基于蛾眼阵列的全向宽光谱减反层优化设计

为降低太阳电池封装材料PET薄膜的反射率,采用严格耦合波分析(RCWA)方法对基于蛾眼阵列的减反层进行了优化设计。对比研究了圆锥形、抛物线形和正弦形蛾眼结构的减反性能,结果表明圆锥形蛾眼结构具有最佳全向宽光谱减反性能。分析了圆锥体几何参数对太阳光透过率的影响,为参数选取提供依据。在此基础上,提出基于柱形与锥形复合结构的蛾眼阵列,通过参数优化,进一步提高了太阳光在大角度入射条件下的透过率。优化后复合结构的蛾眼阵列的PET薄膜对波长范围在0.3~1.1μm、入射角度为0°~90°的入射太阳光角度归一化透过率达到0.966 4,相比于未采取减反措施的PET薄膜透过率提高12.77%。

Optimization and Design of Omnidirectional and Broadband Antireflection Layer Based on Moth-eye Array

In order to reduce the reflectivity of solar cell PET packaging materials,the rigorous coupled wave analysis(RCWA)method is used to optimize the anti-reflection layer based on moth-eye array of PET film.Firstly,the solar light transmission characteristics of conical,parabolic and sinusoidal moth-eye structures are compared.It is shown that the conical moth-eye structure has the best omnidirectional and broadband anti-reflection performance.Meanwhile,effects of geometry parameters on moth-eye array with conical structure are analyzed,which helps to select optimal parameters.On this basis,a moth-eye array based on composite structures composed of cylindrical and conicalstructure is proposed.By optimized geometry parameters,the transmittance of sunlight under large angle incident conditions is further improved.The PET film having moth-eye array with optimized composite structures has a normalized transmittance of 0.966 4 for a solar wavelength with a wavelength range of 0.3~1.1μm under the incident angle of 0°~90°,which is 12.77% higher than that without taking countermeasures.