Hoffmann Andre, Paetzold Ulrich W, Zhang Chao, Merdzhanova Tsvetelina, Lambertz Andreas, Ulbrich Carolin, Bittkau Karsten, Rau Uwe
Opt Express. 2014 Aug 25;22 Suppl 5:A1270-7. doi: 10.1364/OE.22.0A1270.
Thin-film silicon tandem solar cells are composed of an amorphous silicon top cell and a microcrystalline silicon bottom cell, stacked and connected in series. In order to match the photocurrents of the top cell and the bottom cell, a proper photon management is required. Up to date, single-layer intermediate reflectors of limited spectral selectivity are applied to match the photocurrents of the top and the bottom cell. In this paper, we design and prototype multilayer intermediate reflectors based on aluminum doped zinc oxide and doped microcrystalline silicon oxide with a spectrally selective reflectance allowing for improved current matching and an overall increase of the charge carrier generation. The intermediate reflectors are successfully integrated into state-of-the-art tandem solar cells resulting in an increase of overall short-circuit current density by 0.7 mA/cm(2) in comparison to a tandem solar cell with the standard single-layer intermediate reflector.
薄膜硅串联太阳能电池由非晶硅顶电池和微晶硅底电池组成，它们堆叠并串联连接。为了匹配顶电池和底电池的光电流，需要进行适当的光子管理。迄今为止，具有有限光谱选择性的单层中间反射器被用于匹配顶电池和底电池的光电流。在本文中，我们设计并制作了基于铝掺杂氧化锌和掺杂微晶硅氧化物的多层中间反射器原型，其具有光谱选择性反射率，可改善电流匹配并总体增加电荷载流子的产生。这些中间反射器已成功集成到先进的串联太阳能电池中，与使用标准单层中间反射器的串联太阳能电池相比，总体短路电流密度增加了0.7 mA/cm²。
