Fang Wenruo, Hu Pan, Wu Zhenqiu, Xiao Youfeng, Sui Yunxia, Pan Dalong, Su Guangxu, Zhu Mingwei, Zhan Peng, Liu Fanxin, Wu Wei
Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, People's Republic of China.
Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, United States of America.
Nanotechnology. 2021 Jun 9;32(35). doi: 10.1088/1361-6528/ac04d2.
Plasmonic nanostructures are successfully demonstrated in solar cells due to their broad spectra-selective resonance in the range of ultraviolet to near-infrared, and thus light absorption can be mostly improved and power conversion efficiency (PCE) further. Here, we demonstrate plasmonic dye-sensitized solar cells (DSSCs) using collapsible Au nanofingers to build photoanode to enhance light absorption. In this plasmonic DSSCs, by balancing local field enhancement due to gap-plasmon resonance and dye fluorescence quenching, the optimal gap size in collapsed Au/AlO/Au nanofingers is designed by twice the AlOthickness and then deposited a TiOlayer as photoanode. The results show that the PCE of DSSCs is mostly improved as compared to DSSCs with photoanode of Au/AlO/TiOfilms, which can be ascribed to the coupled local field enhancement within the sub-nanometer gaps. In addition, fluorescence of dyes on plasmonic nanofingers is nearly 10 times higher than plain Au/AlO/TiOfilms, which further proves the dye absorption enhancement. These plasmonic nanofingers enable the precise engineering of gap-plasmon modes and can be scaled up to wafer scale with low cost by the nanoimprint lithography technique, which suggests the feasibility of applying our result in constructing the photoanode for other types of solar cells.
由于等离子体纳米结构在紫外到近红外范围内具有宽光谱选择性共振，因此在太阳能电池中得到了成功展示，从而可以极大地提高光吸收并进一步提高功率转换效率（PCE）。在此，我们展示了使用可折叠金纳米指构建光阳极以增强光吸收的等离子体染料敏化太阳能电池（DSSC）。在这种等离子体DSSC中，通过平衡间隙等离子体共振引起的局部场增强和染料荧光猝灭，将塌陷的Au/AlO/Au纳米指中的最佳间隙尺寸设计为AlO厚度的两倍，然后沉积TiO层作为光阳极。结果表明，与具有Au/AlO/TiO薄膜光阳极的DSSC相比，DSSC的PCE有了很大提高，这可归因于亚纳米间隙内耦合的局部场增强。此外，等离子体纳米指上染料的荧光比普通的Au/AlO/TiO薄膜高近10倍，这进一步证明了染料吸收的增强。这些等离子体纳米指能够精确设计间隙等离子体模式，并且可以通过纳米压印光刻技术低成本扩大到晶圆规模，这表明将我们的结果应用于构建其他类型太阳能电池的光阳极是可行的。
