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Unipolar and bipolar operation of InAs/InSb nanowire heterostructure field-effect transistors

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6 Author(s)
Nilsson, Henrik A. ; Division of Solid State Physics, Lund University, Box 118, S-22100 Lund, Sweden ; Caroff, Philippe ; Lind, Erik ; Pistol, Mats-Erik
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We present temperature dependent electrical measurements on n-type InAs/InSb nanowire heterostructure field-effect transistors. The barrier height of the heterostructure junction is determined to be 220 meV, indicating a broken bandgap alignment. A clear asymmetry is observed when applying a bias to either the InAs or the InSb side of the junction. Impact ionization and band-to-band tunneling is more pronounced when the large voltage drop occurs in the narrow bandgap InSb segment. For small negative gate-voltages, the InSb segment can be tuned toward p-type conduction, which induces a strong band-to-band tunneling across the heterostructucture junction.

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Journal of Applied Physics  (Volume:110 ,  Issue: 6 )