High-efficiency photon capturing in ultrathin silicon solar cells with front nanobowl texture and truncated-nanopyramid reflector

• DOI: 10.1364/ol.40.001077
• Publication Date: 2015-03-11T18:29:06Z
• Authors: Zhenhai Yang; Xiaofeng Li; Shaolong Wu; Pingqi Gao; Jichun Ye
• Keywords: Photocurrent; Reflector (photography); Reflection; Texture (cosmology)

We present a crystalline siliconthin-film (5 μm) solar cell decorated by front nanobowled texture and rear truncated-nanopyramid silver reflector. This design substantially suppresses the overall light reflection enhances optical resonances inside silicon film leading to photon-capturing performance comparable Yablonovitch limit. show that absorption can be greatly improved adjusting ratio of periods between nanostructures with an optimal ultimate photocurrent density around 35.3 mA/cm2 enhancement 42.6% relative planar counterpart. A thorough optoelectronic simulation predicts light-conversion efficiency 15.5%, i.e., 67.3% higher than system.