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RISS 인기검색어
- 검색키워드
- 저자 : Bertoluzzi, Luca (검색결과 3 건)
- 무료
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Bertoluzzi, Luca,Sanchez, Rafael S.,Liu, Linfeng,Lee, Jin-Wook,Mas-Marza, Elena,Han, Hongwei,Park, Nam-Gyu,Mora-Sero, Ivan,Bisquert, Juan The Royal Society of Chemistry 2015 ENERGY AND ENVIRONMENTAL SCIENCE Vol.8 No.3
<P>Despite the large photovoltaic performance recently achieved, many aspects of the working principles of hybrid organic–inorganic perovskite solar cells remain to be unveiled. We analyze the experimental features observed in the decay of photovoltage and provide an interpretation of the different depolarization regimes at distinct time scales. We introduce an instantaneous relaxation time that shows the type of relaxation for each separate mechanism. The decay of photovoltage is characterized by electronic events at the ms time scale followed by a power law relaxation in the 10–100 s time window. The latter process is associated with the slow dielectric relaxation of CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> perovskite and it points to cooperative kinetics of polarization and depolarization of ferroelectric domains. These findings provide an important tool for interpretation of kinetic features in the perovskite ferroic solar cells.</P> <P>Graphic Abstract</P><P>Power law voltage decay in perovskite solar cells shows cooperative relaxation phenomena. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4ee03171g'> </P>
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Shi, Xinjian,Herraiz-Cardona, Isaac,Bertoluzzi, Luca,Lopez-Varo, Pilar,Bisquert, Juan,Park, Jong Hyeok,Gimenez, Sixto The Royal Society of Chemistry 2016 Physical chemistry chemical physics Vol.18 No.13
<P>WO3-BiVO4 n-n heterostructures have demonstrated remarkable performance in photoelectrochemical water splitting due to the synergistic effect between the individual components. Although the enhanced functional capabilities of this system have been widely reported, in-depth mechanistic studies explaining the carrier dynamics of this heterostructure are limited. The main goal is to provide rational design strategies for further optimization as well as to extend these strategies to different candidate systems for solar fuel production. In the present study, we perform systematic optoelectronic and photoelectrochemical characterization to understand the carrier dynamics of the system and develop a simple physical model to highlight the importance of the selective contacts to minimize bulk recombination in this heterostructure. Our results collectively indicate that while BiVO4 is responsible for the enhanced optical properties, WO3 controls the transport properties of the heterostructured WO3-BiVO4 system, leading to reduced bulk recombination.</P>
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Germanium coating boosts lithium uptake in Si nanotube battery anodes
Haro, Marta,Song, Taeseup,Guerrero, Antonio,Bertoluzzi, Luca,Bisquert, Juan,Paik, Ungyu,Garcia-Belmonte, Germà The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.33
<P>Si nanotubes for reversible alloying reaction with lithium are able to accommodate large volume changes and offer improved cycle retention and reliable response when incorporated into battery anodes. However, Si nanotube electrodes exhibit poor rate capability because of their inherently low electron conductivity and Li ion diffusivity. Si/Ge double-layered nanotube electrodes show promise to improve structural stability and electrochemical kinetics, as compared to homogeneous Si nanotube arrays. The mechanism explaining the enhancement in the rate capabilities is revealed here by means of electrochemical impedance methods. The Ge shell efficiently provides electrons to the active materials, which increase the semiconductor conductivity thereby assisting Li<SUP>+</SUP> ion incorporation. The charge transfer resistance which accounts for the interfacial Li<SUP>+</SUP> ion intake from the electrolyte is reduced by two orders of magnitude, indicating the key role of the Ge layer as an electron supplier. Other resistive processes hindering the electrode charge–discharge process are observed to show comparable values for Si and Si/Ge array electrodes.</P> <P>Graphic Abstract</P><P>Interfacial charge transfer resistance accounting for Li intake extremely reduced by conductive germanium coating of Si nanotubes. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp02377c'> </P>
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