Shell Solar to implement the use of gallium dopant as a commercial solar cell production process are presented. Both small area cell results and production related activities and results are discussed. ... -
Rapid and Accurate Determination of Series Resistance and Fill Factor Losses in Industrial Silicon Solar Cells
(Georgia Institute of Technology, 2001-10)Lower than ideal fill factors (FF) are caused by parasitic series (R(s)) and shunt (R(shunt)) resistances, and non-ideal diode properties. The challenge is to quantify the FF losses quickly, simply and without ambiguity. ... -
Rapid Photo-Assisted Forming Gas Anneal (FGA) for High Quality Screen-Printed Contacts for Silicon Solar Cells
(Georgia Institute of Technology, 2000-09)Formation of low-cost high-quality contacts is the key to cost-effective silicon solar cells. Screen-printing is widely used in Industry because it is simple, low-cost and rapid. However, cost and throughput gains are ... -
Rapid Thermal Processing for Front and Rear Contact Passivation
(Georgia Institute of Technology, 2002-05)Rapid firing processes are well known to allow improvements in solar cell contacts, particularly for the rear contact. Previous results characterizing the quality of a rear aluminum-alloyed back surface field have measured ... -
Rapid Thermal Technologies for High Efficiency Silicon Solar Cells
(Georgia Institute of Technology, 2001-06)This paper shows that rapidly formed emitters (≤ 6 min) in a conveyor belt furnace or 3 minutes in an RTP system, in conjunction with a screen-printed (SP) RTP Al-BSF and passivating oxide formed simultaneously in 2 minutes ... -
Record High Efficiency Screen-Printed Belt Co-Fired Cells on Cast Multi-Crystalline Silicon
(Georgia Institute of Technology, 2004-06)Record-high efficiency screen-printed 4 cm(2) solar cells were achieved on HEM and Baysix cast multi-crystalline silicon. These cells were fabricated using a simple, manufacturable process involving POCl3 diffusion for a ... -
Record-High-Efficiency Solar Cells on Multicrystalline Materials Through Understanding and Implementation of RTP-Enhanced SiNx-induced Defect Hydrogenation
(Georgia Institute of Technology, 2004-01)This paper presents results on five record-high-efficiency 4 cm(2) solar cells on three different multicrystalline silicon materials through effective hydrogen passivation of bulk defects during cell processing. Silicon ... -
RIE-Texturing of Multicrystalline Silicon Solar Cells
(Georgia Institute of Technology, 2001-06)We developed a maskless plasma texturing technique for multicrystalline silicon (mc-Si) cells using Reactive Ion Etching (RIE) that results in higher cell performance than that of standard untextured cells. Elimination of ... -
Screen-Printed Back Surface Reflector for Light Trapping in Crystalline Silicon Solar Cells
(Georgia Institute of Technology, 2001-10)Evaporated metal back surface reflectors have been shown to yield high values of internal rear reflectance, and are particularly eff ective when combined with a thin dielectric layer between the silicon and the metal. ...