摘要
设计了一种新型叠层光栅结构的晶体硅薄膜太阳能电池底部反射器，它由分布布拉格反射器（Distributed Bragg Reflectors，DBR）和衍射光栅两部分组成。利用严格耦合波分析（Rigorous Coupled Wave Analysis，RCWA）方法和模式传输线理论（Modal Transmission Line，MTL），对DBR和光栅进行优化设计，使该叠层光栅结构在800～1100nm波长范围内能高效反射入射光并得到大倾斜角的反射光，有效延长光子在电池体区的传播路径，使其被充分吸收。结果表明，四层Si／SiO2DBR的反射率可达99．95％，零级衍射序被有效抑制，并得到具有较大倾斜角的±1级衍射序，太阳能电池的捕光能力大大提高。
We have designed a back reflector of lamellar gratings consisting of Distributed Bragg Reflectors （DBR） and diffraction gratings for crystalline thin-film silicon solar ceils. The parameters of the DBR and the grating have been optimized by Rigorous Coupled Wave Analysis （RCWA） and Modal Transmission Line （MTL） theory to obtain high reflectivity and large angle reflection in the wavelength range of 800-1 100 nm, so as to elongate the propagation length of the photons in the bulk region, which can be fully absorbed to stimulate electrons. We can see from the result that the four-layer DBR reaches an reflectivity as high as 99.95%, the 0＇h order diffraction is effectively restrained with oblique ± 1 orders, and much better light trapping can be achieved.
出处
《量子光学学报》
CSCD
北大核心
2009年第4期380-386,共7页
Journal of Quantum Optics
基金
上海市科委科技基金(0752nm014)
国家自然科学基金(60808014)
关键词
背部反射
光栅
严格耦合波分析
分布布拉格反射器
back reflection
gratings
rigorous coupled wave analysis
distributed bragg reflectors
