Alessandro Romeo

Alessandro Romeo
University of Verona | UNIVR · Department of Computer Science

Phd and Degree in Physics

About

159
Publications
28,729
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
3,535
Citations
Citations since 2016
59 Research Items
1888 Citations
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
Additional affiliations
February 2012 - present
University of Verona
Position
  • Lecturer
Description
  • Physics
October 2004 - present
University of Verona
Position
  • Lecturer
Description
  • Biophysics
January 2004 - present
Università degli studi di Verona
Description
  • Head of the group

Publications

Publications (159)
Chapter
CdTe solar cells are the most successful thin film photovoltaic technology of the last ten years. It was one of the first being brought into production together with amorphous silicon (already in the mid 90 s Solar Cells Inc. in USA, Antec Solar and BP Solar in Europe were producing 60 × 120 cm modules), and it is now the largest in production amon...
Article
Full-text available
We report the first example of very efficient NIR Circularly Polarized Luminescence (CPL) (around 970 nm) in water, obtained thanks to the combined use of a chiral Yb complex and of poly lactic‐co‐glycolic acid (PLGA) nanoparticles. [Yb L (tta) 2 ]CH 3 COO ( L = N, N’‐bis(2‐pyridylmethylidene)‐1,2‐( R,R + S,S ) cyclohexanediamine and tta = 2‐thenoy...
Article
Despite the slow efficiency development, Cu 2 ZnSn(S,Se) 4 still is a promising absorber material for solar cells for its easy and low cost way of fabrication and the abundance of its elements. Similarly, also CdTe faced a long period when the record efficiency would not improve over 16.5% until a different paradigm was introduced. CZTSSe, compared...
Article
Antimony selenide (Sb2Se3) has been developed as attractive, non-toxic and earth-abundant solar absorber candidate among the thin-film photovoltaic devices. The growth of SbxSey thin films, by atmospheric pressure chemical molecular beam deposition (CMBD) method, from separate Sb and Se precursors has been reported. The conductivity of the films wa...
Article
Full-text available
Sb 2 Se 3 is a promising alternative absorber material for thin-film solar cells. However, by a thermal evaporation technique, it appears to partially decompose, leading to Se deficiency. In this work, we propose two alternative routes for the supply of selenium in the deposition of Sb 2 Se 3 thin films. The first method is the co-evaporation of Se...
Article
CdTe thin film solar cells are the most successful thin film photovoltaic devices in terms of production yield. In the last few years, by changing the original solar cell structure, the efficiency was increased from around 17 % up to 22 %. In particular two main innovations have been introduced: a CdSexTe1-x layer, that narrows the band gap of the...
Article
Full-text available
Sb2Se3 thin films have received increasing interest for their applications in optoelectronics. However, technological intervention demands a material-specific understanding of the reactivity to different environments. Both thermal annealing and laser irradiation carried out in an ambient atmosphere are expected to induce changes in the pristine cry...
Article
Full-text available
Cu2ZnSn(S,Se)4 solar cells were fabricated by a non-vacuum solution-based spin coating technique followed by annealing in selenium atmosphere without H2S treatment. The effects of the drying time after spin coating on physical and electrical properties of the cells were investigated. Structural and morphological properties were investigated by X-ra...
Article
In recent years the efficiency of CdTe based solar cells has been significantly improved, mainly by the increase of the short circuit current value. This has been achieved by removing the CdS window layer and by adding a CdSexTe1-x layer, grading the band gap of the CdTe. On the other hand, ultra-thin absorbers allow to reduce the materials impact...
Article
Full-text available
Citation: Vurro, F.; Jabalera, Y.; Mannucci, S.; Glorani, G.; Sola-Leyva, A.; Gerosa, M.; Romeo, A.; Romanelli, M.G.; Malatesta, M.; Calderan, L.; et al. Improving the Cellular Uptake of
Article
Full-text available
CdTe is a very robust and chemically stable material and for this reason its related solar cell thin film photovoltaic technology is now the only thin film technology in the first 10 top producers in the world. CdTe has an optimum band gap for the Schockley-Queisser limit and could deliver very high efficiencies as single junction device of more th...
Article
In instruments for low energetic neutral atom imaging of space plasmas, a charge state conversion surface (CS) is used to convert neutral atoms into ions for detection. We investigated a cadmium telluride (CdTe) coated sample as a novel material candidate regarding its suitability to be used as a CS. We measured the efficiency of converting H and O...
