Extended Defect Propagation in Highly Tensile-Strained Ge Waveguides
AbstractTensile-strained Ge is a possible laser material for Si integrated circuits, but reports of lasers using tensile Ge show high threshold current densities and short lifetimes. To study the origins of these shortcomings, Ge ridge waveguides with tensile strain in three dimensions were fabricated using compressive silicon nitride (SiNx) films with up to 2 GPa stress as stress liners. A Raman peak shift of up to 11 cm−1 was observed, corresponding to 3.6% hydrostatic tensile strain for waveguides with a triangular cross-section. Real time degradation in tensile-strained Ge was observed and studied under transmission electron microscopy (TEM). A network of defects, resembling dark line defects, was observed to form and propagate with a speed and density strongly correlated with the local strain extracted from both modeled and measured strain profiles. This degradation suggests highly tensile-strained Ge lasers are likely to have significantly shorter lifetime than similar GaAs or InGaAs quantum well lasers. View Full-Text
- Supplementary File 1:
PDF-Document (PDF, 268 KB)
Scifeed alert for new publicationsNever miss any articles matching your research from any publisher
- Get alerts for new papers matching your research
- Find out the new papers from selected authors
- Updated daily for 49'000+ journals and 6000+ publishers
- Define your Scifeed now
Qi, M.; O’Brien, W.A.; Stephenson, C.A.; Patel, V.; Cao, N.; Thibeault, B.J.; Schowalter, M.; Rosenauer, A.; Protasenko, V.; Xing, H.G.; Wistey, M.A. Extended Defect Propagation in Highly Tensile-Strained Ge Waveguides. Crystals 2017, 7, 157.
Qi M, O’Brien WA, Stephenson CA, Patel V, Cao N, Thibeault BJ, Schowalter M, Rosenauer A, Protasenko V, Xing HG, Wistey MA. Extended Defect Propagation in Highly Tensile-Strained Ge Waveguides. Crystals. 2017; 7(6):157.Chicago/Turabian Style
Qi, Meng; O’Brien, William A.; Stephenson, Chad A.; Patel, Victor; Cao, Ning; Thibeault, Brian J.; Schowalter, Marco; Rosenauer, Andreas; Protasenko, Vladimir; Xing, Huili G.; Wistey, Mark A. 2017. "Extended Defect Propagation in Highly Tensile-Strained Ge Waveguides." Crystals 7, no. 6: 157.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.