Publications [#66838] of Adrienne D. Stiff-Roberts

Papers Published

1. Su, X.H. and Stiff-Roberts, A.D. and Chakrabarti, S. and Singh, J. and Bhattacharya, P., Resonant tunneling quantum dot infrared photodetector (RT-QDIP): Separating dark current and photocurrent, Device Research Conference - Conference Digest, DRC (2004), pp. 81 - 82, Notre Dame, IN, United States
   (last updated on 2007/04/16)

   Abstract:
   The reduction of dark current in quantum dot (QD) infrared photodetectors (QDIP), which uses resonant tunneling (RT) barriers to selectively block dark current while transmitting photocurrent, was investigated. A heterostructure design for such a RT-QDIP comprising ten InAs/GaAs QD layers was used for investigation. An RT-QDIP and a conventional QDIP were grown and fabricated to compare the dark current in both devices. It was observed that the reduction in dark current due to the RT design is approximately 10² and is the lowest measured dark current in a QDIP at these temperatures. The results show that the new QDIP design should provide a significant improvement in QDIP performance by reducing dark current for high-temperature operation.

   Keywords:
   Semiconductor quantum dots;Photocurrents;Semiconducting indium compounds;Semiconducting gallium arsenide;Heterojunctions;Photons;Electric potential;Current voltage characteristics;Electric current measurement;Light absorption;Probability;Molecular beam epitaxy;