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.
Tandem solar cells made from III-V layers grown on silicon have the potential for high efficiencies at relatively low cost. Recent work has produced a GaAsP/SiGe tandem with over 20% efficiency based on indoor measurements. In this work, improvements are made to this device and outdoor performance is reported for the first time. Light trapping and substrate thinning techniques developed on a SiGe...
Lattice matched and current matched GaAsP/SiGe tandem solar cell on Si has the potential of 40% efficiency. This paper describes our design, fabrication and improvement of this tandem solar cell. This tandem device has achieved efficiencies of 20.6% and 20.2% under 1X and 2.2X, respectively. Current matching between top cell and bottom cell is realized by manipulating the bottom cell active area and...
A graded buffer layer is needed in order to grow III–V/SiGe on silicon substrate because of the lattice mismatch. In this work, optical absorption in the graded buffer layer is quantified by measuring the transmittances. We demonstrate a 7 µm graded buffer layer with Ge composition from 0% to 82% is equivalent to a 2 µm SiGe film with 82% Ge composition in terms of optical absorption. A SiGe solar...
Light trapping capability is analyzed for the SiGe solar cell in the GaAsP-SiGe tandem device. One-dimensional model predicts an achievable Jsc of 17.46 mA/cm2 below the top cell, with the electrical parameter from quantum efficiency fitting. Experimentally, a Jsc of 15.59 mA/cm2 was achieved from the Si.18Ge.82 cell, with textured SiO2 back surface reflector and a single layer SiNx anti-reflection...
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.