Ordered Arrays of Dual-Diameter Nanopillars for Maximized Optical Absorption

被引：258

作者：

Fan, Zhiyong ^{[1
,2
,3
]}

Kapadia, Rehan ^{[1
,2
,3
]}

Leu, Paul W. ^{[1
,2
,3
]}

Zhang, Xiaobo ^{[1
,2
,3
]}

Chueh, Yu-Lun ^{[1
,2
,3
]}

Takei, Kuniharu ^{[1
,2
,3
]}

Yu, Kyoungsik ^{[1
,3
]}

Jamshidi, Arash ^{[1
,3
]}

Rathore, Asghar A. ^{[1
,2
,3
]}

Ruebusch, Daniel J. ^{[1
,2
,3
]}

Wu, Ming ^{[1
,3
]}

Javey, Ali ^{[1
,2
,3
]}

机构：

[1] Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Berkeley Sensor & Actuator Ctr, Berkeley, CA 94720 USA

来源：

NANO LETTERS | 2010年 / 10卷 / 10期

关键词：

Nanopillar photonics; light management. photovoltaics; light trapping; anti-reflectivity; SILICON NANOWIRE ARRAYS; PHOTOLUMINESCENCE; PHOTODETECTION; ENHANCEMENT;

D O I：

10.1021/nl1010788

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Optical properties of highly ordered Ge nanopillar arrays are tuned through shape and geometry control to achieve the Optimal absorption efficiency Increasing the Ge materials filling ratio is shown to increase the reflectance while simultaneously decreasing the transmittance. with the absorbance showing a strong diameter dependency To enhance the broad band optical absorption efficiency. a novel dual-diameter nanopillar structure is presented, with a small diameter tip for minimal reflectance and a large diameter base for maximal effective absorption coefficient The enabled single-crystalline absorber material with a thickness of only 2 mu m exhibits an impressive absorbance of similar to 99% over wavelengths, lambda = 300-900 nm These results enable a viable and convenient route toward shape-controlled nanopillar-based high-performance photonic devices

引用

页码：3823 / 3827

页数：5

共 27 条

[1] Energy-Conversion Properties of Vapor-Liquid-Solid-Grown Silicon Wire-Array Photocathodes [J].