ΘΕΜΑ: TETY - Παρουσίαση Master Κακαβελάκης Γεώργιος ΑΠΟΣΤΟΛΕΑΣ: Charalampos Stratigis [mailto:stratigis@xxxxxxxxxxxxxxxx] ΠΑΝΕΠΙΣΤΗΜΙΟ ΚΡΗΤΗΣ ΠΑΡΟΥΣΙΑΣΗ ΜΕΤΑΠΤΥΧΙΑΚΟΥ ΔΙΠΛΩΜΑΤΟΣ ΕΙΔΙΚΕΥΣΗΣ Τίτλος «Device engineering for enhanced performance & stability of organic photovoltaics» Κακαβελάκης Γεώργιος Μεταπτυχιακός Φοιτητής Τμήματος Επιστήμης και Τεχνολογίας Υλικών, Πανεπιστημίου Κρήτης Επιβλέπων Καθηγητής κ. Γ. Κιοσέογλου Τρίτη, 28/07/2015, 11:00 π.μ., Πανεπιστήμιο Κρήτης Abstract The effect of metallic (free of surfactants and ligand coated) nanoparticles (NPs) incorporation into different photoactive (P3HT:PCBM, P3HT:ICBA and PCDTBT:PC71BM) and interfacial layers (TiOx) of bulk heterojunction (BHJ) organic photovoltaic (OPV) devices was systematically studied. It was evidenced that the NPs doping gives rise to photovoltaic (PV) efficiency1 and enhanced stability2, thereby minimizing device degradation rate during prolonged illumination. Spectroscopic analysis combined with photon-to-electron conversion efficiency measurements indicate that the efficiency improvement can be attributed to enhanced light harvesting and subsequent exciton generation rate into the photoactive layer. Therefore, this enhancement is attributed to localized surface plasmon resonant absorption (Au NPs) and scattering effects (Al NPs)3. Furthermore, it was demonstrated that the device performance was enhanced only in the case that metal NPs were in direct contact with polymer donor (bare or coated with the same ligand as the donor material)4. On the other hand, the introduction of Au nanorods (NRs) inside the TiOx back contact interfacial layer acts as a mirror in the device structure, increasing exciton generation through back contact scattering and thus charge collection5. The most efficient cells produced in this work incorporating Au NRs into TiOx buffer layer of a PTB7:PC71BM based photoactive layer, demonstrated power conversion efficiency (PCE) of 8.25 %, with Jsc of 17.46 mA/cm2, Voc of 0.76V and FF of 0.62. 1Kakavelakis G., Stratakis E., Kymakis E (2013), RSC Advances, 3 (37), 16288-16291 2 Maria Sygletou, George Kakavelakis, Barbara Paci, Amanda Generosi, Emmanuel Kymakis, Emmanuel Stratakis, (2015) Submitted 3 Kakavelakis G., Stratakis E., Kymakis E., (2014), Chemical Communications, 50 (40), 5285 - 5287 4 Kymakis E., Spyropoulos G.D., Fernandes R., Kakavelakis G., Kanaras A.G., Stratakis E., (2015), ACS Photonics, 2 (6), 714–72 5George Kakavelakis, Ioannis Vaggelidis, Antonios G. Kanaras, Elefterios Lidorikis, Emmanuel Stratakis, Emmanuel Kymakis, (2015) Submitted
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