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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 6 — Mar. 14, 2011
  • pp: 5442–5450

Opposite carrier dynamics and optical absorption characteristics under external electric field in nonpolar vs. polar InGaN/GaN based quantum heterostructures

Emre Sari, Sedat Nizamoglu, Jung-Hun Choi, Seung-Jae Lee, Kwang-Hyeon Baik, In-Hwan Lee, Jong-Hyeob Baek, Sung-Min Hwang, and Hilmi Volkan Demir  »View Author Affiliations

Optics Express, Vol. 19, Issue 6, pp. 5442-5450 (2011)

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We report on the electric field dependent carrier dynamics and optical absorption in nonpolar a-plane GaN-based quantum heterostructures grown on r-plane sapphire, which are surprisingly observed to be opposite to those polar ones of the same materials system and similar structure grown on c-plane. Confirmed by their time-resolved photoluminescence measurements and numerical analyses, we show that carrier lifetimes increase with increasing external electric field in nonpolar InGaN/GaN heterostructure epitaxy, whereas exactly the opposite occurs for the polar epitaxy. Moreover, we observe blue-shifting absorption spectra with increasing external electric field as a result of reversed quantum confined Stark effect in these polar structures, while we observe red-shifting absorption spectra with increasing external electric field because of standard quantum confined Stark effect in the nonpolar structures. We explain these opposite behaviors of external electric field dependence with the changing overlap of electron and hole wavefunctions in the context of Fermi’s golden rule.

© 2011 OSA

OCIS Codes
(160.4760) Materials : Optical properties
(160.6000) Materials : Semiconductor materials
(230.0250) Optical devices : Optoelectronics

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: December 22, 2010
Revised Manuscript: February 23, 2011
Manuscript Accepted: February 25, 2011
Published: March 8, 2011

Emre Sari, Sedat Nizamoglu, Jung-Hun Choi, Seung-Jae Lee, Kwang-Hyeon Baik, In-Hwan Lee, Jong-Hyeob Baek, Sung-Min Hwang, and Hilmi Volkan Demir, "Opposite carrier dynamics and optical absorption characteristics under external electric field in nonpolar vs. polar InGaN/GaN based quantum heterostructures," Opt. Express 19, 5442-5450 (2011)

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