Publications [#66841] of Adrienne D. Stiff-Roberts

Papers Published

1. Stiff-Roberts, A.D. and Krishna, S. and Bhattacharya, P. and Kennerly, S., Low-bias, high-temperature performance of a normal-incidence InAs/GaAs vertical quantum-dot infrared photodetector with a current-blocking barrier, Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures, vol. 20 no. 3 (2002), pp. 1185 - 1187, Providence, RI [1.1461370]
   (last updated on 2007/04/16)

   Abstract:
   The properties of a low-bias and high-temperature InAs/GaAs vertical quantum-dot infrared photodetector (QDIP) with a single Al_0.3Ga_0.7As current-blocking barrier were investigated. This device demonstrated high peak detectivity and a high operating temperature for normal-incidence vertical QDIPs. High-temperature operations in QDIPs resulted from a large electron relaxation time from the excited states to the ground state in quantum dots, allowing excited carriers to escape from the dot and contribute to the photocurrent before relaxing back into the ground state. The low bias performance of the photodetector ensured its compatibility with commercially available silicon read-out circuits.

   Keywords:
   Infrared radiation;Semiconductor quantum dots;Semiconducting indium gallium arsenide;Molecular beam epitaxy;Photoionization;Activation energy;Thermionic emission;Electron transitions;Band structure;Ground state;Etching;Photolithography;Current voltage characteristics;High temperature operations;Fourier transform infrared spectroscopy;Scanning electron microscopy;