Article
The goal of this paper is to investigate the stability of CdTe solar cells exposed to high temperature storage. In particular, we want to investigate the behavior of cells during short-term degradation test (up to 40 h). Several cells, having different thickness of copper in the contacts and of CdTe absorber were investigated. The results, obtained...
Conference Paper
Full-text available
In the presented work, Antimony selenide (Sb2Se3) based thin films have been grown in superstrate configuration by low temperature thermal evaporation process. For re-incorporation of Se to adjust the stoichiometry and increase crystallization of the absorber has been done in this paper. Solar cells were fabricated in the superstrate configuration...
Conference Paper
Full-text available
CZTS absorber films were prepared by spin-coating technique and the effect of selenization temperature on the structural and morphological properties of the CZTSSe films were studied. After confirming the phase purity of the selenized CZTS films, precursor films were also annealed in different atmosphere including sulphur and selenium+sulphur with...
Conference Paper
Full-text available
The awareness of climate change is growing worldwide and with it, also the request for alternative energy solutions to fossil sources. Photovoltaic energy is one of the main answers, since the technology is well developed and can be installed anywhere. The main challenge in this field, today, is to reduce the costs of the energy produced. In this r...
Chapter
Section 1. Describes the peculiarities of polycrystalline thin film materials with emphasis on CdTe and CIGS. It highlights what are the pros and cons in fabricating photovoltaic devices with these materials.
Article
Full-text available
Exposure to low ozone concentrations is used in medicine as an adjuvant/complementary treatment for a variety of diseases. The therapeutic potential of low ozone concentrations relies on their capability to increase the nuclear translocation of the Nuclear factor erythroid 2-related factor 2 (Nrf2), thus inducing the transcription of Antioxidant Re...
Article
The notion that nanoscale surfaces influence protein conformational transitions stimulates the investigation of fibrillogenic polypeptides adsorbing to nanomaterials. Alpha-synuclein (αS) is a prototypical amyloidogenic protein whose aggregation is associated with severe neurodegenerative disorders. We explored the interaction of αS with silica nan...
Article
Alzheimer unter der Lupe: Semisynthetische und enzymbasierte Konjugationsmethoden wurden verwendet, um die Auswirkungen von Ubiquitin-Modifikationen auf die aberrante Aggregation des Tau-Proteins in neurodegenerativen Zuständen auf molekularer Ebene zu untersuchen. Abstract In the brain of individuals with Alzheimer's disease, the regulatory prote...
Article
In the brain of individuals with Alzheimer's disease, the regulatory protein ubiquitin is found conjugated to different lysine residues of protein tau assembled into pathological paired helical filaments. To shed light on the hitherto unexplored ubiquitination‐linked conformational transitions of tau, the availability of in vitro ubiquitin conjugat...
Article
Full-text available
We have fabricated ZnxSn1−xSe (ZTSe) films for the first time. Samples were fabricated by chemical molecular beam deposition method at atmospheric pressure in hydrogen flow. ZnSe and SnSe powders with 99.999% purity were used as precursors. The temperature of precursors varied in the range of (850–950) °C. Films were deposited at substrate temperat...
Article
Flexible thin film solar cells such as CIGS, CdTe, and a-Si:H have received worldwide attention. Until now, Si solar cells dominate the photovoltaic market. Its production cost is a major concern since Si substrates account for the major cost. One way to reduce the module production cost is to use the low-cost flexible substrates. It reduces the in...
Conference Paper
In the presented work, Antimony selenide (Sb2Se3) thin films with varying thickness (1000, 700 and 500 nm) were prepared by low temperature thermal evaporation method. Solar cells were fabricated in the superstrate configuration of Glass/ITO/ZnO/CdS/Sb2Se3/Cu/Au. Cu addition after the deposition of Sb2Se3, was introduced to improve the back contac...
Conference Paper
Thanks to the high efficiencies achieved and to the low cost of industrial production, CdTe photovoltaic panels are still the main and most promising alternative to traditional silicon cells. In the last few years a solar cell record efficiency of 22.1 % and module efficiency of 18.6% have been achieved, but there is still room for improvement. Act...
Article
Earth-abundancy, nontoxic constituent, along with excellent stability and optoelectronic properties make antimony selenide (Sb2Se3) one of the potential candidate for low cost photovoltaics. In this work, antimony selenide (Sb2Se3) thin films were prepared by low temperature thermal evaporation method and characterized. Solar cells were fabricated...
