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.
Solution-processed, bulk-heterojunction Organic Photovoltaic (OPV) devices with a high Voc (up to 1.35 V) were fabricated with a high band gap electron-donor copolymer blended with a small-molecule electron-acceptor. The copolymer (PInCZ), based on carbazole and indolocarbazole monomers, posseses a deep lying HOMO (Highest Occupied Molecular Orbital) of −5.6 eV. Coupling this polymer with the small-molecule...
InGaP(1.88eV)/GaAs(1.43eV)/InGaAs(0.98eV) triple junction solar cells with high efficiencies of 37.9% (AM1.5G) and 44.4% (AM1.5D, 302-suns) have been attained by inverted lattice-mismatch fabrication procedure. Cell structure was optimized to improve radiation resistance for space use. Lightweight space solar sheet has been developed by using the film type triple junction cells. Good performance of...
We describe the design, fabrication and results of passivated contacts to n-type silicon utilizing thin SiO2 and indium tin oxide. High-temperature silicon dioxide is grown on both surfaces on an n-type Si wafer to a thickness <50 Å, followed by deposition of tin-doped indium oxide (ITO) and a patterned metal contacting layer. As deposited, the thin-film stack has a very high recombination parameter,...
Conference proceedings front matter may contain various advertisements, welcome messages, committee or program information, and other miscellaneous conference information. This may in some cases also include the cover art, table of contents, copyright statements, title-page or half title-pages, blank pages, venue maps or other general information relating to the conference that was part of the original...
The next generation of multi-junction concentrator solar cells will have to reach higher efficiencies than today's devices. At the same time these solar cells must be reliable in the field, be manufacturable with good yield and at sufficiently low cost. Inevitably the request of higher efficiency requires four or even more junction devices. A four-junction solar cell combination of GaInP/GaAs//GaInAsP/GaInAs...
Spectrolab has fabricated a direct semiconductor bonded space solar cell with an efficiency of 35.8% under the AM0 space spectrum. Using a similar technology, Spectrolab has achieved a 5-junction (5J) direct bonded terrestrial cell with a record efficiency of 38.8% under the one-sun AM1.5G terrestrial spectrum. Efforts to further improve the 5J cell efficiency have focused on development of the top...
Four-junction inverted metamorphic solar cells for terrestrial concentrator applications have been grown, fabricated, and tested by EMCORE. Internal test results show measured efficiency in the range of 44.9–47.6% at ∼210 Suns, which could be a new world record. Third party verification of these results is currently underway. This paper will focus on the development and characterization of this device...
Efficient capture of sunlight remains one of the great challenges to photovoltaics today. This is particularly so for the dominant photovoltaic material - crystalline silicon - which, as an indirect gap semiconductor, needs several hundred micrometers thickness for efficient operation. This paper gives an overview of the principal concepts that are currently being considered to enhance light capture...
The silicate phosphor on the surface of GaAs solar cell are demonstrated to have promising potential for efficient solar spectrum utilization. The phosphor is a common utilized material in white light LED package, so the cost of phosphor is relatively low and the stability is good. The solar cells showed an enhancement of 22.8% in short-circuit current density and approximately 25.3% in power conversion...
Luminescent materials suitably embedded into the architecture of photovoltaic (PV) modules can increase the short-wavelength response, and thus efficiency, of nearly all inproduction PV technologies. At the same time, visible-wavelength luminescence that escapes the modules due to its omnidirectional nature is perceived as color when it reaches the human eye. It is shown that this “lost” luminescence...
Efficiency of 12.3% on solution-based Cu2ZnSn(SeS)4 (CZTSeS) solar cells was achieved by applying hybrid buffer layer with combination of In-based buffer and Cd-based buffer layers. Previously, the Voc boost by the hybrid buffer layer on Cu2ZnSnS4 (CZTS) and CZTSeS solar cells have been reported[1–2]. In this paper, the latest results and some analyses of the hybrid buffer for solution-based CZTSeS...
As the interest in Cu2ZnSn(SxSe1−x)4 (0 ≤ x ≤ 1) kesterite based thin film solar cells increases, the development of new processes and characterization methodologies are required to satisfy its own peculiarities. In order to achieve better device performance and higher efficiencies a detailed systematic study of the fundamental properties of these materials is required. In this study, Raman spectroscopy...
Fast diffusing metals in silicon can form large precipitates. Although such precipitates can be damaging because of junction leakage they are not powerful recombination centers. In contrast we have investigated the precipitation of slow diffusing metals and found that they can produce nano-precipitates with dimensions of 2 to 10 nm. These have strong recombination activity. In this paper we focus...
The efficiency of multicrystalline silicon solar cells suffers from the presence of extended defects like dislocations and grain boundaries. In fact, the defects themselves do not implicitly have to be harmful, but their interaction with impurities makes them detrimental for the cell efficiencies.
Low-cost Silicon feedstock with multiple native dopants (mostly Boron and Phosphorous but also Gallium and trace amounts of Aluminum) is establishing itself as a cost effective complement to incumbent ultra high purity Silicon. In such co-doped materials, interstitial iron has recently been shown to redistribute from one acceptor type to the other. In this paper, the redistribution of this important...
In this work we measure the exciton diffusion length (LD) of the electron donor material boron subphthalocyanine chloride (SubPc) as a function of concentration in a wide energy gap host material, effectively modulating the intermolecular separation. It is shown that the LD of neat SubPc (LD = 10.7 nm) can be increased by ∼50% at a concentration of 25 wt.% (LD = 15.4 nm). The enhancement in LD is...
Numerical simulations based on kinetic Monte Carlo (kMC) techniques provide a powerful and versatile tool to gain a deep understanding of nanoscale processes in bulk organic heterojunction (BHJ) solar cells and to guide their optimization. Low-bandgap polymer donor materials count as constituents for novel cells with improved efficiency, mainly because they extend the absorption to the infrared region...
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.