InAs/GaSb heterostructure nanowires for tunnel field-effect transistors.
InAs/GaSb nanowire heterostructures with thin GaInAs inserts were grown by MOVPE and characterized by electrical measurements and transmission electron microscopy. Down-scaling of the insert thickness was limited because of an observed sensitivity of GaSb nanowire growth to the presence of In. By employing growth interrupts in between the InAs and GaInAs growth steps it was possible to reach an insert thickness down to 25 nm. Two-terminal devices show a diode behavior, where temperature-dependent measurements indicate a heterostructure barrier height of 0.5 eV, which is identified as the valence band offset between the InAs and GaSb. Three-terminal transistor structures with a top-gate positioned at the heterointerface show clear indications of band-to-band tunnelling.
Borg
B Mattias
BM
Division of Solid State Physics, Lund University, Box 118, SE-221 00, Lund, Sweden. Mattias.Borg@ftf.lth.se
Dick
Kimberly A
KA
Ganjipour
Bahram
B
Pistol
Mats-Erik
ME
Wernersson
Lars-Erik
LE
Thelander
Claes
C