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Ivan Scheblykin. Portrait.

Ivan Scheblykin

Professor

Ivan Scheblykin. Portrait.

Time-resolved photoluminescence studies of single interface wurtzite/zincblende heterostructured InP nanowires

Author

  • Asmita Jash
  • Aymen Yangui
  • Sebastian Lehmann
  • Ivan G. Scheblykin
  • Kimberly A. Dick
  • Anders Gustafsson
  • Mats-erik Pistol

Summary, in English

The interface between wurtzite and zinc blende InP has been identified as type-II, where electrons gather on the zinc blende side and holes on the wurtzite side of the interface. The photoluminescence resulting from recombination across the interface is expected to be long-lived and to exhibit non-exponential decay of emission intensity after pulsed excitation. We verify this prediction using time-resolved photoluminescence spectroscopy on nanowires containing a single heterostructure between a single segment of wurtzite and zinc blende. We find that a significant intensity of type-II emission remains even more than 30 ns after excitation. The decay of the emission intensity is also non-exponential and considerably longer than the exponential decay of the wurtzite InP segment (260 ps). Our results are consistent with the expected photoluminescence characteristics of a type-II interface between the two polytypes. We also find that the lifetime becomes shorter if we create an electron gas at the interface by n-type doping the entire wurtzite segment of the nanowire. This is expected since there are many electrons that a given hole can recombine with, in contrast to the undoped case.

Department/s

  • NanoLund: Centre for Nanoscience
  • Solid State Physics
  • Chemical Physics
  • Centre for Analysis and Synthesis

Publishing year

2022-03-14

Language

English

Publication/Series

Applied Physics Letters

Volume

120

Issue

11

Document type

Journal article

Publisher

American Institute of Physics (AIP)

Topic

  • Condensed Matter Physics (including Material Physics, Nano Physics)
  • Nano-technology

Status

Published

ISBN/ISSN/Other

  • ISSN: 0003-6951