The Experts below are selected from a list of 4485 Experts worldwide ranked by ideXlab platform
Nazir P. Kherani - One of the best experts on this subject based on the ideXlab platform.
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see through dye sensitized solar cells photonic reflectors for tandem and building Integrated Photovoltaics
Advanced Materials, 2013Co-Authors: Leophilipp Heiniger, Geoffrey A Ozin, Nazir P. Kherani, Michael Gratzel, Paul Obrien, Navid Soheilnia, Yang Yang, Nicolas TetreaultAbstract:See-through dye-sensitized solar cells with 1D photonic crystal Bragg reflector photoanodes show an increase in peak external quantum efficiency of 47% while still maintaining high fill factors, resulting in an almost 40% increase in power conversion efficiency. These photoanodes are ideally suited for tandem and building Integrated Photovoltaics.
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Selectively transparent and conducting photonic crystal rear-contacts for thin-film silicon-based building Integrated Photovoltaics
Optics Express, 2011Co-Authors: P. G. O’Brien, Pratish Mahtani, Keith Leong, Geoffrey A Ozin, Alongkarn Chutinan, Nazir P. KheraniAbstract:Wave-optics analysis is performed to show that selectively transparent and conducting photonic crystals (STCPCs) can be utilized as rear contacts to enhance the performance of building-Integrated Photovoltaics (BIPV). For instance, the current generated in an a-Si:H cell with an STCPC functioning as its rear contact is comparable to that of a similar cell with an optimized ZnO/Ag rear contact. However, the solar lumens (~3.5 klm/m2) and power (~430W/m2) transmitted through the cell with the STCPC rear contact can potentially provide indoor heating and lighting, respectively. Moreover, experimental results show that STCPC rear contacts could be used to control the color temperature of light transmitted through BIPV panels.
Sergio Brovelli - One of the best experts on this subject based on the ideXlab platform.
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Luminescent solar concentrators for building-Integrated Photovoltaics
Nature Reviews Materials, 2017Co-Authors: Francesco Meinardi, Francesco Bruni, Sergio BrovelliAbstract:Luminescent solar concentrators (LSCs) offer a unique opportunity to ‘invisibly’ integrate semi-transparent photovoltaic architectural elements, such as electrodeless glazing units, into the building envelope. This Review highlights the advancements making LSCs a realistic technology for near zero-energy buildings, along with the remaining challenges and strategies for further device optimization. The transition to fully energetically sustainable architecture through the realization of so-called net zero-energy buildings is currently in progress in areas with low population density. However, this is not yet true in cities, where the cost of land for the installation of ground photovoltaic (PV) is prohibitively high and the rooftop space is too scarce to accommodate the PV modules necessary for sustaining the electrical requirements of tall buildings. Thus, new technologies are being investigated to integrate solar-harvesting devices into building façades in the form of PV windows or envelope elements. Luminescent solar concentrators (LSCs) are the most promising technology for semi-transparent, electrodeless PV glazing systems that can be Integrated ‘invisibly’ into the built environment without detrimental effects to the aesthetics of the building or the quality of life of the inhabitants. After 40 years of research, recent breakthroughs in the realization of reabsorption-free emitters with broadband absorption have boosted the performance of LSCs to such a degree that they might be commercialized in the near future. In this Perspective, we explore the successful strategies that have allowed this change of pace, examining and comparing the different types of chromophores and waveguide materials, and discuss the issues that remain to be investigated for further progress.
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Highly efficient luminescent solar concentrators based on earth-abundant indirect-bandgap silicon quantum dots
Nature Photonics, 2017Co-Authors: Francesco Meinardi, Francesco Carulli, Roberto Simonutti, Francesco Bruni, Samantha Ehrenberg, Lorena Dhamo, Michele Mauri, Uwe Kortshagen, Sergio BrovelliAbstract:Building-Integrated Photovoltaics is gaining consensus as a renewable energy technology for producing electricity at the point of use. Luminescent solar concentrators (LSCs) could extend architectural integration to the urban environment by realizing electrode-less photovoltaic windows. Crucial for large-area LSCs is the suppression of reabsorption losses, which requires emitters with negligible overlap between their absorption and emission spectra. Here, we demonstrate the use of indirect-bandgap semiconductor nanostructures such as highly emissive silicon quantum dots. Silicon is non-toxic, low-cost and ultra-earth-abundant, which avoids the limitations to the industrial scaling of quantum dots composed of low-abundance elements. Suppressed reabsorption and scattering losses lead to nearly ideal LSCs with an optical efficiency of η = 2.85%, matching state-of-the-art semi-transparent LSCs. Monte Carlo simulations indicate that optimized silicon quantum dot LSCs have a clear path to η > 5% for 1 m^2 devices. We are finally able to realize flexible LSCs with performances comparable to those of flat concentrators, which opens the way to a new design freedom for building-Integrated Photovoltaics elements. Reabsorption losses in luminescent solar concentrators can be avoided by the use of indirect-bandgap semiconductor nanostructures. The technology has been used to demonstrate flexible luminescent solar concentrators with performance comparable to flat concentrators.
