Abstract
We have investigated lateral conduction mid-infrared photodetectors using the photoionization of holes in the valence band of self-assembled Ge/Si quantum dots. A mid-infrared photocurrent signal was observed in the photon energy range of 140-400 meV resulting from an intersubband transition in the valence band of self-assembled Ge quantum dots and subsequent lateral transport of photoexcited carriers in the SiGe conduction channel. The peak responsivity was 134 mA W-1 at a photon energy of 240 meV at T = 10 K. Furthermore, the band structure of the Ge QD system was estimated using electrical and optical measurements.
Original language | English |
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Article number | 105403 |
Journal | Nanotechnology |
Volume | 18 |
Issue number | 10 |
DOIs | |
State | Published - 14 Mar 2007 |