Enhanced photoluminescence from strained Ge-on-Insulator surface-passivated with hydrogenated amorphous Si
We study influences of the Ge-on-Insulator (GOI) fabrication and its surface passivation by deposition of a hydrogenated amorphous Si (a-Si:H) layer on light emission properties from a strained Ge. It is shown that the GOI fabrication leads to drastic enhancements of room temperature photoluminescen...
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Published in | Materials science in semiconductor processing Vol. 115; p. 105104 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
15.08.2020
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Online Access | Get full text |
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Summary: | We study influences of the Ge-on-Insulator (GOI) fabrication and its surface passivation by deposition of a hydrogenated amorphous Si (a-Si:H) layer on light emission properties from a strained Ge. It is shown that the GOI fabrication leads to drastic enhancements of room temperature photoluminescence (PL). One of the origins is elimination of a defective Ge layer inevitably formed due to strain-relaxation. We also find that the surface passivation with the a-Si:H layer can further enhance the PL intensity provided that the dopant type, p or n, of the a-Si:H matches that of the Ge. As a result, we obtain the PL intensity enhancements up to 15 times compared to as-grown Ge-on-Si, which indicates that the GOI surface-passivated with a-Si:H is a promising structure toward Ge-based high efficient light emitters on the Si platform. |
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ISSN: | 1369-8001 1873-4081 |
DOI: | 10.1016/j.mssp.2020.105104 |