Observation of sharp current peaks in resonant tunneling diode with strained Si0.6Ge0.4/Si(1 0 0) grown by low-temperature low-pressure CVD

Ping Han, Masao Sakuraba, Young Cheon Jeong, Kahlheinz Bock, Takashi Matsuura, Junichi Murota

Research output: Contribution to journalConference article

17 Citations (Scopus)

Abstract

p-Type double barrier resonant tunneling diodes with high-quality strained Si0.6Ge0.4/Si heterostructures have been realized at low temperatures using the ultraclean low-pressure CVD system. In order to suppress a voltage drop due to series resistance, the diode structure has been improved with a B-doping concentration in the p+ contact layers of 1019-1020 cm-3. The sharp resonant current peaks have been observed from the I-V characteristics in the temperature range of 10-200 K. The peak-to-valley current ratio is as high as 2.9 at 120 K. The peak voltage decreased with increasing temperature and hovered around extremely low values with a minimum value of 8 mV at 200 K. The decrease of the peak voltage can be explained mainly by the decrease of the resonant state energy of heavy holes in the quantum well due to the increase of the hole effective mass, and by the increase of the peak energy of the hole distribution in the emitter. A sudden drop of the peak voltage was found at 110-120 K, and possible processes affecting the observed tunneling characteristics are discussed.

Original languageEnglish
Pages (from-to)315-320
Number of pages6
JournalJournal of Crystal Growth
Volume209
Issue number2-3
DOIs
Publication statusPublished - 2000 Feb
EventThe 7th International Conference on Chemical Beam Epitaxy and Related Growth Techniques - Tsukuba, Jpn
Duration: 1999 Jul 281999 Jul 30

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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