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Correlation between Photoreflectance Spectra and Electrical Characteristics of InP/GaAsSb Double Heterojunction Bipolar Transistors

Published online by Cambridge University Press:  26 February 2011

Hiroki Sugiyama ,
Yasuhiro Oda ,
Haruki Yokoyama ,
Takashi Kobayashi ,
Masahiro Uchida  and
Noriyuki Watanabe
Hiroki Sugiyama
Affiliation:
NTT Photonics Laboratories, NTT Corporation, 3–1 Morinosato Wakamiya, Atsugi-shi, Kanagawa 243–0198, Japan
Yasuhiro Oda
Affiliation:
NTT Photonics Laboratories, NTT Corporation, 3–1 Morinosato Wakamiya, Atsugi-shi, Kanagawa 243–0198, Japan
Haruki Yokoyama
Affiliation:
NTT Photonics Laboratories, NTT Corporation, 3–1 Morinosato Wakamiya, Atsugi-shi, Kanagawa 243–0198, Japan
Takashi Kobayashi
Affiliation:
NTT Photonics Laboratories, NTT Corporation, 3–1 Morinosato Wakamiya, Atsugi-shi, Kanagawa 243–0198, Japan
Masahiro Uchida
Affiliation:
NTT Advanced Technology Corporation, 3–1 Morinosato Wakamiya, Atsugi-shi, Kanagawa 243–0198, Japan
Noriyuki Watanabe
Affiliation:
NTT Advanced Technology Corporation, 3–1 Morinosato Wakamiya, Atsugi-shi, Kanagawa 243–0198, Japan
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Abstract

We report a photoreflectance (PR) characterization of InP/GaAsSb double-heterojunction bipolar transistor (DHBT) epitaxial wafers grown by metal-organic vapor-phase epitaxy (MOVPE). The origin of the Franz-Keldysh oscillations (FKOs) in the PR spectra was identified by step etching of the samples. FKOs from the InP emitter region were observed in the wafer with low recombination forward current at the emitter-base (E/B) heterojunction. In contrast, they did not appear when recombination current was dominant. The absence of the FKOs from the emitter indicates the high concentration of the recombination centers at the E/B heterojunction. We have also measured PR spectra from InAlP/GaAsSb/InP DHBT wafers. Pronounced FKOs from InAlP emitter reflect the suppression of recombination at E/B heterojunctions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 829: Symposium B – Progress in Compound Semiconductor Materials IV – Electronic and Optoelectronic Applications , 2004 , B6.2
Copyright
Copyright © Materials Research Society 2005

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References

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