Light trapping in thin-film solar cells via scattering by nanostructured antireflection coatings
Light trapping in thin-film solar cells via scattering by nanostructured antireflection coatings
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DOI：
10.1063/1.4816782
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发表时间：
2013-07-28
影响因子：
3.2
通讯作者：
Yu, E. T.
中科院分区：
文献类型：
--
作者：
Li, X. H.;Li, P. C.;Yu, E. T.
在薄膜量子阱太阳能电池中，展示并分析了在薄膜太阳能电池上制备的纳米结构二氧化钛层的应用，该层可同时通过将长波长光子散射到导光模式中而提供抗反射功能和光捕获功能。纳米球光刻技术用于制造亚波长尺度二氧化钛结构的周期性阵列，并且将有源器件层从其外延生长衬底上分离并与纳米结构二氧化钛层集成，能够通过与法布里 - 珀罗共振以及半导体中的导波横向传播模式耦合来提高光吸收。结果表明，纳米结构二氧化钛层在光波长下可作为渐变折射率涂层，同时将入射光散射到器件内的导光模式中。还分析了这些效应与入射角的相关性。（C）2013美国物理联合会出版有限责任公司
The use of nanostructured TiO2 layers fabricated on thin-film solar cells to provide, simultaneously, both antireflection functionality and light trapping via scattering of long-wavelength photons into guided optical modes is demonstrated and analyzed in thin-film quantum-well solar cells. Nanosphere lithography is used for fabrication of periodic arrays of subwavelength-scale TiO2 structures, and separation of active device layers from their epitaxial growth substrate and integration with the nanostructured TiO2 layer enables increased optical absorption via coupling to both Fabry-Perot resonances and guided lateral propagation modes in the semiconductor. The nanostructured TiO2 layer is shown to act as a graded-index coating at optical wavelengths and simultaneously to scatter incident light into guided optical modes within the device. The dependence of these effects on angle of incidence is also analyzed. (C) 2013 AIP Publishing LLC.