Transparent graphene interconnects for monolithic integration of GaN-based LEDs

Multilayer graphene as a transparent interconnect electrode for the monolithic integration of GaN-based LEDs was investigated. On the basis of morphology determined by scanning electron microscopy and optoelectrical properties, it was found that graphene acts as an effective interconnect in GaN-based LED arrays. Graphene interconnect electrodes formed an air bridge between adjacent microchips, leading to the reduction in reverse leakage current. Compared with conventional LEDs with metal interconnects, the light output power of LEDs with graphene interconnects exhibited an improvement of 7.4%. This enhancement originated from the significantly reduced absorption of the light emitted from graphene electrodes, which was confirmed by spatial beam profile measurements.

[1]  Wei Liu,et al.  Graphene-based transparent conductive electrodes for GaN-based light emitting diodes: Challenges and countermeasures , 2015 .

[2]  Yi-Jen Chan,et al.  The development of monolithic alternating current light-emitting diode , 2011, OPTO.

[3]  Jong Kyu Kim,et al.  Solid-State Light Sources Getting Smart , 2005, Science.

[4]  H. Kuo,et al.  Characteristics of Single-Chip GaN-Based Alternating Current Light-Emitting Diode , 2008 .

[5]  Azad Naeemi,et al.  Evaluation of the Potential Performance of Graphene Nanoribbons as On-Chip Interconnects , 2013, Proceedings of the IEEE.

[6]  Hongwei Zhu,et al.  Annealed InGaN green light-emitting diodes with graphene transparent conductive electrodes , 2012 .

[7]  Jung Min Lee,et al.  Metal/graphene sheets as p-type transparent conducting electrodes in GaN light emitting diodes , 2011 .

[8]  Zhiqiang Liu,et al.  Characteristics of GaN-Based High-Voltage LEDs Compared to Traditional High Power LEDs , 2013, IEEE Photonics Technology Letters.

[9]  Guanxiong Liu,et al.  Ultraviolet Raman microscopy of single and multilayer graphene , 2009, 0903.1922.

[10]  S. Sakai,et al.  Monolithic Blue LED Series Arrays for High‐Voltage AC Operation , 2002 .

[11]  James S. Speck,et al.  Prospects for LED lighting , 2009 .

[12]  Andre K. Geim,et al.  Electric Field Effect in Atomically Thin Carbon Films , 2004, Science.

[13]  K. Novoselov,et al.  A roadmap for graphene , 2012, Nature.

[14]  Bong Hoon Kim,et al.  Stretchable, transparent graphene interconnects for arrays of microscale inorganic light emitting diodes on rubber substrates. , 2011, Nano letters.

[15]  E. Suh,et al.  Efficiency enhancement of nanorod green light emitting diodes employing silver nanowire-decorated graphene electrode as current spreading layer , 2014 .

[16]  S. Nakamura,et al.  Candela‐class high‐brightness InGaN/AlGaN double‐heterostructure blue‐light‐emitting diodes , 1994 .

[17]  J. Robertson,et al.  Synthesis of carbon nanotubes and graphene for VLSI interconnects , 2013 .

[18]  K. Banerjee,et al.  Proposal for all-graphene monolithic logic circuits , 2013 .

[19]  Yongjo Park,et al.  Efficient Alternating Current Operated White Light-Emitting Diode Chip , 2009, IEEE Photonics Technology Letters.

[20]  J. Kysar,et al.  Measurement of the Elastic Properties and Intrinsic Strength of Monolayer Graphene , 2008, Science.

[21]  H. Kuo,et al.  GaN alternating current light‐emitting device , 2007 .

[22]  Yi Jia,et al.  Graphene‐On‐Silicon Schottky Junction Solar Cells , 2010, Advanced materials.