ABSTRACT
Shinichi Fujimoto and Kazuhiko Hlrakawa IIS, University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8508, Japan
Abstract. We report on photocurrent spectra of Be-doped p-type modulation-doped quantum dot infrared photodetector structure. We have observed a broad photocurrent signal in a photon energy range of 100-400 meV (wavelength range of 3-10 pm) due to bound-tocontinuum intersubband absorption of normal incidence radiation in the valence band of InAs self-assembled quantum dots, showing a peak sensitivity around hv= 190 meV. Furthermore, the observed responsivity was as high as 16 AAV at T = 10 K, which is to our knowledge, the highest value ever reported for quantum dot infrared photodetectors.
