A5054110521- Advanced Thermoelectric Materials and Devices
- Nanowire Synthesis and Applications
- Thermal properties of materials
- Thermal Radiation and Cooling Technologies
- Semiconductor materials and devices
- Silicon Nanostructures and Photoluminescence
- Semiconductor materials and interfaces
- Advanced Thermodynamics and Statistical Mechanics
- Silicon and Solar Cell Technologies
- Molecular Junctions and Nanostructures
- Gas Sensing Nanomaterials and Sensors
- solar cell performance optimization
- Chalcogenide Semiconductor Thin Films
- Glass properties and applications
- Thin-Film Transistor Technologies
- Luminescence Properties of Advanced Materials
- Advancements in Semiconductor Devices and Circuit Design
- Analytical Chemistry and Sensors
- Perovskite Materials and Applications
- Surface and Thin Film Phenomena
- Diamond and Carbon-based Materials Research
- Ion-surface interactions and analysis
- Photovoltaic System Optimization Techniques
- Phase-change materials and chalcogenides
- Conducting polymers and applications
University of Milano-Bicocca
2015-2024
University of Milan
1989-2023
Mylan (Switzerland)
2015-2019
Stanford University
2016
National Interuniversity Consortium for the Physical Sciences of Matter
2006-2014
Delta Air Lines (United States)
2012
Istituto Nazionale per la Fisica della Materia
1997-2003
IBM Research - Thomas J. Watson Research Center
1989-1991
IBM (United States)
1989
Institute of Structure of Matter
1988
Thick film polycristalline ZnO gas sensors for hydrogen partial pressure determination in hydrogen-air mixtures present at very complex kinetic behavior that demands to be thoroughly clarified order them used practical applications. For this reason a systematic investigation has been carried out on the time and temperature dependence of electrical conductivity films deposited via spray pyrolysis ceramic substrates range 498-573 K presence dispersed Pt as catalyst
A large thermoelectric power factor in heavily boron-doped p-type nanograined Si with grain sizes ∼30 nm and boundary regions of ∼2 is reported. The reported ∼5 times higher than bulk Si. It originates from the surprising observation that for a specific range carrier concentrations, electrical conductivity Seebeck coefficient increase simultaneously. two essential ingredients this are nanocrystallinity extremely high boron doping levels. This experimental finding interpreted within...
This paper will show that, while ZT is an appropriate performance index when optimizing the heat conversion rate, it may mislead research in view of applications aiming at large electric power production. special relevance related to surge area low-dimensionality semiconductors where increased by lowering thermal conductivity κ. It be shown operating between sources fixed temperature, highest output can obtained increasing κ, not decreasing it, larger economically enabling thermoelectric...
Thermoelectric generators, which convert heat directly into electrical power, have great potentialities in the energy harvesting field. The exploitation of these is limited by materials currently used, characterized good thermoelectric properties, but also several drawbacks. This work presents a silicon-based generator, made large collection heavily p-doped silicon nanostructures. macroscopic device (area mm2) collects together features silicon, terms high power factor, and very reduced...
In this letter, we report results of a hydrosilylation carried out on bifunctional molecules by using two different approaches, namely through thermal treatment and photochemical UV irradiation. Previously, our group also demonstrated that in mixed alkyne/alcohol solution, surface coupling is biased towards the formation Si–O–C linkages instead Si–C linkages, thus indirectly supporting kinetic model hydrogen abstraction from Si–H (Khung, Y. L. et al. Chem. – Eur. J. 2014, 20, 15151–15158)....
Abstract This paper reports the electrical characterization of commercially available crystalline silicon solar cells encapsulated with poly‐vinylacetate doped different Eu 3+ organic complexes. The inclusion these complexes in encapsulating matrix allows down‐shifting spectrum components below 420 nm toward maximum quantum efficiency cells. effect has been proven under Air Mass 1·5 conditions (simulating terrestrial applications) where an increase total power delivered by observed....
The spectacular growth of networks intercommunicating sensing nodes has generated a request for alternate, renewable power sources. Thermoelectric generators (TEGs), either conventional or integrated, are possible candidates. This paper analyzes the usability TEGs as alternate sources wireless sensor network. It is shown how meet requirements low-power and they outperform batteries installation costs. Factors still hampering TEG wider use also reviewed commented upon, an outlook at specific...
The electrical properties of dislocations and grain boundaries (GB) in directionally solidified polycrystalline silicon were extensively studied as a function the carbon, oxygen, nitrogen content, well relative orientation. As first result this study we obtained experimental evidence that oxygen carbon content are not independent variables material. Therefore, density activity shown to be strongly dependent on amount oxygen‐carbon compensation. second result, was also achieved which...
Energy filtering due to second-phase precipitation in nanocrystalline silicon may lead remarkable improvements of its thermoelectric power factor.
Abstract In a stringent and near oxygen‐free environment, SiH surfaces were introduced to trifluoroalkyne, an alcohol‐derivatized alkyne, as well equal mixture of both alkynes at temperature 130 °C. Contact angle measurements, high‐resolution X‐ray photoelectron spectroscopy (XPS), angle‐resolved XPS performed examine the system. found have strong preference towards formation SiOC rather than SiC bonds when alcohol alkyne reactivities compared.
Micro and nanotechnologies are called to play a key role in the fabrication of small low cost sensors with excellent performance enabling new continuous monitoring scenarios distributed intelligence paradigms (Internet Things, Trillion Sensors). Harvesting devices providing energy autonomy those large numbers microsensors will be essential. In where waste heat sources present, thermoelectricity obvious choice. However, miniaturization state art thermoelectric modules is not easy current...
This paper discusses enhancements of solar energy conversion by photovoltaic (PV) cells using thermoelectric (TE) generators harvesting the heat released PV cell. To optimize TE-PV coupling, efficiency losses are analyzed decoupling source- and absorber-dependent losses. shows that implementation a tandem PV-TE device leads to substantial increase available power densities depending on material. We further show major can be achieved adding an intermediate layer between TE stage capable...
Using two different hydrosilylation methods, low temperature thermal and UV initiation, silicon (111) hydrogenated surfaces were functionalized in presence of an OH-terminated alkyne, a CF3-terminated alkyne mixed equimolar ratio the alkynes. XPS studies revealed that absence premeditated surface radical through hydrosilylation, grafting proceeded to form Si-O-C linkage via nucleophilic reaction OH group alkyne. This led small increase roughness as well hydrophobicity this effect was...
We present a parametric modeling of the thermoelectric transport coefficients based on model previously used to interpret experimental measurements conductivity, σ, and Seebeck coefficient, S, in highly Boron-doped polycrystalline Si, where very significant power factor (TPF) enhancement was observed. have derived analytical formalism for presence an energy barrier assuming thermionic emission over (i) non-degenerate (ii) degenerate one-band semiconductor. Simple generic equations are found...