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- W3020852425 abstract "Fermi-level control in a polycrystalline SiGe layer is challenging, especially under a low thermal budget owing to the low activation rate of impurities and defect-induced acceptors. Here, we demonstrate the low-temperature (120–350 °C) synthesis of nanocrystalline p- and n-type Si1−xGex (x: 0–1) layers using the layer exchange technique with a Zn catalyst. Pure Zn formed p-type SiGe layers (hole concentration: 1020 cm−3 for x ≥ 0.8) due to the shallow acceptor level of Zn in Ge. Conversely, As-doped Zn allowed us to synthesize n-type SiGe layers (electron concentration: 1019 cm−3 for x ≤ 0.3) at the lowest ever temperature of 350 °C, owing to the self-organized As doping to SiGe during layer exchange. The resulting p-type Si0.2Ge0.8 and n-type Si0.85Ge0.15 layers exhibited the largest ever power factors (280 μW/mK2 for the p-type and 15 μW/mK2 for the n-type), for SiGe fabricated on a flexible plastic sheet. The low-temperature synthesis technology, for both p- and n-type SiGe layers, opens up the possibility of developing human-friendly, highly reliable, flexible devices including thermoelectric sheets." @default.
- W3020852425 created "2020-05-13" @default.
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- W3020852425 date "2020-05-04" @default.
- W3020852425 modified "2023-10-14" @default.
- W3020852425 title "Zn-induced layer exchange of p- and n-type nanocrystalline SiGe layers for flexible thermoelectrics" @default.
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- W3020852425 doi "https://doi.org/10.1063/5.0006958" @default.
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