Browsing University Center of Excellence for Photovoltaics Conference Papers by Title
Now showing items 42-59 of 59
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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. ... -
Self-Aligned Self-Doping Selective Emitter for Screen-Printed Silicon Solar Cells
(Georgia Institute of Technology, 2001-10)A self-aligned selective emitter for screen-printed solar cells is described in which phosphorus dopant is incorporated into a silver paste and diffused into the silicon. This produces an ohmic contact on 70-100 Ω/ emitter ... -
Self-Doping Contacts and Associated Silicon Solar Cell Structures
(Georgia Institute of Technology, 1998-07)Contacts to <111> Si which are self-doping and self-aligning were investigated. Such contacts are applicable both to conventional cell structures as selective emitters and to more demanding structures such as interdigitated ... -
String Ribbon Silicon Solar Cells with 17.8% Efficiency
(Georgia Institute of Technology, 2003-05)We have fabricated 4 cm(2) cells on String Ribbon Si wafers with efficiencies of 17.8% using a combination of laboratory and industrial processes. These are the most efficient String Ribbon devices made to date, demonstrating ... -
Study of Direct PECVD SiN(x)-Induced Surface Emitter and Bulk Defect Passivation in P-Type Silicon Solar Cells
(Georgia Institute of Technology, 2005-01)This paper shows that direct low-frequency (LF) deposition of SiN films at 425 °C by PECVD followed by a conventional screen-printed contact firing cycle is more effective than a high-frequency (HF) SiN film deposited at ... -
Understanding and Development of Ag Pastes for Silicon Solar Cells with High Sheet-Resistance Emitters
(Georgia Institute of Technology, 2004-06)The effect of different properties of the inorganic constituents of the Ag paste used for the front metal grid is investigated for high sheet-resistance emitters. Our results show that both glass frit chemistry and Ag ... -
Understanding of the RTP-assisted Reduction of Hydrogen Dissociation from Defects in EFG Si
(Georgia Institute of Technology, 2004-01)This paper shows that very short, one second, firing of screen-printed Al on the back and SiN(x) anti-reflection coating on the front can significantly enhance the bulk lifetime in EFG Si through SiN(x)-induced hydrogenation ... -
Understanding the Role of Forming Gas on the Screen-Printed Crystalline Silicon Solar Cell Front Grid
(Georgia Institute of Technology, 2006-09)In this paper we report on the role of forming gas anneal on the fill factor of a small area cell and efficiency loss due to scaling the cell area. Solar cells that are under-fired and those fired at the optimum peak firing ...