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Previous issue date: 2013-01-10 / The goal of this work was to develop solar cells with aluminum back surface field by using the aluminum paste PV 381. Specifically, the influence of the metallization process on the rear was evaluated, the firing temperature of the metallization pastes and diffusion of Al was experimentally optimized, solar cells with phosphorus diffusied on the front face and on both sides were compared, the effect of passivation in the region of the back surface field and the surface density of the Al paste deposited on the back surface field were evaluated. Cells processed with phosphorus diffusion on both sides and rear metallization with busbars deposited before the deposition of the paste Al on all surface with exception of the regions with the busbars presented the best results. The best cell with an efficiency of 13.6 % was processed with temperature for drying the paste of Ag and Al of 300 ? C and 270 ? C respectively. The belt speed during the firing of the pastes affects slightly the efficiency of the devices. The initial minority carrier lifetime increased of 30 μs to 120 μs, after diffusion of phosphorus and remained at the value of about 200 μs after drying and firing the three metallization pastes. For solar cells with only diffusion of phosphorus on the front face, the silicon dioxide passivation on rear face reduced the efficiency. The best average efficiency of 15 % was obtained with aluminum diffusion/firing at 840 ?C and 870 ?C in devices with two layers of Al paste. Electrical parameters of the best solar cell were: Voc = 592 mV, Jsc = 33.5 mA/cm2, FF = 0.76 and efficiency of the 15.1 %. In this case, the average minority carrier diffusion length was of 1280 μm. / O objetivo deste trabalho foi desenvolver c?lulas solares com campo retrodifusor de alum?nio, a partir da pasta de alum?nio PV 381. Especificamente, avaliou-se a influ?ncia da metaliza??o na face posterior, otimizou-se experimentalmente a temperatura de queima das pastas de metaliza??o e da difus?o de Al, compararam-se c?lulas solares com difus?o de f?sforo na face frontal e em ambas as faces, avaliou-se a influ?ncia da passiva??o na regi?o do campo retrodifusor e da densidade superficial da pasta de Al que forma o campo retrodifusor. As c?lulas processadas com difus?o de f?sforo em ambas as faces e metaliza??o posterior com barras coletoras depositadas antes da pasta de Al depositada em toda a superf?cie com exce??o das regi?es com as barras coletoras apresentaram os melhores resultados. A melhor c?lula, com efici?ncia de 13,6 %, foi processada com a temperatura para a secagem da pasta de Ag e de Al de 300 ?C e de 270 ?C, respectivamente. Constatou-se que a velocidade da esteira nos processos de queima das pastas met?licas praticamente n?o afetou a efici?ncia dos dispositivos. O tempo de vida dos portadores de carga minorit?rios inicial de 30 μs aumentou para 120 μs, ap?s a difus?o de f?sforo e permaneceu com o valor de aproximadamente 200 μs ap?s a secagem e queima das tr?s pastas met?licas. Para c?lulas solares com difus?o de f?sforo somente na face frontal, a passiva??o com di?xido de sil?cio na face posterior piorou a efici?ncia. A melhor efici?ncia m?dia, de 15 %, foi obtida com a temperatura de queima/difus?o de 840 ?C e 870 ?C, em dispositivos com duas camadas de pasta de Al. Os par?metros el?tricos da melhor c?lula solar foram: Voc = 592 mV, Jsc = 33,5 mA/cm2, FF = 0,76 e efici?ncia de 15,1 %. Neste caso, o comprimento de difus?o dos portadores de carga minorit?rios m?dio foi de 1280 μm.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/3230 |
| Date | 10 January 2013 |
| Creators | Gon?alves, Vanessa Alves |
| Contributors | Zanesco, Izete |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Engenharia e Tecnologia de Materiais, PUCRS, BR, Faculdade de Engenharia |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -7432719344215120122, 500, 600, -655770572761439785 |
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