Structural and optical properties of lateral composition modulation in (GaP)n/(InP)n short-period superlattice

Jin Dong Song, Jong Min Kim, Young Woo Ok, Tae Yeon Seong, Yong Tak Lee

Research output: Contribution to journalConference article

4 Citations (Scopus)

Abstract

The structural and optical properties of lateral composition modulation (LCM) in (InP)n/(GaP)n short-period superlattice grown by molecular beam epitaxy were studied with transmission electron microscopy (TEM) and photoluminescence (PL) at the growth temperature (Tg) of 425 and 490 for n = 1, 1.7, and 2. LCM occurs only in a [1 -1 0] direction at Tg = 490 °C for n = 1 and 2. On the contrary, LCM occurs both in [1 -1 0] and [1 1 0] directions, parallel to [1 0 0] direction, at Tg ≥ 425 °C for n = 1.7. This is due to the stronger induction of LCM in tensile strain (∼ -10% for n = 1.7) than in compressive strain (∼ 6% for n = 1 and 2). The 9 K-PL measurements show that the LCM experiences the reduction of bandgap up to ∼ 345 meV as both n and Tg increase. This is the best data ever reported so far. The origin of bandgap shrinkage is mainly attributed to LCM along with the contribution of CuPt-type ordering.

Original languageEnglish
Pages (from-to)549-551
Number of pages3
JournalConference Proceedings - International Conference on Indium Phosphide and Related Materials
Publication statusPublished - 2002
Externally publishedYes
Event14th Indium Phosphide and Related Materials Conference - Stockholm, Sweden
Duration: 2002 May 122002 May 16

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Structural and optical properties of lateral composition modulation in (GaP)<sub>n</sub>/(InP)<sub>n</sub> short-period superlattice'. Together they form a unique fingerprint.

  • Cite this