Low surface recombination in silicon-heterojunction solar cells with rear laser-fired contacts from aluminum foils
In this study, an approach to create laser-fired contacts from aluminum foils is studied on p-type silicon-heterojunction solar cells. This alternative approach consists of the use of aluminum foils instead of evaporated layers as a metal source and rear electrode for the laser-firing process. A q-s...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/28117 |
| Acceso en línea: | https://hdl.handle.net/2117/28117 https://dx.doi.org/10.1109/JPHOTOV.2015.2411055 |
| Access Level: | acceso abierto |
| Palabra clave: | Solar cells. Silicon solar cells. Amorphous silicon crystalline silicon (c-Si) heterojunctions laser-fired contacts (LFC) solar cells surface passivation OPTIMIZATION Cèl·lules solars -- Materials Làsers Cristalls de silici Silici -- Aplicacions industrials Àrees temàtiques de la UPC::Energies Àrees temàtiques de la UPC::Enginyeria electrònica::Optoelectrònica::Làser |
| Sumario: | In this study, an approach to create laser-fired contacts from aluminum foils is studied on p-type silicon-heterojunction solar cells. This alternative approach consists of the use of aluminum foils instead of evaporated layers as a metal source and rear electrode for the laser-firing process. A q-switched infrared laser (1064 nm) was employed to create the local point contacts. Quasi-steady-state photoconductance measurements evidenced a limited degradation in the surface passivation quality during the laser-firing process. Heterojunction solar cells fabricated with these rear contacts reached a best conversion efficiency of 18% with a remarkable open-circuit voltage of 690 mV. These values were very close to those of reference devices fabricated with evaporated aluminum layers. This result suggests a similar effect on the rear surface passivation by both contact strategies. However, external quantum efficiency curves revealed a better response from devices with a rear aluminum foil in the near infrared. Optical measurements indicate that this effect can be related to a higher internal reflection at the back surface. Consequently, laser-fired contacts from aluminum foils appear to be a fast and convenient solution for the rear contact of high-efficiency silicon solar cells. |
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