Applied Science and Convergence Technology

The Korean Vacuum Society (한국진공학회)
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Optical Properties of InP/InGaP Quantum Structures Grown by a Migration Enhanced Epitaxy with Different Growth Cycles

  • Oh, Jae Won (Department of Physics, Kangwon National University) ;
  • Cho, Il-Wook (Department of Physics, Kangwon National University) ;
  • Ryu, Mee-Yi (Department of Physics, Kangwon National University) ;
  • Song, Jin Dong (Center for Opto-Electronic Convergence Systems, Korea Institute of Science and Technology)
  • Received : 2015.05.11
  • Accepted : 2015.05.28
  • Published : 2015.05.30
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Abstract

InP/InGaP quantum structures (QSs) were grown on GaAs (001) substrates by a migration-enhanced molecular beam epitaxy method. Temperature-dependent photoluminescence (PL) and emission wavelength-dependent time-resolved PL (TRPL) were performed to investigate the optical properties of InP/InGaP QSs as a function of migration enhanced epitaxy (MEE) growth cycles from 2 to 8. One cycle for the growth of InP QS consists of 2-s In and 2-s P supply with an interruption time of 10 s after each source supply. As the MEE growth cycle increases from 2 to 8, the PL peak is redshifted and exhibited different (larger, comparable, or smaller) bandgap shrinkages with increasing temperature compared to that of bulk InP. The PL decay becomes faster with increasing MEE cycles while the PL decay time increases with increasing emission wavelength. These PL and TRPL results are attributed to the different QS density and size/shape caused by the MEE repetition cycles. Therefore, the size and density of InP QSs can be controlled by changing the MEE growth cycles.

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References

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