Photovoltaic enhancement due to surface-plasmon assisted visible-light absorption at the inartificial surface of lead zirconate-titanate film.
Photovoltaic enhancement due to surface-plasmon assisted visible-light absorption at the inartificial surface of lead zirconate-titanate film.
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DOI：
10.1039/c3nr05757g
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发表时间：
2014-02
期刊：
影响因子：
6.7
通讯作者：
F. Zheng;Peng Zhang;Xiaofeng Wang;Wen-Chang Huang;Jinxing Zhang;M. Shen;Wen Dong;Liang Fang;Yongbin Bai;Xiaoqin Shen;Hua Sun;J. Hao
中科院分区：
文献类型：
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作者：
F. Zheng;Peng Zhang;Xiaofeng Wang;Wen-Chang Huang;Jinxing Zhang;M. Shen;Wen Dong;Liang Fang;Yongbin Bai;Xiaoqin Shen;Hua Sun;J. Hao
采用溶胶-凝胶法在石英衬底上制备了厚度为300 nm的PZT薄膜。采用室温溅射法在PZT薄膜上沉积Pt、Au、Cu和Ag四种金属电极作为上电极。在ITO-PZT-Ag和ITO-PZT-Au结构中，PZT薄膜对可见光（400-700 nm）有部分吸收，ITO-PZT-Ag结构的最大光电转换效率提高到0.42%（100 mW cm（-2），AM 1.5G），是ITO-PZT-Pt结构的15倍左右。数值模拟表明，多晶-PZT-金属界面的自然随机粗糙度可以提供入射光子与金属表面SP耦合的可能性。计算的SP属性和测量的EQE光谱之间的重合揭示了在这些ITO-PZT-金属结构中的光伏增强的SP起源，并且改善的光电流输出是由金属表面附近的PZT区域中的增强的光吸收引起的，而不是由两种材料之间的直接电荷转移过程。
PZT film of 300 nm thickness was deposited on tin indium oxide (ITO) coated quartz by a sol-gel method. Four metal electrodes, such as Pt, Au, Cu and Ag, were used as top electrodes deposited on the same PZT film by sputtering at room temperature. In ITO-PZT-Ag and ITO-PZT-Au structures, the visible light (400-700 nm) can be absorbed partially by a PZT film, and the maximum efficiency of photoelectric conversion of the ITO-PZT-Ag structure was enhanced to 0.42% (100 mW cm(-2), AM 1.5G), which is about 15 times higher than that of the ITO-PZT-Pt structure. Numerical simulations show that the natural random roughness of polycrystalline-PZT-metal interface can offer a possibility of coupling between the incident photons and SPs at the metal surface. The coincidence between the calculated SP properties and the measured EQE spectra reveals the SP origin of the photovoltaic enhancement in these ITO-PZT-metal structures, and the improved photocurrent output is caused by the enhanced optical absorption in the PZT region near the metal surface, rather than by the direct charge-transfer process between two materials.