title: The role of graphene formed on silver nanowire transparent conductive electrode in ultra-violet light emitting diodes.
abstract: This paper reports a highly reliable transparent conductive electrode (TCE) that integrates silver nanowires (AgNWs) and high-quality graphene as a protecting layer. Graphene with minimized defects and large graphene domains has been successfully obtained through a facile two-step growth approach. Ultraviolet light emitting diodes (UV-LEDs) were fabricated with AgNWs or hybrid electrodes where AgNWs were combined with two-step grown graphene (A-2GE) or conventional one-step grown graphene (A-1GE). The device performance and reliability of the UV-LEDs with three different electrodes were compared. The A-2GE offered high figure of merit owing to the excellent UV transmittance and reduced sheet resistance. As a consequence, the UV-LEDs made with A-2GE demonstrated reduced forward voltage, enhanced electroluminescence (EL) intensity, and alleviated efficiency droop. The effects of joule heating and UV light illumination on the electrode stability were also studied. The present findings prove superior performance of the A-2GE under high current injection and continuous operation of UV LED, compared to other electrodes. From our observation, the A-2GE would be a reliable TCE for high power UV-LEDs.
authors.affiliation: Applied Quantum Composites Research Center, Korea Institute of Science and Technology, Jeonbuk 565-905, South Korea.
authors.forename: Tae Hoon
authors.initials: TH
authors.lastname: Seo
authors.affiliation: Applied Quantum Composites Research Center, Korea Institute of Science and Technology, Jeonbuk 565-905, South Korea.
authors.forename: Seula
authors.initials: S
authors.lastname: Lee
authors.affiliation: Applied Quantum Composites Research Center, Korea Institute of Science and Technology, Jeonbuk 565-905, South Korea.|School of Semiconductor and Chemical Engineering, Semiconductor Physics Research Center, Chonbuk National University, Jeonju 561-756, South Korea.
authors.forename: Kyung Hyun
authors.initials: KH
authors.lastname: Min
authors.affiliation: School of Semiconductor and Chemical Engineering, Semiconductor Physics Research Center, Chonbuk National University, Jeonju 561-756, South Korea.
authors.forename: S
authors.initials: S
authors.lastname: Chandramohan
authors.affiliation: School of Semiconductor and Chemical Engineering, Semiconductor Physics Research Center, Chonbuk National University, Jeonju 561-756, South Korea.
authors.forename: Ah Hyun
authors.initials: AH
authors.lastname: Park
authors.affiliation: School of Semiconductor and Chemical Engineering, Semiconductor Physics Research Center, Chonbuk National University, Jeonju 561-756, South Korea.
authors.forename: Gun Hee
authors.initials: GH
authors.lastname: Lee
authors.affiliation: Photoelectronic Hybrid Research Center, Korea Institute of Science and Technology, Seoul 136-791, South Korea.
authors.forename: Min
authors.initials: M
authors.lastname: Park
authors.affiliation: School of Semiconductor and Chemical Engineering, Semiconductor Physics Research Center, Chonbuk National University, Jeonju 561-756, South Korea.
authors.forename: Eun-Kyung
authors.initials: EK
authors.lastname: Suh
authors.affiliation: Applied Quantum Composites Research Center, Korea Institute of Science and Technology, Jeonbuk 565-905, South Korea.
authors.forename: Myung Jong
authors.initials: MJ
authors.lastname: Kim