Browsing University Center of Excellence for Photovoltaics Conference Papers by Title
Now showing items 21-40 of 59
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High Efficiency Screen-Printed Planar Solar Cells on Single Crystalline Silicon Materials
(Georgia Institute of Technology, 2005-01)In this paper we report on the fabrication, characterization and analysis of high efficiency planar screen-printed solar cells with high sheet resistance emitter ~ 100 Ω/square. Three single crystalline materials were ... -
High Efficiency Screen-Printed Solar Cells on Textured Mono-Crystalline Silicon
(Georgia Institute of Technology, 2005-10)In this paper we report on high efficiency screen-printed 4 cm(2) solar cells fabricated on randomly textured float zone, magnetic Czochralski (MCz) and Ga-doped Cz silicon. A simple process involving POCl(3) emitters, low ... -
Hydrogenation of Si from SiN(x):H Films: How Much Hydrogen Is Really in the Si?
(Georgia Institute of Technology, 2003-05)A promising method to introduce H into Si solar cells in order to passivate bulk defects is by the post-deposition annealing of an H-rich, SiN(x) surface layer. It previously has been difficult to characterize the small ... -
Impact of Inverter Configuration on PV System Reliability and Energy Production
(Georgia Institute of Technology, 2002-05)The loss of potential revenues due to PV system failures should be taken into consideration when the system’s life cycle cost predictions are calculated. We demonstrate a procedure for quantifying the effects of inverter ... -
Implementation of a Homogenous High-Sheet-Resistance Emitter in Multicrystalline Silicon Solar Cells
(Georgia Institute of Technology, 2005-01)Solar cell efficiency enhancement resulting from the implementation of a high-sheet-resistance emitter (95 Ω/sq.) in multicrystalline silicon solar cells with screenprinted contacts is demonstrated in this paper. Solar ... -
Implementation of Rapid Thermal Processing to Achieve Greater Than 15% Efficient Screen-Printed Ribbon Silicon Solar Cells
(Georgia Institute of Technology, 2003-05)This paper summarizes our progress in fabricating record-high efficiency ribbon Si solar cells with screen-printed and photolithography defined contacts. We have developed and optimized rapid thermal processing enhanced ... -
Implied-V(oc) and Suns-V(oc) Measurements in Multicrystalline Solar Cells
(Georgia Institute of Technology, 2002-05)Identifying loss mechanisms and predicting device performance are key goals of device and process characterization. Photoconductance measurements allow the extraction of the Implied V(oc) and Suns V(oc), which together ... -
Investigation of High-Efficiency Screen-Printed Textured SI Solar Cells with High Sheet-Resistance Emitters
(Georgia Institute of Technology, 2005-01)In this study it is found that the efficiency enhancement (Δη) resulting from the use of a 100 Ω/sq emitter instead of a conventional 45 Ω/sq emitter is substantially enhanced further by surface texturing. This enhancement ... -
Investigation of Modified Screen-Printing Al Pastes For Local Back Surface Field Formation
(Georgia Institute of Technology, 2006-05)This paper reports on a low-cost screen-printing process to form a self-aligned local back surface field (LBSF) through dielectric rear surface passivation. The process involved formation of local openings through a ... -
Investigation of RTP and Belt Fired Screen Printed AL-BSF on Textured and Planar Back Surfaces of Silicon Solar Cells
(Georgia Institute of Technology, 2003-05)Quality of screen printed (SP) Al-BSF on textured and planar back surfaces was assessed by fabricating and analyzing Si solar cells. BSF was formed by firing SP-Al in a conventional belt furnace as well as in an RTP system. ... -
Investigation of Spatially Non-Uniform Defect Passivation in EFG Si by Scanning Photoluminescence Technique
(Georgia Institute of Technology, 2005-01)This paper shows that both hydrogenation of defects from SiN(x) coating and thermally-induced dehydrogenation of defects are rapid and occur simultaneously in EFG Si during cell processing. Room-temperature scanning pho ... -
Investigation of the Effect of Resistivity and Thickness on the Performance of Cast Multicrystalline Silicon Solar Cells
(Georgia Institute of Technology, 2006-05)A low resistivity of 0.2-0.3 Ω.cm has been shown to be optimum for high quality single crystal silicon for solar cells. However, for lower quality cast mc-Si, this optimum resistivity increases owing to a dopant-defect ... -
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 ...