Browsing by Author "Alexandrou, Ioannis"
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Direct observation of excitons in polymer/carbon nanotube composites at room temperature: The influence of nanotube concentration
Lioudakis, Emmanouil E.; Kanari, C.; Othonos, Andreas S.; Alexandrou, Ioannis (2008)In this work, we have employed spectroscopic ellipsometry technique to study the optical properties of polymer/carbon nanotube (CN) composites as a function of nanotube concentration. Using a two-layer structural model ...
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Femtosecond dynamics in single wall carbon nanotube/poly(3-hexylthiophene) composites
Lioudakis, Emmanouil E.; Othonos, Andreas S.; Alexandrou, Ioannis (2008)Femtosecond transient absorption measurements on single wall carbon nanotube/poly(3-hexylthiophene) composites are used to investigate the relaxation dynamics of this blended material. The influence of the addition of ...
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Monitoring charge exchange in P3HT-nanotube composites using optical and electrical characterisation
Alexandrou, Ioannis; Lioudakis, Emmanouil E.; Delaportas, Dimitrios; Zhao, C. Z.; Othonos, Andreas S. (2009)Charge exchange at the bulk heterojunctions of composites made by mixing single wall nanotubes (SWNTs) and polymers show potential for use in optoelectronic devices such as solar cells and optical sensors. The density/total ...
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Optical properties of conjugated poly(3-hexylthiophene)/ [6,6] -phenyl C61 -butyric acid methyl ester composites
Lioudakis, Emmanouil E.; Othonos, Andreas S.; Alexandrou, Ioannis; Hayashi, Y. (2007)In this work, we present the evolution of optical constants as a function of [6,6] -phenyl C61 -butyric acid methyl ester (PCBM) concentration for conjugated poly(3-hexylthiophene)/ [6,6] -phenyl C61 -butyric acid methyl ...
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Ultrafast carrier dynamics on conjugated poly(3-hexylthiophene)/[6,6]- phenyl C61 -butyric acid methyl ester composites
Lioudakis, Emmanouil E.; Othonos, Andreas S.; Alexandrou, Ioannis; Hayashi, Y. (2007)The authors have studied ultrafast carrier dynamics on poly(3- hexylthiophene)/[6,6]- phenyl C61 -butyric acid methyl ester (PCBM) composites up to 50% PCBM concentration. They have resolved the exciton intraband relaxation ...
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Ultrafast dynamics of localized and delocalized polaron transitions in P3HT/PCBM blend materials: The effects of PCBM concentration
Lioudakis, Emmanouil E.; Alexandrou, Ioannis; Othonos, Andreas S. (2009)Nowadays, organic solar cells have the interest of engineers for manufacturing flexible and low cost devices. The considerable progress of this nanotechnology area presents the possibility of investigating new effects from ...