A simplified GaN/AlGaN quantum cascade detector with an alloy extractor

作者:Sakr S*; Giraud E; Tchernycheva M; Isac N; Quach P; Warde E; Grandjean N; Julien F H
来源:Applied Physics Letters, 2012, 101(25): 251101.
DOI:10.1063/1.4772501

摘要

We have demonstrated a GaN/AlGaN quantum cascade detector based on a simplified design of the extractor region relying on an AlGaN thick layer. The device grown by molecular beam epitaxy exhibits both TM-polarized intersubband absorption and photocurrent at room temperature at a peak wavelength of 1.87 mu m. Based on the measured absorption and responsivity, we estimate the transfer efficiency of photoelectrons to the next period to be around 62%. This simplified design is robust against thickness fluctuations in the extractor region and offers prospects for ultrafast detectors.

  • 出版日期2012-12-17