Data · dataset · 2026
TEM studies of III-V metamorphic buffer architectures for laser applications
Listed in ZivaHub and Deakin Research Online and DMU Figshare — shown once because both records carry DOI 10.17034/32640234.v1
This study explores different In<sub>x</sub>Ga<sub>1-x</sub>As metamorphic buffer (MB) architectures grown on GaAs and InP substrates via Metal Organic Vapour Phase Epitaxy (MOVPE), focusing on physical factors that affect laser performance.
Description
The research examines chemical composition, strain, and dislocation distribution in MBs, with localized bandgap (Eg) measurements in In<sub>x</sub>Ga<sub>1-x</sub>As Quantum Wells (QWs) using transmission electron microscopy (TEM).<br><br>Strain mapping in MBs on GaAs substrates with various designs, including In<sub>0.66</sub>Ga<sub>0.34</sub>P films and Al<sub>x</sub>In<sub>y</sub>Ga<sub>1-x-y</sub>As/In<sub>x</sub>Ga<sub>1-x</sub>P superlattices, shows dislocation densities between 10<sup>8</sup> cm⁻² and 10<sup>10</sup> cm⁻².
Samples with superlattices have higher dislocation densities despite similar MB designs, likely due to growth process differences. Threading dislocations (TDs) are found deeper in the MB (~200–300 nm) than misfit dislocations (MDs). Strain mapping aligns with theoretical models, indicating higher strain in the growth direction (εyy) than in-plane (εxx).<br><br>InP substrates show higher dislocation densities and a smaller distance between TDs and MDs compared to GaAs samples.
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These findings provide insight into strain relaxation strategies for metamorphic lasers.<br><br>Electron energy loss spectroscopy (EELS) reveals bandgap variations in QWs, while energy dispersive X-ray (EDX) and strain mapping highlight the interplay between strain, composition, and Eg. This offers fundamental insights for improving the electronic and optical properties of metamorphic laser structures on different substrates.<br>
Links
Where it is published
- DOI doi.org/10.17034/32640234.v1 ↗
DOI / persistent id · from zivahub uct ac za
Catalogue records · 1
- OAI-PMH record api.figshare.com/v2/oai?verb=GetRecord&metadataPrefix=oai_dc&identifier=oai%3Af… ↗
metadata API · from zivahub uct ac za
Topics
- From keywords
- Earth & Environmental Science · Earth & Environmental Science · Earth & Environmental Science · Energy · Energy · Energy
- Inferred from text
- Microscopy 75%
Provenance · 3 source records, 11 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| ZivaHub | oai:figshare.com:article/32640234 | 13 d ago | JSON v1 |
| Deakin Research Online | oai:figshare.com:article/32640234 | 13 d ago | JSON v1 |
| DMU Figshare | oai:figshare.com:article/32640234 | 13 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| concepts[field].local:field:earth-environmental | mapping · dro deakin edu au | connector:dro_deakin_edu_au@1.0.0 | |
| concepts[field].local:field:earth-environmental | mapping · figshare dmu ac uk | connector:figshare_dmu_ac_uk@1.0.0 | |
| concepts[field].local:field:earth-environmental | mapping · zivahub uct ac za | connector:zivahub_uct_ac_za@1.0.0 | |
| concepts[field].local:field:energy | mapping · figshare dmu ac uk | connector:figshare_dmu_ac_uk@1.0.0 | |
| concepts[field].local:field:energy | mapping · dro deakin edu au | connector:dro_deakin_edu_au@1.0.0 | |
| concepts[field].local:field:energy | mapping · zivahub uct ac za | connector:zivahub_uct_ac_za@1.0.0 | |
| concepts[modality].local:modality:microscopy | enrichment · zivahub uct ac za | keyword-concept-rules@1.0.0 | title+description (75%) |
| description | source · zivahub uct ac za | connector:zivahub_uct_ac_za@1.0.0 | /metadata/dc/description |
| license_text | source · zivahub uct ac za | connector:zivahub_uct_ac_za@1.0.0 | |
| publication_date | source · zivahub uct ac za | connector:zivahub_uct_ac_za@1.0.0 | |
| title | source · zivahub uct ac za | connector:zivahub_uct_ac_za@1.0.0 | /metadata/dc/title |