InGaN/GaN ultraviolet LED with a graphene/AZO transparent current spreading layer

Li Lin, Yiyu Ou, Xiaolong Zhu, Eugen Stamate, Kaiyu Wu, Meng Liang, Zhiqiang Liu, Xiaoyan Yi, Berit Herstrøm, Anja Boisen, Flemming Jensen, Haiyan Ou*

*Corresponding author for this work

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We report an approach of using an interlayer of single layer graphene (SLG) for electroluminescence (EL) enhancement of an InGaN/GaN-based near-ultraviolet (NUV) light-emitting diode (LED) with an aluminum-doped zinc oxide (AZO)-based current spreading layer (CSL). AZO-based CSLs with and without a SLG interlayer were fabricated on the NUV LED epi-wafers. The current-voltage (I-V) characteristic and the EL intensity were measured and compared. We find that the LED without the SLG interlayer can possess a 40% larger series resistance. Furthermore, a 95% EL enhancement was achieved by the employment of the SLG interlayer.
Original languageEnglish
JournalOptical Materials Express
Issue number7
Pages (from-to)1818-1826
Publication statusPublished - 2018


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