LY2606368 concentration Figure Erastin concentration 1 PL spectra at 15 K as a function of the CL growth temperature. Capping layer thickness In order to analyze the impact of the CL thickness on the PL properties, a series of samples with 2.5-, 5.0-, and 7.5-nm-thick GaAsSbN CLs was grown (labeled as B1, B2, and B3, respectively). Figure 2 shows the PL spectra at 15 K of the three samples, and the extracted FWHM and integrated intensity are represented in the inset. Reducing the CL thickness from 7.5 to 2.5 nm induces a considerable blueshift, leading also to a decrease

of 20 meV in the FWHM and to a significant enhancement in the integrated intensity by a factor of 15. Thus, a clear tendency of the luminescence properties with the CL thickness can be observed, whereby the peak wavelength is red-shifted as the CL thickness https://www.selleckchem.com/products/tpca-1.html increases, accompanied by a significant degradation of the radiative efficiency. This redshift could arise from several mechanisms. First, a thicker strain-reducing CL should induce a reduction of the compressive strain inside the QD.

Second, and as it happens in GaAsSb-capped QDs [26], the QD size may be larger for thicker GaAsSbN CLs. The degradation of the radiative efficiency likely originated from a higher composition modulation. Indeed, a higher composition modulation is expected for thicker CLs since they accumulate a larger amount of strain, yielding a more pronounced interface roughness. This clustering and roughness would directly impact the carrier injection efficiency into the InAs QDs, decreasing the radiative efficiency of the PL. Figure 2 PL spectra at 15 K for samples with different CL thicknesses. The inset shows the FWHM and the integrated intensity as a function of the CL thickness. Lines are guides to the eye. Capping layer growth rate The GaAsSbN CL A series of samples was grown wherein the Interleukin-3 receptor only modified parameter was the growth rate of the quaternary GaAsSbN CL while the rest of the growth parameters were kept at their reference values. Five samples with CL growth rates of 0.5, 1.0, 1.2, 1.5, and 2.0 ML s−1 were grown (labeled as C1, C2, C3, C4, and C5, respectively). Figure 3 shows the PL spectra

for this series of samples with their integrated intensity and FWHM evolution depicted in the inset. A significant enhancement of the PL properties with the growth rate is observed. The integrated intensity is improved up to 40 times when going from 0.5 to 2.0 ML s−1, and the FWHM is reduced to 38 meV for rates above 1.2 ML s−1. Moreover, samples with the CL grown at and above 1.2 ML s−1 showed RT luminescence (the RT PL results will be discussed below). However, the emission is blue-shifted when the growth rate is increased, which suggests a reduced N and/or Sb incorporation in the CL. Figure 3 PL spectra at 15 K for samples with different CL growth rates. The inset shows the FWHM and the integrated intensity as a function of the CL growth rate. Lines are guides to the eye.