中国物理B ›› 2017, Vol. 26 ›› Issue (10): 104402-104402.doi: 10.1088/1674-1056/26/10/104402
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
Ming-Can Qian(钱明灿), Shu-Fang Zhang(张淑芳), Hai-Jun Luo(罗海军), Xing-Ming Long(龙兴明), Fang Wu(吴芳), Liang Fang(方亮), Da-Peng Wei(魏大鹏), Fan-Ming Meng(孟凡明), Bao-Shan Hu(胡宝山)
Ming-Can Qian(钱明灿)1, Shu-Fang Zhang(张淑芳)2, Hai-Jun Luo(罗海军)1,3, Xing-Ming Long(龙兴明)3, Fang Wu(吴芳)1, Liang Fang(方亮)1, Da-Peng Wei(魏大鹏)4, Fan-Ming Meng(孟凡明)1, Bao-Shan Hu(胡宝山)5
摘要: In order to decrease the Schottky barrier height and sheet resistance between graphene (Gr) and the p-GaN layers in GaN-based light-emitting diodes (LEDs), some transparent thin films with good conductivity and large work function are essential to insert into Gr and p-GaN layers. In this work, the ultra-thin films of four metals (silver (Ag), golden (Au), nickel (Ni), platinum (Pt)) are explored to introduce as a bridge layer into Gr and p-GaN, respectively. The effect of a different combination of Gr/metal transparent conductive layers (TCLs) on the electrical, optical, and thermal characteristics of LED was investigated by the finite element methods. It is found that both the TCLs transmittance and the surface temperature of the LED chip reduces with the increase of the metal thickness, and the transmittance decreases to about 80% with the metal thickness increasing to 2 nm. The surface temperature distribution, operation voltage, and optical output power of the LED chips with different metal/Gr combination were calculated and analyzed. Based on the electrical, optical, and thermal performance of LEDs, it is found that 1.5-nm Ag or Ni or Pt, but 1-nm Au combined with 3 layered (L) Gr is the optimal Gr/metal hybrid transparent and current spreading electrode for ultra-violet (UV) or near-UV LEDs.
中图分类号: (Analytical and numerical techniques)