Open AccessCarrier trapping and confinement in Ge nanocrystals surrounded by Ge3N4
Author(s) -
Young S. Park,
Christopher C. S. Chan,
Benjamin P. L. Reid,
Luke Nuttall,
Robert A. Taylor,
Nam Suk Lee,
Young Mi Lee
Publication year - 2016
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/srep25449
Subject(s) - photoluminescence , nanocrystal , trapping , materials science , germanium , infrared , optoelectronics , crystal (programming language) , nanotechnology , optics , physics , silicon , computer science , programming language , ecology , biology
We investigated the optical properties of Ge nanocrystals surrounded by Ge 3 N 4 . The broad emission ranging from infrared to blue is due to the dependence on the crystal size and preparation methods. Here, we report high resolution Photoluminescence (PL) attributed to emission from individual Ge nanocrystals ( nc -Ge) spatially resolved using micro-photoluminescence and detailed using temperature and power-dependent photoluminescence studies. The measured peaks are shown to behave with excitonic characteristics and we argue that the spread of the nc -Ge peaks in the PL spectrum is due to different confinement energies arising from the variation in size of the nanocrystals.