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InP/InGaAs double heterojunction bipolar transistors with BVCEO = 12 V and fmax = 470 GHz.

Authors :
Kashio, N.
Kurishima, K.
Ida, M.
Matsuzaki, H.
Source :
Electronics Letters (Wiley-Blackwell). 4/16/2015, Vol. 51 Issue 8, p648-649. 2p. 1 Diagram, 2 Graphs.
Publication Year :
2015

Abstract

0.25 μm emitter InP/InGaAs double heterojunction bipolar transistors (DHBTs) are presented that simultaneously exhibit a high collector current density (Jc) of more than 3 mA/μm2 and high breakdown voltage (BVCEO) of 12 V. The DHBTs consist of a 30 nm-thick InGaAs base, 250 nm-thick InGaAs/InAlGaAs/InP collector and 150 nm-thick n-doped InP field buffer. Since the doping level of the InP field buffer is relatively high, only the InGaAs/InAlGaAs/InP collector is depleted at low VCE. Thus, the DHBTs can provide ft = 173 GHz and fmax = 470 GHz at Jc = 3.5 mA/μm2. On the other hand, at a high VCE, both the InGaAs/InAlGaAs/InP collector and InP field buffer are depleted. Therefore, the effective depletion thickness increases, which results in a BVCEO of 12 V. These results indicate that the use of the InP field buffer provides both high-speed performance and high BVCEO. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00135194
Volume :
51
Issue :
8
Database :
Academic Search Index
Journal :
Electronics Letters (Wiley-Blackwell)
Publication Type :
Academic Journal
Accession number :
102023601
Full Text :
https://doi.org/10.1049/el.2014.4503