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We have demonstrated that the thickness of the catalyst layer plays a significant role in the morphology and the material quality of the InN nanocolumns grown on Si(111) substrate by plasma-assisted molecular beam expitaxy using vapor-liquid-solid method. A systematic investigation of In catalyst films was undertaken, revealing that high density uniform InN can not be obtained when the In catalyst is either too thin or too thick and the appropriate thickness of the deposited In was 1 nm. The influence of V/III radio on the growth procedure is also discussed, and as proved, a higher V/III radio is necessary to be used to get high density nanocolumns and improved optical property. [ABSTRACT FROM AUTHOR]

Near infrared light-emitting diode (LED) based on p-NiO/n-InN/n-GaN was realized by plasma-assisted molecular beam epitaxy (PAMBE) combined with radio frequency (rf) magnetron sputtering. The device exhibited diode-like rectifying current–voltage characteristics with a turn-on voltage of 1.0 V. Under forward bias, prominent near infrared (NIR) emissions were observed at peak around 1570 nm at room temperature. The NIR emission was ascribed to the band-edge emission of InN epilayer based on the photoluminescence spectrum and band diagram of the heterojunction. Moreover, the study of the LED in terms of the stability was also discussed. [ABSTRACT FROM AUTHOR]

The n-InN/p-NiO/GaN heterojunction was fabricated by using plasma-assisted molecular beam epitaxy (PAMBE) combined with radio frequency magnetron sputtering. The device exhibited typical rectification characteristic with a turn-on voltage of ~1.5 V. Under forward bias, a dominant near infrared emission (NIR) peaked around 1565 nm was detected at room temperature. The NIR emission was attributed to the band-edge emission of InN film according to the photoluminescence spectrum of InN layer. Furthermore, the mechanism of the current transport and light emission was tentatively discussed in terms of the band diagrams of the heterojunction. [ABSTRACT FROM AUTHOR]

We fabricated the light-emitting diodes (LEDs) consisting of n-InN/p-NiO/p-Si heterostructure by using plasma-assisted molecular beam epitaxy (PAMBE) combined with radio frequency (RF) magnetron sputtering. The device exhibited diode-like rectifying current–voltage characteristics and had a turn-on voltage of 2.0 V. Under forward bias, a prominent narrow near infrared (NIR) emission peaked around 1565 nm was observed at room temperature. The NIR emission was demonstrated to come from the band-edge emission of InN layer. Moreover, the study of the LED in terms of the stability and efficiency were also discussed in detail. [ABSTRACT FROM AUTHOR]

InN epilayers were deposited on nitrided sapphire substrates using plasma-assisted molecular beam epitaxy (PAMBE) system. The physical properties of InN films under different growth temperatures were thoroughly studied. The XRD results indicated that as-prepared InN films without Indium droplets were preferentially oriented in the c-axis direction. The SEM results showed that the InN films grown in a two-dimensional mode with a thickness of ∼200 nm under the growth temperature of 460 °C. In addition, the optical absorption measurement exhibited that the energy bandgap of InN films was around 0.75–0.81eV and the PL spectra of the epilayers revealed an infrared emission. Moreover, the electrical properties of the films were discussed by Hall effect in detail. [ABSTRACT FROM AUTHOR]

InN epilayers were prepared on c -plane (0001) sapphire substrates by plasma-assisted molecular beam epitaxy (PAMBE). We studied the effect of nitridation on structure, surface morphology, electrical and optical properties of InN films using X-ray diffraction (XRD), Reflection high-energy electron diffraction (RHEED), scanning electron microscopy (SEM), atomic force microscopy (AFM), Hall and photoluminescence (PL) measurement. The results showed a significant improvement of the crystalline qualities and surface morphologies and enhancement of the electrical and optical properties for InN films grown after nitridation. Moreover, the energy band-gap of InN films were also determined by optical absorption and photoluminescence (PL) measurement. [ABSTRACT FROM AUTHOR]

An n-InN nanodots/p-Si(1 1 1) heterojunction diode was fabricated by plasma-assisted molecular beam epitaxy. The device shows clear rectifying behaviour with a turn-on voltage of approximately 1.2 V at room temperature. The near-infrared electroluminescence (EL) can be observed under forward bias, which covers a wide wavelength range. In comparison with the photoluminescence spectra, the maximum of the EL spectra has a blueshift which is probably due to the size quantization effect of small-sized InN nanodots and their stronger contribution to the EL intensity. On the other hand, there is an obvious enhancement of the less dominant transitions on the short wavelength side of the EL spectra, which may arise from the recombination of the injected holes with the extremely high-density surface electrons of InN nanodots. [ABSTRACT FROM AUTHOR]