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Dive into the research topics where Dimitris Tsikritzis is active.

Publication


Featured researches published by Dimitris Tsikritzis.


Journal of Materials Chemistry C | 2017

A silanol-functionalized polyoxometalate with excellent electron transfer mediating behavior to ZnO and TiO 2 cathode interlayers for highly efficient and extremely stable polymer solar cells

Marinos Tountas; Yasemin Topal; Apostolis Verykios; Anastasia Soultati; Andreas Kaltzoglou; Theodoros A. Papadopoulos; Florian Auras; Kostas Seintis; Mihalis Fakis; Leonidas C. Palilis; Dimitris Tsikritzis; S. Kennou; Azhar Fakharuddin; Lukas Schmidt-Mende; Spyros Gardelis; Mahmut Kus; Polycarpos Falaras; Dimitris Davazoglou; Panagiotis Argitis; Maria Vasilopoulou

Combining high efficiency and long lifetime under ambient conditions still poses a major challenge towards commercialization of polymer solar cells. Here we report a facile strategy that can simultaneously enhance the efficiency and temporal stability of inverted photovoltaic architectures. Inclusion of a silanol-functionalized organic–inorganic hybrid polyoxometalate derived from a PW9O34 lacunary phosphotungstate anion, namely (nBu4N)3[PW9O34(tBuSiOH)3], significantly increases the effectiveness of the electron collecting interface, which consists of a metal oxide such as titanium dioxide or zinc oxide, and leads to a high efficiency of 6.51% for single-junction structures based on poly(3-hexylthiophene):indene-C60 bisadduct (P3HT:IC60BA) blends. The above favourable outcome stems from a large decrease in the work function, an effective surface passivation and a decrease in the surface energy of metal oxides which synergistically result in the outstanding electron transfer mediating capability of the functionalized polyoxometalate. In addition, the insertion of a silanol-functionalized polyoxometalate layer significantly enhances the ambient stability of unencapsulated devices which retain nearly 90% of their original efficiencies (T90) after 1000 hours.


ACS Applied Materials & Interfaces | 2018

Engineering of Porphyrin Molecules for Use as Effective Cathode Interfacial Modifiers in Organic Solar Cells of Enhanced Efficiency and Stability

Marinos Tountas; Apostolis Verykios; Ermioni Polydorou; Andreas Kaltzoglou; Anastasia Soultati; Nikolaos Balis; Panagiotis A. Angaridis; Michael Papadakis; Vasilis Nikolaou; Florian Auras; Leonidas C. Palilis; Dimitris Tsikritzis; E.K. Evangelou; Spyros Gardelis; Matroni Koutsoureli; George Papaioannou; Ioannis D. Petsalakis; S. Kennou; Dimitris Davazoglou; Panagiotis Argitis; Polycarpos Falaras; Athanassios G. Coutsolelos; Maria Vasilopoulou

In the present work, we effectively modify the TiO2 electron transport layer of organic solar cells with an inverted architecture using appropriately engineered porphyrin molecules. The results show that the optimized porphyrin modifier bearing two carboxylic acids as the anchoring groups and a triazine electron-withdrawing spacer significantly reduces the work function of TiO2, thereby reducing the electron extraction barrier. Moreover, the lower surface energy of the porphyrin-modified substrate results in better physical compatibility between the latter and the photoactive blend. Upon employing porphyrin-modified TiO2 electron transport layers in PTB7:PC71BM-based organic solar cells we obtained an improved average power conversion efficiency up to 8.73%. Importantly, porphyrin modification significantly increased the lifetime of the devices, which retained 80% of their initial efficiency after 500 h of storage in the dark. Because of its simplicity and efficacy, this approach should give tantalizing glimpses and generate an impact into the potential of porphyrins to facilitate electron transfer in organic solar cells and related devices.


Electrochimica Acta | 2013

Electronic properties of semiconducting naphthalene bisimide derivatives—Ultraviolet photoelectron spectroscopy versus electrochemistry

Renata Rybakiewicz; Pawel Gawrys; Dimitris Tsikritzis; Konstantinos Emmanouil; S. Kennou; Malgorzata Zagorska; Adam Pron


Applied Surface Science | 2014

Synthesis and characterization of N-doped TiO2 photocatalysts with tunable response to solar radiation

Athanasia Petala; Dimitris Tsikritzis; Mary Kollia; S. Ladas; S. Kennou; Dimitris I. Kondarides


Applied Catalysis B-environmental | 2016

Correlating the properties of hydrogenated titania to reaction kinetics and mechanism for the photocatalytic degradation of bisphenol A under solar irradiation

Evangelia Ioannidou; Alexandra Ioannidi; Zacharias Frontistis; Maria Antonopoulou; Charalampos Tselios; Dimitris Tsikritzis; Ioannis Konstantinou; S. Kennou; Dimitris I. Kondarides; Dionissios Mantzavinos


Solar Energy Materials and Solar Cells | 2014

Annealing-free solution-processed tungsten oxide for inverted organic solar cells

Frederic Guillain; Dimitris Tsikritzis; George Skoulatakis; S. Kennou; Guillaume Wantz; Laurence Vignau


Nano Energy | 2017

Avoiding ambient air and light induced degradation in high-efficiency polymer solar cells by the use of hydrogen-doped zinc oxide as electron extraction material

Ermioni Polydorou; I. Sakellis; Anastasia Soultati; Andreas Kaltzoglou; Theodoros A. Papadopoulos; Joe Briscoe; Dimitris Tsikritzis; Mihalis Fakis; Leonidas C. Palilis; S. Kennou; Panagiotis Argitis; Polycarpos Falaras; Dimitris Davazoglou; Maria Vasilopoulou


ACS Applied Materials & Interfaces | 2016

Surface Modification of ZnO Layers via Hydrogen Plasma Treatment for Efficient Inverted Polymer Solar Cells.

Papamakarios; Ermioni Polydorou; Anastasia Soultati; N Droseros; Dimitris Tsikritzis; Antonios M. Douvas; Leonidas C. Palilis; Mihalis Fakis; S. Kennou; Panagiotis Argitis; Maria Vasilopoulou


Microelectronic Engineering | 2013

Investigation of naphthalene bisimide derivatives/gold interfaces

Dimitris Tsikritzis; Pawel Gawrys; Malgorzata Zagorska; S. Kennou


Microelectronic Engineering | 2012

An interface study of indium tin oxide on Polyethylene Terephthalate with Nickel Phthalocyanine by photoelectron spectroscopies: The effect of cleaning pretreatment

Dimitris Tsikritzis; Fotini Petraki; S. Kennou

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Anastasia Soultati

National Technical University of Athens

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Marinos Tountas

National Technical University of Athens

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Spyros Gardelis

National and Kapodistrian University of Athens

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Frederic Guillain

Centre national de la recherche scientifique

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Polycarpos Falaras

Centre national de la recherche scientifique

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