利用SiO2和TiO2介质,设计了一种可用于太阳能电池反射器的一维光子晶体.采用传输矩阵法对该光子晶体从可见光至近红外波长范围的反射谱进行了模拟计算,并分别讨论了周期数和入射角不同时反射谱的变化.结果表明:光线垂直入射时,周期数N增加,其反射谱在短波段的禁带数增加、禁带宽度变窄,而长波段的反射率增加.入射角θ增大时,平均反射率增加,因而该光子晶体具有良好的角度宽容性,可作为高效的太阳能电池率反射器.%One dimensional photonic crystal is designed for solar cells reflector with medium SiO2 and TiO2. The reflection spectrum of the photonic crystal from visible light to near infrared wavelength is simulated with the transfer matrix method. The variations of reflection spectra at different incident angle and with different number of cycles are discussed respectively. The results indicate that at the normal incidence,the number of the band gap increases and the gap width narrows in the short wavelength as the number of cycles N increasing,whereas,the reflectivity increases in the long wavelength under the same condition. The average reflectance increases as the incident angle $ increasing; therefore the photonic crystal has better tolerance in angle,which can be used as the reflector to improve the efficiency of solar cells.
展开▼
