Characteristics of GaN-based LED fabricated on a GaN-on-silicon platform

Zheng Shi, Xin Li, Gangyi Zhu, Zhenhai Wang, Peter Grünberg, Hongbo Zhu, Yongjin Wang

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

In this paper, we describe the fabrication and characterization of a GaN-based light-emitting diode (LED) on a GaN-on-silicon platform. A freestanding membrane structure eliminates the absorption of the emitted light by a silicon substrate and reduces the number of confined optical modes, leading to higher photoluminescence intensity. Compared with an LED with a silicon substrate, the current-voltage characteristics of a freestanding membrane LED demonstrate a lower turn-on voltage and a steeper current-voltage profile. Both anomalous positive capacitance peak and negative capacitance are observed in the capacitance-voltage measurements, which correspond well to the current-voltage characteristics. The measured electroluminescence intensity is significantly increased for a freestanding membrane LED. These experimental results show that our proposed substrate removal technology is promising for the fabrication of a high-performance membrane LED for diverse applications.

Original languageEnglish
Article number082102
JournalApplied Physics Express
Volume7
Issue number8
DOIs
Publication statusPublished - Aug 2014
Externally publishedYes

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