Fahr Stephan, Kirchartz Thomas, Rockstuhl Carsten, Lederer Falk
Friedrich-Schiller Universit¨at Jena, Institute of Condensed Matter Theory and Solid State Optics and Abbe Center of Photonics, Max-Wien-Platz 1, 07743 Jena, Germany.
Opt Express. 2011 Jul 4;19 Suppl 4:A865-74. doi: 10.1364/OE.19.00A865.
The Lambertian limit for solar cells is a benchmark for evaluating their efficiency. It has been shown that the performance of either extremely thick or extremely thin solar cells can be driven close to this limit by using an appropriate photon management. Here we show that this is likewise possible for realistic, practically relevant thin-film solar cells based on amorphous silicon. Most importantly, we achieve this goal by relying on random textures already incorporated into state-of-the-art superstrates; with the only subtlety that their topology has to be downscaled to typical feature sizes of about 100 nm.
太阳能电池的朗伯极限是评估其效率的一个基准。研究表明，通过采用适当的光子管理，极厚或极薄的太阳能电池的性能都可以被驱动至接近这一极限。在此我们表明，对于基于非晶硅的实际且具有实际相关性的薄膜太阳能电池而言，同样可以做到这一点。最重要的是，我们依靠已纳入到先进上层结构中的随机纹理来实现这一目标；唯一的微妙之处在于，其拓扑结构必须缩小至约100纳米的典型特征尺寸。
