Enhanced nanocrystalline silicon solar cell with a photonic crystal back-reflector
Enhanced nanocrystalline silicon solar cell with a photonic crystal back-reflector
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DOI：
10.1016/j.solmat.2010.08.007
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发表时间：
2010-12
影响因子：
6.9
通讯作者：
R. Biswas;J. Bhattacharya;Brian W. Lewis;N. Chakravarty;V. Dalal
中科院分区：
文献类型：
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作者：
R. Biswas;J. Bhattacharya;Brian W. Lewis;N. Chakravarty;V. Dalal
利用光子晶体背反射器增强了纳米硅太阳能电池。采用严格的散射矩阵模拟方法对一种由三角形点阵纳米孔组成的光子晶体背反射器进行了优化设计，其孔距接近800 nm。采用光刻和反应离子刻蚀的方法在晶体硅衬底上制备了间距为800 nm的光子晶体背反射镜，并在其表面涂覆了银和氧化锌。在图案化的衬底上生长纳米晶体硅太阳能电池。我们观察到的吸收和光生电流相对于Ag/ZnO衬底的0.7%的增强，在带边附近的增强比为1.5。由于入射光的衍射共振，在大于700 nm的近红外波长处的光子吸收发生显著增强。
Nanocrystalline silicon solar cells were enhanced with a photonic crystal back-reflector. Rigorous scattering matrix simulations were used to optimize a photonic crystal back-reflector consisting of a triangular lattice of nano-holes, with a pitch near 800nm. The photonic crystal back-reflector with a pitch of 800nm was fabricated on the crystalline silicon substrate by photolithography and reactive-ion etching, and coated with silver and zinc oxide. Nanocrystalline silicon solar cells were grown on the patterned substrates. We observed ∼7% enhancement of the absorption and photo-generated current relative to a Ag/ZnO substrate, with an enhancement ratio of 1.5 near the band edge. Significant enhancement occurred in photon absorption at near infrared wavelengths greater than 700nm, due to diffraction resonances of the incoming light.