Investigation on antireflection coatings for Al:ZnO in silicon thin-film solar cells

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• 作者：Yuehui Lu ; Xianpeng Zhang ; Jinhua Huang ; Jia Li ; Tiefeng Wei ; Pinjun Lan ; Ye Yang ; Hua Xu ; Weijie Song
• 关键词：Antireflection coatings ; Photovoltaic transmittance ; Al-doped ZnO ; Silicon thin-film solar cells ; Propagation matrix method
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：124
• 期：18
• 页码：3392-3395
• 全文大小：622 K

文摘

We numerically investigate the role of antireflection (AR) coatings, composed of SiO₂ and/or ZnO, in suppression of interfacial reflections in the presence of the transparent conducting oxide, Al-doped ZnO (AZO). Three structures are simulated: (a) AR coatings in organic light-emitting diodes (OLEDs) and flat panel displays, (b) AR coating located between the glass and the AZO, and (c) same as the case b except the involvement of another AR coating between the AZO and the amorphous silicon layers. The weighted average transmittance according to the AM1.5 solar spectrum, the photovoltaic transmittance (T_pv), suggests that there is no evident difference between the structures a and b, especially when the layer number of AR coatings is less than three. An effective way to improve T_pv is presented in the structure c, where T_pv is increased from 73.54 % to 76.32 % with a three-layered AR coating located between AZO and a-Si. It implies that the suppression of interfacial reflections, resulting from the considerable mismatch of refractive indices at the interface of AZO and a-Si, would benefit the efficiency improvement of silicon thin-film solar cells.