Descripción
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10 ?m thick liquid-phase crystallized silicon (Si) layers on 3.2 mm Borofloat 33 glass (5cm x 5cm) are fabricated by continuous wave line focus laser (808 nm). A sputtered SiO2/SiON layer stack has been implemented as barrier layer at the glass Si interface. Solar cells with interdigitated back contact are prepared on these multicrystalline layers by using low temperature (<400oC) Doped-by-Laser (DopLa) fabrication concept. ALDAl2O3/ PECVD amorphous intrinsic Si carbide (SiCx(i)) stack for emitter passivation and a-SiCy(i)/P-doped a- SiCz(n)/a-SiCx(i) stack for base passivation are deposited. With short pulse (ns) UV laser (355 nm) p-type emitter (by Al-diffusion from Al2O3) and point contacts with back surface field (by P-diffusion from a-SiCz(n) layer) are fabricated on n-type mc-Si absorbers layers. Solar cell process steps are monitored by charge carrier lifetime measurements using the quasi steady-state photoconductance method. A strong dependency of charge carrier lifetime on injection level and doping density of absorbers is observed. Higher lifetimes are found for lower absorber doping concentrations. In 0.7 ?cm LPCSG absorber highest eff ? 300 ns corresponding to Leff > 20 ?m is found. Laserdoping and contacting using UV laser resulted in small (< 20 mV) loss of Voc(1sun). Crack formation in LPCSG absorbers after laser crystallization process presents technological problems in the preparation of the interdigitated metal contact. | |
Internacional
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Si |
Nombre congreso
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EU PVSEC 2017 33rd European Photovoltaic Solar Energy Conference and Exhibition |
Tipo de participación
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970 |
Lugar del congreso
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Amsterdam (Países Bajos) |
Revisores
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Si |
ISBN o ISSN
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3-936338-47-7 |
DOI
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10.4229/EUPVSEC20172017-2CV.2.19 |
Fecha inicio congreso
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25/09/2017 |
Fecha fin congreso
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29/09/2017 |
Desde la página
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827 |
Hasta la página
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831 |
Título de las actas
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33rd European Photovoltaic Solar Energy Conference and Exhibition. Proceedings of the International Conference |