Chapter
In this paper we propose an image segmentation method specifically designed to detect crystalline grains in microscopic images. We build on the watershed segmentation approach; we propose a preprocessing pipeline to generate a topographic map exploiting the physical nature of the incoming data (i.e. Atomic Force Microscopy) to emphasize grain bound...
Article
In this paper, we investigate the effect of short-term thermal stresses in CdTe thin film solar cells. The CdTe solar cells under test are manufactured with physical vapour deposition on soda lime glass in superstrate configuration. Different characterization techniques were used to study the reliability of the solar cells. In particular, external...
Article
Several Eu(III) complexes [(Eu(L1)(tta)2(H2O)]∙CF3SO3, Eu(L2)(NO3)3 and Eu(L3) with L1 = N, N′-bis(2-pyr- idylmethylidene)-1,2-(R,R+S,S)-cyclohexanediamine, L2 = N, N′-bis(2-quinolylmethylidene)- 1,2-(R,R+S,S)-cyclo- hexanediamine, L3 N-quinolyl-N,N′,N′-trans-l,2-cyclohexylenediaminetriacetic acid and tta = 2-thenoyltri- fluoroacetyl-acetonate] and...
Conference Paper
Full-text available
CdTe solar cells have performed excellent efficiencies up to 22,1%. In order to reach these remarkable values it is very important to reduce or completely remove the parasitic absorbance of the CdS buffer layer. One path is to reduce the thickness and by doing so to allow the light transmittance in the low wavelength region. In this scope, ultra-th...
Conference Paper
Full-text available
CdTe solar cells have shown high efficiency well above 20%. Despite different copper-free back contacts have been successfully introduced this is still required for very high efficiency devices. On the other hand an excessive amount of copper results in degradation of the device and a suitable concentration is very important for a good trade off be...
Article
Full-text available
Photosystem I (PSI) is a pigment binding multi-subunit protein complex involved in the light phase of photosynthesis, catalyzing a light dependent electron transfer reaction from plastocyanin to ferredoxin. PSI is characterized by a photochemical efficiency close to one, suggesting its possible application in light dependent redox reaction in extra...
Article
One of the crucial points in the production of CdTe solar cells is the insertion of copper in the back contact and in the absorber. As demonstrated by the top performing devices presented in literature: copper is necessary for high efficiency devices. However, despite this, copper was found to be a fast diffuser degrading the cell in the long term....
Article
CdTe thinfilm solar cells are the most successful thinfi lm photovoltaic devices in terms of production yield, as attested by the remarkable market performance. Typically the junction is made with n-type CdS that, however, absorbs some of the light spectrum due to its band-gap of 2.4 eV. Therefore, in order to exceed 20% efficiency it is crucial to...
Article
One of the major improvements for CdTe solar cells is the increase of the current density by enhancing the transparency of the buff er layer. CdS, with its 2.4 eV band gap, results in being opaque at low wavelength regions. For this reason, in order to gain in blue and UV light, extremely thin CdS has to be applied, if the buff er is not substitute...
Conference Paper
Full-text available
Magnesium-doped Zinc Oxide (MZO) was used as an alternative high resistance transparent layer for CdS/CdTe thin film solar cells. Thin films of MZO were deposited by RF magnetron sputtering and deposited on an Indium Tin Oxide contact (ITO). Thin film CdTe devices including a MZO high resistance transparent layer deposited at above 300 • C yielded...
Article
Full-text available
This work describes a novel method for the generation of a ketamine nano-delivery, to improve brain blood barrier permeability and increase drug therapeutic window as anaesthetic, analgesic and potential antidepressant. The approach herein described is based on ketamine-loaded poly-lactic-co-glycolic acid (PLGA) nanoparticles coupled to an apolipop...
Article
CdTe photovoltaic technology is one of the first being brought into production together with amorphous silicon (already in the mid 90s Solar Cells Inc. in USA, Antec Solar and BP Solar in Europe were producing 60 × 120cm modules) and it is now the largest in production among thin film solar cells (Photovoltaics Report, 2014).CdTe has high chemical...
Article
SnSe thin films were fabricated the first time by chemical molecular beam deposition (CMBD) in atmospheric pressure hydrogen flow using polycrystalline tin selenium (SnSe) precursors. The morphological and electrical properties of the films were studied as a function of the precursor's composition and the substrate temperature. Experimental data in...
