含无序子结构的长周期光栅薄膜太阳电池的陷光机理

项目名称： 含无序子结构的长周期光栅薄膜太阳电池的陷光机理

项目编号： No.11504435

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 侯金

作者单位： 中南民族大学

项目金额： 23万元

中文摘要： 周期结构和无序结构在提高薄膜太阳电池陷光效率方面各存在优势，因此探索能融合两者优势的新方法就成了学术研究的一个前沿。本项目拟研究含子结构的长周期光栅薄膜的陷光机理，期望在长程有序光栅中，通过引入子结构缺陷而具有局部无序特征，从而获得优势互补，提高陷光效率。⑴采用频域和时域方法，研究子结构有序时的长周期光栅中导模谐振和慢光等特性在偏振、带宽和入射角等方面对陷光效率的影响规律，并发掘光场空域分布特征；⑵引入位置、大小和形状等子结构缺陷后，比较频域、时域和空域分布特征，探索多重散射和光局域化等无序特性的作用机理，研究陷光特性在偏振、带宽和入射角等方面的改变规律；⑶融合有序和无序结构优势，在薄膜两个表面引入合适的长周期光栅，从偏振、带宽和角度等方面综合提高陷光效率。本项目的开展不仅有望增强对有序和无序结构陷光机理的认识，还可为发展高效薄膜太阳电池、耦合器、滤波器、探测器和发光二极管等提供理论参考。

中文关键词： 长周期光栅；无序；导模谐振；子结构；陷光

英文摘要： Both periodic structure and disorder structure are of respective merits in enhancement of sunlight trapping in solar cells, so it is a significant research frontier how to combine them and learn from other’s strong points to offset one’s weakness. The project proposes to investigate light trapping behavior in a kind of thin-film solar cell with long period gratings which are composed of disorder sub-structures. We expect that by introducing sub-structure disorders into long period grating, the main merits of both periodic structures and disorder structures could be merged, and the light trapping efficiency of solar cell can be enhanced greatly. The main research content contains: ⑴ By using both the frequency domain and time domain methods, we try to find the mechanism that how guided-mode resonance and slow light in long period gratings composed of ordered sub-structures influence the trapping efficiency associated with polarization, spectra bandwidth and the incidence angles, and also to distinguish light field spatial distribution characteristics. ⑵ Taking consideration of sub-structure disorders in position, size and shape, by making comparisons in frequency domain, time domain and also spatial distribution, we try to study how the multiple scattering and optical Anderson localization work in disorder systems and to find how these features influence the trapping efficiency associated with polarization, spectra bandwidth and the incidence angle. ⑶ Introducing two long period gratings on both the surfaces of the thin-film active layer respectively, light trapping efficiency dependent on various structures parameters will be systematically studied and high light trapping efficiency thin-film solar cell will be designed. The study is expected to expand knowledge about light trapping by using both order structure and the disorder structure. It will also provide new ideas and theoretical support for the development of high performance thin-film solar cells, couplers, filters detectors and also light emitting diodes.

英文关键词： long period grating;disorder;guided mode resonance;sub-structures;light trapping