排序方式: 共有5条查询结果,搜索用时 0 毫秒
1
1.
Design of periodic metal-insulator-metal waveguide back structures for the enhancement of light absorption in thin-film solar cells 下载免费PDF全文
To increase the absorption in a thin layer of absorbing material (amorphous silicon, a-Si), a light trapping design is presented. The designed structure incorporates periodic metal-insulator-metal waveguides to enhance the optical path length of light within the solar cells. The new design can result in broadband optical absorption enhancement not only for transverse magnetic (TM)-polarized light, but also for transverse electric (TE)-polarized light. No plasmonic modes can be excited in TE-polarization, but because of the coupling into the a-Si planar waveguide guiding modes and the diffraction of light by the bottom periodic structures into higher diffraction orders, the total absorption in the active region is also increased. The results from rigorous coupled wave analysis show that the overall optical absorption in the active layer can be greatly enhanced by up to 40%. The designed structures presented in this paper can be integrated with back contact technology to potentially produce high-efficiency thin-film solar cell devices. 相似文献
2.
A concave two-dimensional(2D) photonic crystal waveguide(PCW) with corrugated surface is theoretically used as a focusing structure.To design this structure,a genetic algorithm is combined with the finite-difference time-domain method.For PCWs with different degrees of concaveness,the power reaches about 80% at different focusing points when the morphology of the concave surface is optimized.More importantly,the focusing location is easily controlled by changing the location of the detector placed in the output field. 相似文献
3.
4.
5.
研究了基于一维电介质-磁光子晶体的全方向全反射镜(简称全反镜)。利用传输矩阵法分析了全反镜的传输特性。为了获得宽频带全反镜,利用十进制遗传算法优化全反镜的结构参数,即层厚度系数与周期数。设计过程逐步详细阐述。计算结果指出,随着参加优化的变量(厚度系数和周期数)数增多,全反带更宽,薄膜层数更少、结构总厚度更薄。最后得到了一个宽带全反镜 (0.255A0.255B)5(0.169A0.066B)8,其带宽可达1.34ω0,而薄膜层数大幅降为26层,总厚度仅为1.8634λ0,结构也非常简单。 相似文献
1