本文選題：薄膜太陽能電池 + 光俘獲�。� 參考：《物理學報》2014年19期

【摘要】：本文用時域有限差分法對硅層等效厚度為100 nm的具有不同前后光柵周期的介質/金屬雙光柵結構薄膜太陽能電池進行了模擬分析,比較了三角形最佳相同與不同周期光柵結構的吸收光譜特性,分析了光柵高度、填充比、硅吸收層厚度對最佳相同和不同周期光柵結構光吸收特性的影響,以及相應結構中導致光吸收增強的共振模式.結果表明前后光柵周期為1:1的共形雙光柵結構中存在光泄漏現象,偏離1:1后的光柵結構可有效地抑制低級次衍射光的泄漏,前光柵周期小于后光柵周期的結構光吸收性能的提高來自于平面波導模式在吸收層中的有效激發(fā)和傳播,而前光柵周期大于后光柵周期的結構光吸收性能的提高則來自于后光柵界面上所激發(fā)的等離子體極化模式.在較厚的硅吸收層厚度,前后光柵周期比為1:2和1:3的電池結構也會出現光泄漏現象,從而使具有最大光吸收效率的結構偏離這些周期比結構的位置.
[Abstract]:In this paper, the thin-film solar cells with the dielectric / metal double grating structure with 100 nm equivalent thickness of silicon layer with different periods before and after the grating are simulated and analyzed by using the finite-difference time-domain method (FDTD).In this paper, the absorption spectrum characteristics of the same and different period gratings are compared, and the effects of grating height, filling ratio and the thickness of silicon absorption layer on the optical absorption characteristics of the same and different period gratings are analyzed.And the resonant modes in the corresponding structures which lead to the enhancement of optical absorption.The results show that there is a phenomenon of light leakage in conformal double grating structures with a period of 1:1 before and after the grating. The grating structure deviating from 1:1 can effectively suppress the leakage of lower order diffraction light.The improvement of the absorption performance of the structure light with the period of the front grating being smaller than the period of the latter comes from the effective excitation and propagation of the planar waveguide mode in the absorption layer.The enhancement of the absorption performance of the structure light with the period of the front grating is larger than the period of the post grating is due to the plasma polarization mode excited at the interface of the post grating.When the thickness of silicon absorption layer is thicker, the structure of the cell with the period ratio of 1:2 and 1:3 will also appear the phenomenon of light leakage, which makes the structure with the maximum optical absorption efficiency deviate from the position of these periodic ratio structures.
【作者單位】： 同濟大學物理科學與工程學院;
【基金】：國家自然科學基金(批準號:60977028) 上海重點科研項目基金(批準號:09JC1413800)資助的課題~~
【分類號】：TN253;TM914.42
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本文編號：1734514