IEICE TRANSACTIONS on Electronics
DC and AC Performances in Selectively Grown SiGe-Base HBTs
Summary :
A selectively grown Si1-xGex base heterojunction bipolar transistor (HBT) was fabricated, and effects of Ge and B profiles on the device performance were investigated. Since no obvious leakage current was observed, it is shown that good crystallinity of Si1-xGex was achieved by using a UHV/CVD system with high-pressure H2 pre-cleaning of the substrate. Very high current gain of 29,000 was obtained in an HBT with a uniform Ge profile by both increasing electron injection from the emitter to the base and reducing band gap energy in the base. Since the Early voltage is affected by the grading of Ge content in the base, the HBT with the graded Ge profile provides very high Early voltage. However, the breakdown voltage is degraded by increasing Ge content because of reducing bandgap energy and changing dopant profile. To increase the cutoff frequency, dopant diffusion must be suppressed, and carrier acceleration by the internal drift field with the graded Ge profile has an additional effect. By doing them, an extremely high cutoff frequency of 130 GHz was obtained in HBT with graded Ge profiles.
- Publication
- IEICE TRANSACTIONS on Electronics Vol.E82-C No.11 pp.2013-2020
- Publication Date
- 1999/11/25
- Publicized
- Online ISSN
- DOI
- Type of Manuscript
- Special Section PAPER (Special Issue on High-Frequency/High-Speed Devices for Information and Communication Systems in the 21st Century)
- Category
- Low Power-Consumption RF ICs
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Katsuya ODA, Eiji OHUE, Masamichi TANABE, Hiromi SHIMAMOTO, Katsuyoshi WASHIO, "DC and AC Performances in Selectively Grown SiGe-Base HBTs" in IEICE TRANSACTIONS on Electronics,
vol. E82-C, no. 11, pp. 2013-2020, November 1999, doi: .
Abstract: A selectively grown Si1-xGex base heterojunction bipolar transistor (HBT) was fabricated, and effects of Ge and B profiles on the device performance were investigated. Since no obvious leakage current was observed, it is shown that good crystallinity of Si1-xGex was achieved by using a UHV/CVD system with high-pressure H2 pre-cleaning of the substrate. Very high current gain of 29,000 was obtained in an HBT with a uniform Ge profile by both increasing electron injection from the emitter to the base and reducing band gap energy in the base. Since the Early voltage is affected by the grading of Ge content in the base, the HBT with the graded Ge profile provides very high Early voltage. However, the breakdown voltage is degraded by increasing Ge content because of reducing bandgap energy and changing dopant profile. To increase the cutoff frequency, dopant diffusion must be suppressed, and carrier acceleration by the internal drift field with the graded Ge profile has an additional effect. By doing them, an extremely high cutoff frequency of 130 GHz was obtained in HBT with graded Ge profiles.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e82-c_11_2013/_p
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@ARTICLE{e82-c_11_2013,
author={Katsuya ODA, Eiji OHUE, Masamichi TANABE, Hiromi SHIMAMOTO, Katsuyoshi WASHIO, },
journal={IEICE TRANSACTIONS on Electronics},
title={DC and AC Performances in Selectively Grown SiGe-Base HBTs},
year={1999},
volume={E82-C},
number={11},
pages={2013-2020},
abstract={A selectively grown Si1-xGex base heterojunction bipolar transistor (HBT) was fabricated, and effects of Ge and B profiles on the device performance were investigated. Since no obvious leakage current was observed, it is shown that good crystallinity of Si1-xGex was achieved by using a UHV/CVD system with high-pressure H2 pre-cleaning of the substrate. Very high current gain of 29,000 was obtained in an HBT with a uniform Ge profile by both increasing electron injection from the emitter to the base and reducing band gap energy in the base. Since the Early voltage is affected by the grading of Ge content in the base, the HBT with the graded Ge profile provides very high Early voltage. However, the breakdown voltage is degraded by increasing Ge content because of reducing bandgap energy and changing dopant profile. To increase the cutoff frequency, dopant diffusion must be suppressed, and carrier acceleration by the internal drift field with the graded Ge profile has an additional effect. By doing them, an extremely high cutoff frequency of 130 GHz was obtained in HBT with graded Ge profiles.},
keywords={},
doi={},
ISSN={},
month={November},}
Copy
TY - JOUR
TI - DC and AC Performances in Selectively Grown SiGe-Base HBTs
T2 - IEICE TRANSACTIONS on Electronics
SP - 2013
EP - 2020
AU - Katsuya ODA
AU - Eiji OHUE
AU - Masamichi TANABE
AU - Hiromi SHIMAMOTO
AU - Katsuyoshi WASHIO
PY - 1999
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E82-C
IS - 11
JA - IEICE TRANSACTIONS on Electronics
Y1 - November 1999
AB - A selectively grown Si1-xGex base heterojunction bipolar transistor (HBT) was fabricated, and effects of Ge and B profiles on the device performance were investigated. Since no obvious leakage current was observed, it is shown that good crystallinity of Si1-xGex was achieved by using a UHV/CVD system with high-pressure H2 pre-cleaning of the substrate. Very high current gain of 29,000 was obtained in an HBT with a uniform Ge profile by both increasing electron injection from the emitter to the base and reducing band gap energy in the base. Since the Early voltage is affected by the grading of Ge content in the base, the HBT with the graded Ge profile provides very high Early voltage. However, the breakdown voltage is degraded by increasing Ge content because of reducing bandgap energy and changing dopant profile. To increase the cutoff frequency, dopant diffusion must be suppressed, and carrier acceleration by the internal drift field with the graded Ge profile has an additional effect. By doing them, an extremely high cutoff frequency of 130 GHz was obtained in HBT with graded Ge profiles.
ER -
English
