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PbS量子点/ZnO纳米线共混太阳能电池的效率增强通过等离子体银纳米立方体

Efficiency Enhancement of PbS Quantum Dot/ZnO Nanowire Bulk-Heterojunction Solar Cells by Plasmonic Silver Nanocubes

作者：Tokuhisa Kawawaki;Haibin Wang;Takaya Kubo;Koichiro Saito;Jotaro Nakazaki;Hiroshi Segawa;Tetsu Tatsuma;

关键词：colloidal quantum dot,bulk-heterojunction solar cell,localized surface plasmon resonance,silver nanocube

DOI：https://doi.org/10.1021/acsnano.5b00321

发表时间：2015年

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摘要

为了提高太阳能电池的性能，重要的是要有效利用近红外光，这占阳光能量的∼40%。在这里，我们在胶体PbS量子点/ZnO纳米线（PbS QD/ZnO NW）的混合异质结太阳能电池中引入等离子Ag纳米立方体（NCs），这些电池具有高光电流，以进一步提高可见光和近红外区域的光电流和功率转换效率（PCE）。Ag NCs在PbS QDs的光吸收相对较弱的波长区域具有强远场散射和强光学近场。太阳能电池的光电流特别在700-1200 nm范围内由于光吸收的等离子增强和可能的子激子解离而得到增强。通过优化Ag NCs的位置和数量，PbS QD/ZnO NW混合异质结太阳能电池的PCE从4.45%提高到6.03%，提高了1.36倍。


Abstract

For improvement of solar cell performance, it is important to make efficient use of near-infrared light, which accounts for ∼40% of sunlight energy. Here we introduce plasmonic Ag nanocubes (NCs) to colloidal PbS quantum dot/ZnO nanowire (PbS QD/ZnO NW) bulk-heterojunction solar cells, which are characterized by high photocurrents, for further improvement in the photocurrent and power conversion efficiency (PCE) in the visible and near-infrared regions. The Ag NCs exhibit strong far field scattering and intense optical near field in the wavelength region where light absorption of PbS QDs is relatively weak. Photocurrents of the solar cells are enhanced by the Ag NCs particularly in the range 700–1200 nm because of plasmonic enhancement of light absorption and possible facilitation of exciton dissociation. As a result of the optimization of the position and amount of Ag NCs, the PCE of PbS QD/ZnO NW bulk-heterojunction solar cells is improved from 4.45% to 6.03% by 1.36 times.


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