The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The self-assembled InAs quantum dots (QDs) on Si substrate with high density (7.5×1010 cm-2) were achieved using relatively lower growth temperature by low-pressure metal-organic chemical vapor deposition. The PL spectra exhibit 1.3μm emission from InAs quantum dots at room temperature. PL measurements at 77K, Full Width at Half-Maximum (FWHM) is about 60meV.
Quantum dot (QD) solar cells have been proposed as a means to exceed the Shockley and Queisser efficiency limit of 31%, via the absorption of sub-band-gap photons, conventionally lost in a single junction solar cell (SC). Previous reports on fabricated InAs/GaAs QDSCs showed a slight increase in photoresponse, due to below-band gap absorption. However, they all showed a severe degradation of open...
Regardless of the excellent feature of three-dimensional (3D) photonic crystals (PhCs) to manipulate lights in all direction irrespective of their polarization directions, two-dimensional (2D) PhCs have been preferred by researchers in this field than 3D PhCs, because 2D PhCs provide us manipulatability of light, which is nearly comparable to those of 3D PhCs, without apparent difficulty in fabrication...
Room-temperature continuous wave lasing in quantum dots covered with GalnNAs on GaAs substrate was attained at 1.31 μm with threshold current density of 0.4 kA/cm2 by metal-organic chemical vapor deposition. The range of continuous wave lasing was extended to 1.33 μm with using a thin p-clad layer.
Summary form only given. The spectroscopy of individual quantum dots (QDs) using optical micro-probing techniques is opening up possibilities of various applications based on the physics of the zero-dimensional (0D) semiconductor structures. Self-assembled quantum dots (SAQDs) are also attractive 0D structures, where strong confinement on a no-meter scale can be realized. Here, we carried out time-correlation...
Summary from only given. In recent years, many studies of the electronic states in self-assembled quantum dots (SAQDs) using single dot spectroscopy have been reported. PL spectra measured by single dot spectroscopy show discrete and sharp peaks which indicate 0D confinement of carriers. At higher excitation powers, PL spectra show the interesting phenomena where we see many peaks to be emerged. Delkel...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.