Browsing by Author "Lioudakis, Emmanouil E."
Now showing items 21-31 of 31
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Temporal evolution of effects of ultrafast carrier dynamics in In 0.33Ga0.67N: Above and near the bandgap
Lioudakis, Emmanouil E.; Iliopoulos, Eleftherios; Georgakilas, A.; Othonos, Andreas S. (2007)Ultrafast carrier dynamics in the In0.33Ga0.67N epilayer were investigated in detail, using femtosecond transient differential non-degenerate optical absorption measurements. Following an excitation at 400 nm with fluence ...
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Time-resolved ultrafast carrier dynamics in as-grown nanocrystalline silicon films: The effect of film thickness and grain boundaries
Lioudakis, Emmanouil E.; Othonos, Andreas S. (2008)In this letter, we have studied transient photoinduced absorption in as-grown nanocrystallinc silicon films with thickness varied from 5 to 30 nm. Effects of quantum confinement (QC) in z-direction and grain boundary ...
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Transient photoinduced absorption in ultrathin as-grown nanocrystalline silicon films
Lioudakis, Emmanouil E.; Othonos, Andreas S.; Lioutas, Ch B.; Vouroutzis, N. (2008)We have studied ultrafast carrier dynamics in nanocrystalline silicon films with thickness of a few nanometers where boundary-related states and quantum confinement play an important role. Transient non-degenerated ...
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Ultrafast carrier dynamics in band edge and broad deep defect emission ZnSe nanowires
Othonos, Andreas S.; Lioudakis, Emmanouil E.; Philipose, U.; Ruda, H. E. (2007)Ultrafast carrier dynamics of ZnSe nanowires grown under different growth conditions have been studied. Transient absorption measurements reveal the dependence of the competing effects of state filling and photoinduced ...
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Ultrafast carrier dynamics in highly implanted and annealed polycrystalline silicon films
Lioudakis, Emmanouil E.; Nassiopoulou, Androula Galiouna; Othonos, Andreas S. (2005)We have studied the ultrafast optical response of highly implanted and annealed polycrystalline silicon films. One-micron thin polycrystalline silicon samples-on-quartz implanted with As ions at a high dose of 2 × 10 16 ...
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Ultrafast carrier dynamics in Inx Ga1-x N (0001) epilayers: Effects of high fluence excitation
Lioudakis, Emmanouil E.; Othonos, Andreas S.; Dimakis, Emmanouil; Iliopoulos, Eleftherios; Georgakilas, A. (2006)Ultrafast carrier dynamics in Inx Ga1-x N (0001) epilayers were investigated, using femtosecond transient differential transmission and reflection measurements for x=0.07, 0.15, and 0.33, over a fluence range of 1-12 mJ ...
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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 ...
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Ultrafast time-resolved spectroscopy of Si nanocrystals embedded in SiO2 matrix
Lioudakis, Emmanouil E.; Emporas, A.; Othonos, Andreas S.; Nassiopoulou, Androula Galiouna (2009)In this work, we present a comprehensive study of ultrafast transient photoinduced absorption of silicon nanocrystals (NCs) embedded in SiO2 matrix. The samples under investigation are single monolayers of Si-NCs embedded ...
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Ultrafast time-resolved spectroscopy of ZnSe nanowires: Carrier dynamics of defect-related states
Othonos, Andreas S.; Lioudakis, Emmanouil E.; Tsokkou, Demetra; Philipose, U.; Ruda, H. E. (2009)In recent years, ZnSe nanowires have been widely investigated for their potential applications in optoelectronics. A typical room temperature photoluminescence spectrum of ZnSe nanowires grown by vapor-liquid-solid growth ...
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Ultrafast transient photoinduced absorption in silicon nanocrystals: Coupling of oxygen-related states to quantized sublevels
Lioudakis, Emmanouil E.; Othonos, Andreas S.; Nassiopoulou, Androula Galiouna (2007)The authors have studied transient photoinduced absorption in single monolayers of oxidized silicon nanocrystals. Transient photoinduced absorption measurements along with optical absorption and photoluminescence (PL) ...