Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Electrical Characteristics of the Packaged SiGe Hetero-Junction Bipolar Transistors Fabricated with Various Conditions of the Collector Formation

패키지된 실리콘-게르마늄 이종접합 바이폴라 트랜지스터의 콜렉터 형성 조건에 따른 전기적 특성

  • Lee, Seung-Yun (SiGe Devices Team, Electronics and Telecommunications Research Institute(ETRI)) ;
  • Lee, Sang-Heung (SiGe Devices Team, Electronics and Telecommunications Research Institute(ETRI)) ;
  • Kim, Hong-Seung (SiGe Devices Team, Electronics and Telecommunications Research Institute(ETRI)) ;
  • Park, Chan-U (SiGe Devices Team, Electronics and Telecommunications Research Institute(ETRI)) ;
  • Kim, Sang-Hun (SiGe Devices Team, Electronics and Telecommunications Research Institute(ETRI)) ;
  • Lee, Ja-Yeol (SiGe Devices Team, Electronics and Telecommunications Research Institute(ETRI)) ;
  • Sim, Gyu-Hwan (SiGe Devices Team, Electronics and Telecommunications Research Institute(ETRI)) ;
  • Gang, Jin-Yeong (SiGe Devices Team, Electronics and Telecommunications Research Institute(ETRI))
  • 이승윤 (한국전자통신연구원 SiGe 소자팀) ;
  • 이상흥 (한국전자통신연구원 SiGe 소자팀) ;
  • 김홍승 (한국전자통신연구원 SiGe 소자팀) ;
  • 박찬우 (한국전자통신연구원 SiGe 소자팀) ;
  • 김상훈 (한국전자통신연구원 SiGe 소자팀) ;
  • 이자열 (한국전자통신연구원 SiGe 소자팀) ;
  • 심규환 (한국전자통신연구원 SiGe 소자팀) ;
  • 강진영 (한국전자통신연구원 SiGe 소자팀)
  • Published : 2002.06.01
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Abstract

The effects of the conditions of the collector formation on electrical characteristics of the packaged SiGe hetero-junction bipolar transistors (HBT) were investigated. While the DC characteristics of SiGe HBTs such as IV characteristic, forward current gain, Early voltage, and breakdown voltage were hardly changed after packaging, the AC characteristics such as $f_{\tau}\; and\; f_{max}$ were degraded severely. With the rise of the collector concentration, the break-down voltage decreased but the $f_{\tau}$ increased. Additionally, $\beta$ and $f_{\tau}$ values were kept high in the range of elevated collector current due to the increase of the critical current density for the onset of the Kirk effect. The devices As implanted before the collector deposition showed lower breakdown voltage and higher $f_{\tau}$ than the others, which seems to be originated from the As up-diffusion resulting in the thinner collector.

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References

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