Geoffrey A Ozin - One of the best experts on this subject based on the ideXlab platform.
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see through dye sensitized solar cells photonic reflectors for tandem and building Integrated Photovoltaics
Advanced Materials, 2013Co-Authors: Leophilipp Heiniger, Geoffrey A Ozin, Nazir P. Kherani, Michael Gratzel, Paul Obrien, Navid Soheilnia, Yang Yang, Nicolas TetreaultAbstract:See-through dye-sensitized solar cells with 1D photonic crystal Bragg reflector photoanodes show an increase in peak external quantum efficiency of 47% while still maintaining high fill factors, resulting in an almost 40% increase in power conversion efficiency. These photoanodes are ideally suited for tandem and building Integrated Photovoltaics.
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Selectively transparent and conducting photonic crystal rear-contacts for thin-film silicon-based building Integrated Photovoltaics
Optics Express, 2011Co-Authors: P. G. O’Brien, Pratish Mahtani, Keith Leong, Geoffrey A Ozin, Alongkarn Chutinan, Nazir P. KheraniAbstract:Wave-optics analysis is performed to show that selectively transparent and conducting photonic crystals (STCPCs) can be utilized as rear contacts to enhance the performance of building-Integrated Photovoltaics (BIPV). For instance, the current generated in an a-Si:H cell with an STCPC functioning as its rear contact is comparable to that of a similar cell with an optimized ZnO/Ag rear contact. However, the solar lumens (~3.5 klm/m2) and power (~430W/m2) transmitted through the cell with the STCPC rear contact can potentially provide indoor heating and lighting, respectively. Moreover, experimental results show that STCPC rear contacts could be used to control the color temperature of light transmitted through BIPV panels.
Kuang Sheng - One of the best experts on this subject based on the ideXlab platform.
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mgzno high voltage thin film transistors on glass for inverters in building Integrated Photovoltaics
Scientific Reports, 2016Co-Authors: Wenchiang Hong, Siamak Abbaslou, Pavel Ivanoff Reyes, Szuying Wang, Kuang ShengAbstract:Building Integrated Photovoltaics (BIPV) have attracted considerable interests because of its aesthetically attractive appearance and overall low cost. In BIPV, system integration on a glass substrate like windows is essential to cover a large area of a building with low cost. However, the conventional high voltage devices in inverters have to be built on the specially selected single crystal substrates, limiting its application for large area electronic systems, such as the BIPV. We demonstrate a Magnesium Zinc Oxide (MZO) based high voltage thin film transistor (HVTFT) built on a transparent glass substrate. The devices are designed with unique ring-type structures and use modulated Mg doping in the channel - gate dielectric interface, resulting in a blocking voltage of over 600 V. In addition to BIPV, the MZO HVTFT based inverter technology also creates new opportunities for emerging self-powered smart glass.
Nicolas Tetreault - One of the best experts on this subject based on the ideXlab platform.
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see through dye sensitized solar cells photonic reflectors for tandem and building Integrated Photovoltaics
Advanced Materials, 2013Co-Authors: Leophilipp Heiniger, Geoffrey A Ozin, Nazir P. Kherani, Michael Gratzel, Paul Obrien, Navid Soheilnia, Yang Yang, Nicolas TetreaultAbstract:See-through dye-sensitized solar cells with 1D photonic crystal Bragg reflector photoanodes show an increase in peak external quantum efficiency of 47% while still maintaining high fill factors, resulting in an almost 40% increase in power conversion efficiency. These photoanodes are ideally suited for tandem and building Integrated Photovoltaics.