Electrical properties improvement of multicrystalline silicon solar cells using a combination of porous silicon and vanadium oxide treatment

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• 作者：L. Derbali ; ^{derbali.lotfi1@yahoo.fr} ; H. Ezzaouia
• 关键词：Multicrystalline silicon ; Passivation ; Porous silicon ; Photoluminescence ; Conversion efficiency ; WTC-120 lifetime tester ; IQE
• 刊名：Applied Surface Science
• 出版年：2013
• 出版时间：15 April, 2013
• 年：2013
• 卷：271
• 期：Complete
• 页码：234-239
• 全文大小：740 K

文摘

In this paper, we will report the enhancement of the conversion efficiency of multicrystalline silicon solar cells after coating the front surface with a porous silicon layer treated with vanadium oxide. The incorporation of vanadium oxide into the porous silicon (PS) structure, followed by a thermal treatment under oxygen ambient, leads to an important decrease of the surface reflectivity, a significant enhancement of the effective minority carrier lifetime (¦Ó_eff) and a significant enhancement of the photoluminescence (PL) of the PS structure. We Obtained a noticeable increase of (¦Ó_eff) from 3.11 ¦Ìs to 134.74 ¦Ìs and the surface recombination velocity (S_eff) have decreased from 8441 cm s^?1 to 195 cm s^?1. The reflectivity spectra of obtained films, performed in the 300-1200 nm wavelength range, show an important decrease of the average reflectivity from 40 % to 5 % . We notice a significant improvement of the internal quantum efficiency (IQE) in the used multicrystalline silicon substrates. Results are analyzed and compared to those carried out on a reference (untreated) sample. The electrical properties of the treated silicon solar cells were improved noticeably as regard to the reference (untreated) sample.