Details
| Original language | English |
|---|---|
| Pages (from-to) | D408-D411 |
| Journal | Journal of the Electrochemical Society |
| Volume | 158 |
| Issue number | 6 |
| Publication status | Published - 22 Apr 2011 |
| Externally published | Yes |
Abstract
We demonstrate reproducible formation of mesoporous germanium layers suitable for solar energy applications by electrochemical etching in highly concentrated electrolytes. For long anodization times or thick layer formation a porosity gradient is observed leading eventually to high porosity regions and cavity formation at the bottom of the porous layer. A 30 min annealing step at a temperature of 575C in hydrogen atmosphere allows for reorganization and subsequent lift-off. The mean surface roughness increases from 0.31 nm for unprocessed Ge up to 7.85 nm for reorganized Ge as measured by atomic force microscopy. -Raman confocal spectroscopy analysis confirms that etching and annealing do not affect the crystalline structure.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Energy(all)
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
- Surfaces, Coatings and Films
- Chemistry(all)
- Electrochemistry
- Materials Science(all)
- Materials Chemistry
Sustainable Development Goals
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In: Journal of the Electrochemical Society, Vol. 158, No. 6, 22.04.2011, p. D408-D411.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Lift-off of porous germanium layers
AU - Rojas, E. Garralaga
AU - Hensen, J.
AU - Carstensen, J.
AU - Föll, H.
AU - Brendel, R.
N1 - Funding Information: The authors would like to thank Daniel Tutuc and Prof. Rolf Haug from the University of Hannover for the AFM measurements, V. Wiedemeier and G. Berth from the University Paderborn for the µ-Raman measurements, and Bianca Gehring from the ISFH for the technical assistance. The financial support of this work by the Ger- man Ministry for Economy and Technology under contract No. 50JR0641 is gratefully acknowledged. E. Garralaga Rojas specially thanks the European Space Agency for the financial support of his work in the framework of the Networking Partnering Initiative (Co. No. 20250/06/NL/GLC).
PY - 2011/4/22
Y1 - 2011/4/22
N2 - We demonstrate reproducible formation of mesoporous germanium layers suitable for solar energy applications by electrochemical etching in highly concentrated electrolytes. For long anodization times or thick layer formation a porosity gradient is observed leading eventually to high porosity regions and cavity formation at the bottom of the porous layer. A 30 min annealing step at a temperature of 575C in hydrogen atmosphere allows for reorganization and subsequent lift-off. The mean surface roughness increases from 0.31 nm for unprocessed Ge up to 7.85 nm for reorganized Ge as measured by atomic force microscopy. -Raman confocal spectroscopy analysis confirms that etching and annealing do not affect the crystalline structure.
AB - We demonstrate reproducible formation of mesoporous germanium layers suitable for solar energy applications by electrochemical etching in highly concentrated electrolytes. For long anodization times or thick layer formation a porosity gradient is observed leading eventually to high porosity regions and cavity formation at the bottom of the porous layer. A 30 min annealing step at a temperature of 575C in hydrogen atmosphere allows for reorganization and subsequent lift-off. The mean surface roughness increases from 0.31 nm for unprocessed Ge up to 7.85 nm for reorganized Ge as measured by atomic force microscopy. -Raman confocal spectroscopy analysis confirms that etching and annealing do not affect the crystalline structure.
UR - http://www.scopus.com/inward/record.url?scp=79955527619&partnerID=8YFLogxK
U2 - 10.1149/1.3583645
DO - 10.1149/1.3583645
M3 - Article
AN - SCOPUS:79955527619
VL - 158
SP - D408-D411
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
SN - 0013-4651
IS - 6
ER -