Thin-Film Silicon Triple-Junction Solar Cells on Highly Transparent Front Electrodes With Stabilized Efficiencies up to 12.8%
Thin-Film Silicon Triple-Junction Solar Cells on Highly Transparent Front Electrodes With Stabilized Efficiencies up to 12.8%
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薄膜%20硅%20三结%20太阳能%20电池%20on%20Highly%20透明%20正面%20电极%20With%20稳定%20效率%20up%20to%2012.8%
DOI：
10.1109/jphotov.2014.2307162
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发表时间：
2014
影响因子：
3
通讯作者：
C. Ballif
中科院分区：
文献类型：
--
作者：
J. Schuttauf;G. Bugnon;M. Stuckelberger;S. Hänni;M. Boccard;M. Despeisse;F. Haug;F. Meillaud;C. Ballif
采用非晶硅顶部电池吸收层以及微晶硅中间和底部电池吸收层制造了 p-i-n 配置的高效薄膜硅三结太阳能电池。三结电池是在具有不同表面形貌的硼掺杂氧化锌（ZnO）薄膜上制造的。为此，使用 Ar 等离子体进行三个不同的处理时间来平整自然生长的粗糙 ZnO 表面。我们在最短的时间内实现了超过 30 mA/cm2 的总电流密度，初始和稳定转换效率分别为 13.5% 和 12.5%。对于中等处理时间，我们获得了最高效率（初始效率为 13.7%，稳定效率为 12.8%），而最长处理时间导致最高开路电压 (VOC) 为 1.91 V，但电流密度较低，初始效率为 12.9%，稳定效率为 12.2%。这些结果是通过结合最近开发的各种功能和方法获得的：首先，我们实现了具有新型缓冲层的高质量 μc-Si:H 电池，从而实现了非常高的效率。其次，我们在前玻璃上应用了随机纹理的金字塔来改善光耦合，最后，我们使用了非常薄（~140 nm）的顶部电池，这导致光引起的退化较低（相对效率损失为 5%-7%）。
High-efficiency thin-film silicon triple-junction solar cells in p-i-n configuration have been fabricated using amorphous silicon top cell absorber layers, as well as microcrystalline silicon middle and bottom cell absorbers. The triple-junction cells were fabricated on boron doped zinc oxide (ZnO) films with different surface morphologies. To this end, the naturally grown rough ZnO surfaces were flattened using an Ar plasma for three different treatment times. For the shortest time, we achieved a summed current density over 30 mA/cm2 and initial and stabilized conversion efficiencies of 13.5% and 12.5%, respectively. For the medium treatment time, we obtained the highest efficiencies (13.7% initial and 12.8% stable), whereas the longest treatment time led to the highest open-circuit voltage (VOC) of 1.91 V but lower current densities, leading to efficiencies of 12.9% initial and 12.2% stable, respectively. These results were obtained by combining various recently developed features and approaches: first of all, we implemented high-quality μc-Si:H cells with novel buffer layers, leading to very high efficiencies. Second, we applied randomly textured pyramids on the front glass to improve light in-coupling, and finally, we used very thin (~140 nm) top cells that led to a low light-induced degradation (5%-7% relative loss in efficiency).