Conference Paper
Full-text available
Tin sulfide is an excellent candidate for the mass production of solar cells as it is composed of abundant and not toxic elements. We have prepared SnS polycrystalline films by a novel technique. This technology allows to transfer atoms from a target of SnS to the substrate due to the generation of plasma from the target, giving enough energy to ha...
Conference Paper
Full-text available
One of the key factors for the success of CdTe solar cells is the so-called "activation" treatment, consisting in depositing a CdCl 2 film on the CdTe layer and subsequent annealing it in air. Recent studies have found MgCl 2 as a good alternative. In this work we have studied devices (exceeding 14% efficiency) prepared by low-substrate temperature...
Article
The activation process using chlorine compounds is considered an important issue in CdTe solar cells technology. For a long time researchers have tried to replace the most successful CdCl2 activator with a non-toxic compound more suitable for industrial production. In the last years many alternatives were presented, among them the most promising is...
Conference Paper
Full-text available
CdTe solar cells have shown high efficiency and the technology is scalable. As a result thin film CdTe modules are competitive with crystalline silicon modules. Thin film CdTe devices with efficiency above 22% have been reported using high substrate temperatures during the deposition process. It is known that high substrate temperatures result in l...
Article
For CdTe solar cells copper seems to be necessary to achieve best energy conversion efficiencies, whilst it is known to be the main reason of cell performance degradation due to its tendency to diffuse through the bulk. Some studies have shown a direct connection between defect concentration and copper, but little has been discussed about its relat...
Article
Full-text available
Thin film solar cells have reached commercial maturity and extraordinarily high efficiency that make them competitive even with the cheaper Chinese crystalline silicon modules. However, some issues (connected with presence of toxic and/or rare elements) are still limiting their market diffusion. For this reason new thin film materials, such as Cu 2...
Article
For targeted brain delivery, nanoparticles (NPs) should bypass the blood-brain barrier (BBB). Novel functionalization strategies, based on low-density lipoprotein receptor (LDLR) binding domain, have been here tested to increase the brain targeting efficacy of poly D, L-lactic-co-glycolic acid (PLGA) NPs, biodegradable and suited for biomedical app...
Article
CdTe thin film solar cells have shown to be competitive in terms of scalability and efficiency, the latest record efficiency exceeds 22%. Because of the CdTe high electron affinity the insertion of copper has demonstrated to deliver the highest efficiency device, however degrading the cell. For this reason other possible degradation effects are gen...
Article
Full-text available
In this paper we present for the first time flexible CdTe solar cells deposited on ultra-thin glass using a low temperature process and compared the results to CdTe cells deposited on polyimides. The effects of the different substrates on the morphology and crystal structure of CdTe absorber layers, as well as on the efficiency of solar cells were...
Conference Paper
Full-text available
Copper is a crucial element for the CdTe doping and consequently for high conversion efficiency. To analyse the effect of copper doping it is necessary to remove it from the back contact in order to avoid uncontrolled copper diffusion in the absorber. Recently, MoO3 has been successfully applied for back contact, because of its work function. In th...
Conference Paper
Full-text available
The limited amount in nature of Te and In and the use of toxic elements like Cd and Se in CdTe and CuInGaSe2 solar devices (despite they have no effect on the environment) could be overcome with alternative thin films. SnS is one of the most promising materials due to its electrical and physical properties, but it is already demonstrated that high...
Conference Paper
Full-text available
In recent times, new earth abundant and non toxic materials, like Cu2ZnSnS4 or SnS, have acquired a considerable interest in the photovoltaic research field. In this work, SnS thin films solar cells were prepared in superstrate configuration by vacuum evaporation of 99.99 % pure SnS compound on a glass/ITO/ZnO/CdS stack substrate heated at several...
Conference Paper
Full-text available
In this paper flexible CdTe solar cells made by vacuum evaporation on ultra thin glass and on two different polyimides are presented. Ultra-thin glass is a very promising flexible substrate for CdTe solar cells in superstrate configuration because of it superior transparency. Cell preparation was optimized for each different substrate. Efficiencies...
Chapter
Full-text available
The efficiency of CdTe solar cells with the absorber layer smaller than 1 µm is analyzed. These devices are made by decreasing the CdTe thickness from the standard 6 µm down to 350 nm. The optimization steps of our low temperature fabrication process based on physical vapor deposition. Our best efficiencies are 3.4% for device with 350 nm of CdTe a...