Black GE based on crystalline/amorphous core/shell nanoneedle arrays
Abstract
Direct growth of black Ge on low-temperature substrates, including plastics and rubber is reported. The material is based on highly dense, crystalline/amorphous core/shell Ge nanoneedle arrays with ultrasharp tips (.about.4 nm) enabled by the Ni catalyzed vapor-solid-solid growth process. Ge nanoneedle arrays exhibit remarkable optical properties. Specifically, minimal optical reflectance (<1%) is observed, even for high angles of incidence (.about.75.degree.) and for relatively short nanoneedle lengths (.about.1 .mu.m). Furthermore, the material exhibits high optical absorption efficiency with an effective band gap of .about.1 eV. The reported black Ge can have important practical implications for efficient photovoltaic and photodetector applications on nonconventional substrates.
- Inventors:
- Issue Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1127081
- Patent Number(s):
- 8664095
- Application Number:
- 13/332,743
- Assignee:
- The Regents of the University of California (Oakland, CA)
- Patent Classifications (CPCs):
-
B - PERFORMING OPERATIONS B82 - NANOTECHNOLOGY B82Y - SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01L - SEMICONDUCTOR DEVICES
- DOE Contract Number:
- AC02-05CH11231
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Javey, Ali, Chueh, Yu-Lun, and Fan, Zhiyong. Black GE based on crystalline/amorphous core/shell nanoneedle arrays. United States: N. p., 2014.
Web.
Javey, Ali, Chueh, Yu-Lun, & Fan, Zhiyong. Black GE based on crystalline/amorphous core/shell nanoneedle arrays. United States.
Javey, Ali, Chueh, Yu-Lun, and Fan, Zhiyong. Tue .
"Black GE based on crystalline/amorphous core/shell nanoneedle arrays". United States. https://www.osti.gov/servlets/purl/1127081.
@article{osti_1127081,
title = {Black GE based on crystalline/amorphous core/shell nanoneedle arrays},
author = {Javey, Ali and Chueh, Yu-Lun and Fan, Zhiyong},
abstractNote = {Direct growth of black Ge on low-temperature substrates, including plastics and rubber is reported. The material is based on highly dense, crystalline/amorphous core/shell Ge nanoneedle arrays with ultrasharp tips (.about.4 nm) enabled by the Ni catalyzed vapor-solid-solid growth process. Ge nanoneedle arrays exhibit remarkable optical properties. Specifically, minimal optical reflectance (<1%) is observed, even for high angles of incidence (.about.75.degree.) and for relatively short nanoneedle lengths (.about.1 .mu.m). Furthermore, the material exhibits high optical absorption efficiency with an effective band gap of .about.1 eV. The reported black Ge can have important practical implications for efficient photovoltaic and photodetector applications on nonconventional substrates.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Mar 04 00:00:00 EST 2014},
month = {Tue Mar 04 00:00:00 EST 2014}
}