InGaN/GaN Core–Shell Single Nanowire Light Emitting Diodes with Graphene-Based P-Contact

Abstract

We report on the demonstration of MOVPE-grown single nanowire InGaN/GaN core-shell light emitting diodes (LEDs) with a transparent graphene contact for hole injection. The electrical homogeneity of the graphene-contacted LED has been assessed by electron beam induced current microscopy. By comparing graphene-contacted and metal-contacted nanowire LEDs, we show that the contact layout determines the electroluminescence spectrum. The electroluminescence changes color from green to blue with increasing injection current. High-resolution cathodoluminescence on cleaved nanowires allows the location with high precision of the origin of different emitted wavelengths and demonstrates that the blue peak originates from the emission of the radial quantum well on the m-planes, whereas the green peak arises from the In-rich region at the junction between the m-planes and the semipolar planes. The spectral behavior of the electroluminescence is understood by modeling the current distribution within the nanowire.

Strong Amplified Spontaneous Emission from High Quality GaAs1–xSbx Single Quantum Well Nanowires

“…35,49,50 Here we use CL to examine the luminescence uniformity of these QW nanowires since CL has higher spatial resolution than PL. The room temperature CL results for GaAs1-xSbx QW grown at 725 °C are shown in Similar to the observed non-uniform luminescence intensity distribution in nanowires, 35,49,50 CL emission intensity of the GaAs1-xSbx QW nanowire is weaker at both ends of the nanowire (Figure 3a-e), especially at the nanowire top. This implies lower quality of the GaAs1-xSbx QW at bottom and top of nanowire, which is probably caused by local growth condition differences.…”

Comprehensive Theoretical and Experimental Studies on Iii-Nitrides, Doping, Nano-Structures and Leds

“…Recently, the nanowire LED, [58][59][60][61][62] mainly core/shell LED, has attracted large attention because of their potential advantages. In comparison to the conventional thin film LEDs, core/shell nanorod structure LEDs have higher aspect ratio and larger active regions.…”

Cation exchange assisted low temperature chemical synthesis of ZnO@Ag2S core–shell nanoparticles and their photo-catalytic properties

“…To investigate this point, the EBT dye without adding any photocatalyst agent was kept in the photoreactor for 2 h. The experiment was repeated at two different pH values (4,10) and according to the plot of C/C 0 versus time shown in Fig. 10b, the EBT dye has not be decolorized by irradiation of UV light in absence of the degradation agent.…”

“…Semiconductors nanoparticles (NPs), and because of their outstanding optical properties are considered as promising materials [1] for different applications such as solar cells [2], photodetectors [3], and light-emitting diodes [4]. Zinc oxide (ZnO) NPs as a cheap semiconductor with a wide direct band gap (3.37 eV) at room temperature [5] showed a potential for the use as photocatalyst [6], photodetectors [7], gas sensors [8], piezoelectric sensors [9] and ultraviolet laser [10].…”