Publications [#66833] of Adrienne D. Stiff-Roberts

Papers Published

1. Stiff-Roberts, Adrienne D. and Chakrabarti, Subhananda and Xiaohua, S.U. and Bhattacharya, Pallab, Research propels quantum dots forward, Laser Focus World, vol. 41 no. 5 (2005), pp. 103 - 108
   (last updated on 2007/04/16)

   Abstract:
   The challenges faced by the quantum-dot IR photodetectors (QDIP), which are well-suited for detecting mid-IR light at elevated temperatures, are discussed. The quantum-mechanical nature of the QD for IR photodetectors allows normal-incidence detection, large excited-state electron relaxation times for increased detector efficiency, several tuning parameters for controlling optoelectronic properties, and low dark currents for HOT IR photodetection. Electrons can be introduced in the QD by direct doping, modulation doping, or capture of injected electrons from the device contact. However, it is a challenge to control this dopant incorporation during the Stranski-Krastanow (S-K) growth, used to synthesize active-region heterostructures such as QDs.

   Keywords:
   Infrared detectors;Infrared imaging;Mercury compounds;Semiconducting gallium arsenide;Light amplifiers;Synthesis (chemical);Crystal growth;Ultrahigh vacuum;Ground state;Modulation;Photodiodes;