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基于级联金属光栅结构的有机太阳能电池宽谱吸收增强

Broadband absorption enhancement of organic solar cells based on cascaded metallic gratings
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摘要 为拓宽活性材料对太阳光谱的吸收范围,实现器件的宽谱吸收增强,本文提出一种基于光栅结构的新型有机太阳能电池器件,该器件在一个周期内引入不同占空比的光栅来构成级联光栅。本文采用时域有限差分法从理论上研究了级联光栅结构对器件吸收性能的影响,结果表明该结构可激发多个表面等离激元谐振,这些不同波长下的谐振模式可以在吸收光谱中同时存在,从而实现宽谱吸收增强。考虑太阳光谱的影响,在TM和TM/TE混合偏振模式下,活性材料的整体吸收效率从等效平板结构的23.9%分别提高到54.2%和36.4%,分别增强126.8%和52.3%,且基于该级联光栅结构的太阳能电池器件可实现在0到65度入射角范围内的广角吸收。此外,在TM偏振模式下,该器件的吸收性能对光栅参数微小误差变化的敏感性较低,适用于实际纳米器件的制备。这项工作的理论结果有助于纳米金属光栅在有机太阳能电池中的应用提供新的理论指导。 In order to broaden the absorption range of the active material to the solar spectrum and realized the wide spectrum absorption enhancement of the device.In this paper, a novel organic solar device based on the grating structure is proposed,which introduces gratin gs with different duty ratios in one period to form the cascaded gratings.The effect of cascade g rating structure on the absorption performance of the device is studied by FDTD.The results show th at the broadband absorption enhancement can be realized by exciting multiple surface plasmon reso nances modes and these resonance modes at different wavelengths can exist simultaneously in t he absorption spectrum.Under the TM and TM/TE hybrid polarization mode,the integrated absorp tion efficiency of the active material increased from 23.9% to 54.2% and 36.4%,respectively, compared with that of the equivalent planar structure,and increased by 126.8% a nd 52.3%,respectively.And the wide-angle absorption of the cascaded grating in the range of 0to 65degrees incidence angle can be achieved.The absorption performance of the device is les s sensitive to the slight error of grating parameters and is suitable for the preparation of practi cal nanometer devices.The design and findings of this work can exploit further a pplications of metallic gratings in OSCs devices.
作者 王丹 刘欣 杨毅彪 陈智辉 费宏明 张明达 曹斌照 WANG Dan;LIU Xin;YANG Yi-biao;CHEN Zhi-hui;FEI Hong-ming;ZHANG Ming-da;CAO Bin-zhao(College of Physics and Optoelectronic,Taiyuan University of Technology ,Taiyuan 030024,China)
出处 《光电子.激光》 EI CAS CSCD 北大核心 2019年第6期580-587,共8页 Journal of Optoelectronics·laser
基金 国家自然科学基金(61274056,61505135,11704275,11674239,61575138) 山西省自然科学基金(2015021013,2016011048) 太原理工大学引进人才项目(tyut-rc 201246a)资助项目.
关键词 有机太阳能电池 表面等离子体 光栅 吸收效率 organic solar cells surface plasmon resonance grating absorption efficiency
作者简介 刘欣(1984-)博士,主要从事表面等离激元在微纳光电子器件等光耦合结构中的激发和应用研究,E-mail:xinliu419@gmail.com.
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