@article{Han2015, 
author = {Qi Han and Yongqi Fu and Lei Jin and Jingjing Zhao and Zongwei Xu and Fengzhou Fang and Jingsong Gao and Weixing Yu},
title = {Germanium nanopyramid arrays showing near-100% absorption in the visible regime},
year = {2015},
journal = {Nano Research},
volume = {8},
number = {7},
pages = {2216-2222},
keywords = {nanopyramid array, absorption coefficient, antireflection coatings, slow-light mode},
url = {https://www.sciopen.com/article/10.1007/s12274-015-0731-0},
doi = {10.1007/s12274-015-0731-0},
abstract = {Solar energy is regarded as one of the most plentiful sources of renewable energy. An extraordinary light-harvesting property of a germanium periodic nanopyramid array is reported in this Letter. Both our theoretical and experimental results demonstrate that the nanopyramid array can achieve perfect broadband absorption from 500- to 800-nm wavelength. Especially in the visible regime, the experimentally measured absorption can even reach 100%. Further analyses reveal that the intrinsic antireflection effect and slow-light waveguide mode play an important role in the ultra-high absorption, which is helpful for the research and development of photovoltaic devices.}
}