標題: Combined micro- and nano-scale surface textures for enhanced near-infrared light harvesting in silicon photovoltaics
作者: Chang, Chia-Hua
Yu, Peichen
Hsu, Min-Hsiang
Tseng, Ping-Cheng
Chang, Wei-Lun
Sun, Wen-Ching
Hsu, Wei-Chih
Hsu, Shih-Hsin
Chang, Yia-Chung
光電工程學系
Department of Photonics
公開日期: 4-Mar-2011
摘要: As silicon photovoltaics evolve towards thin-wafer technologies, efficient optical absorption for the near-infrared wavelengths has become particularly challenging. In this work, we present a solution that employs combined micro- and nano-scale surface textures to increase light harvesting in the near-infrared for crystalline silicon photovoltaics, and discuss the associated antireflection and scattering mechanisms. The surface textures are achieved by uniformly depositing a layer of indium-tin-oxide nanowhiskers on micro-grooved silicon substrates using electron-beam evaporation. The nanowhiskers facilitate optical transmission in the near-infrared by functioning as impedance matching layers with effective refractive indices gradually varying from 1 to 1.3. Materials with such unique refractive index characteristics are not readily available in nature. As a result, the solar cell with combined textures achieves over 90% external quantum efficiencies for a broad wavelength range of 460-980 nm, which is crucial to the development of advanced thin-substrate silicon solar cells.
URI: http://dx.doi.org/10.1088/0957-4484/22/9/095201
http://hdl.handle.net/11536/9158
ISSN: 0957-4484
DOI: 10.1088/0957-4484/22/9/095201
期刊: NANOTECHNOLOGY
Volume: 22
Issue: 9
結束頁: 
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