CAJ | 학술논문

通过频域叠加设计具有可见光至红外波段全角度禁带的复合结构一维光子晶体背反射板，有效增加了太阳能电池对长波波段光子的吸收。利用平面波展开法和传输矩阵法，分别研究介质填充比对该反射板晶体能带分布的影响，以及光线斜入射时光子禁带边缘平移随介质填充比、晶格常数及周期的变化关系。结果发现，当入射角从0°变化到89°，禁带边缘的波长越大平移越大，周期增加可减弱晶体对角度变化的敏感性，晶格常数是影响完全禁带宽度变化的主要因素。
통과빈역첩가설계구유가견광지홍외파단전각도금대적복합결구일유광자정체배반사판，유효증가료태양능전지대장파파단광자적흡수。이용평면파전개법화전수구진법，분별연구개질전충비대해반사판정체능대분포적영향，이급광선사입사시광자금대변연평이수개질전충비、정격상수급주기적변화관계。결과발현，당입사각종0°변화도89°，금대변연적파장월대평이월대，주기증가가감약정체대각도변화적민감성，정격상수시영향완전금대관도변화적주요인소。
Since the absorption ratio of the thin-film silicon solar cells is quite low in the range of wavelength 500-1 100 nm, a photonic crystal reflector with omnidirectional forbidden band located in the visible and infrared region was designed by using the frequency domain overlapping. The plane wave expansion method and the transmission matrix method were used to analyze the influence of the medium filling ratio on the photonic bandgap distribution of the reflector and the translation of the bandgap edge as functions of the filling ratio, lattice constants and period num-bers at oblique incidence. The results show that, when the incidence angle is changing from 0° to 89°, the wave-length of the bandgap edge becomes larger in the results of a wider translation range and the increase of the period numbers. It can reduce the reflector’s sensitivity to the angles. The lattice constant is the main factor influencing the change of the bandwidth.