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Identifier 000417961
Title Advanced interface engineering for solution -processable photovoltaics
Alternative Title Προηγμένη διεπιφανειακή βελτιστοποίηση για φωτοβολταϊκά επεξεργασμένα σε διάλυμα
Author Κακαβελάκης, Γεώργιος
Thesis advisor Κιοσέογλου, Γεώργιος
Reviewer Κυμάκης, Εμμανουήλ
Πετρίδης, Κωνσταντίνος
Πελεκάνος, Νικόλαος
Κουτσολέλος, Αθανάσιος
Σταθάτος, Ηλίας
Στεργιόπουλος, Θωμάς
Abstract Solution processed solar cells based on organic bulk heterojunction and metal halide perovskite photoactive layers are considered among the most promising third generation photovoltaic technologies due to their short energy payback times. The major bottleneck of organic and perovskite solar cells is the non-existence of standardized interface materials and active layer components with low losses and long-term stability. Developing a novel concept for solution processed, reliable, cost efficient, and improved photoactive and charge transporting materials which do not compromise efficiency, stability and scalability, becoming of paramount importance. The first part of the experimental work of this thesis reports the exploitation of chemical and laser fabricated plasmonic metal nanoparticles in solution processed photovoltaics. On the one hand, OSCs with significantly enhanced PCEs (exceeding 8%) have been demonstrated by doping the rear TiOx ETL with Au NRs to enhance light trapping within the BHJ layer. The enhanced light trapping is systematically investigated through detailed processing, characterization, microscopy, and device optimization, as well as detailed numerical simulations. One the other hand, laser generated metal NPs were successfully added in the PEDOT:PSS HTL of planar inverted PSCs. The introduction of Ag and Au NPs in HTL resulted in a significant PCE enhancement of PSCs, while, the addition of Al NPs in the HTL significantly extended device stability upon prolonged illumination under ambient conditions. The second part of the experimental work of this thesis reports the exploitation of graphene-related-materials and transition metal dichalcogenides in solution processed photovoltaics. In particular, we demonstrated how the WF tuning of the buffer layers can affect the performance of OSC devices. Furthermore, we have demonstrated the impact of WSe2 flake morphological properties on the performance of BHJ OSCs. Moreover, rGO was successfully added in the PCBM ETL of planar inverted PSCs. The introduction of rGO in PCBM resulted in a hysteresis-free and high efficient (14.5%) PSC, with significantly extended stability in prolonged illumination under ambient air. Finally, we demonstrated that the introduction of solution- processed MoS2 flakes between the PTAA HTM and the MAPbI3 absorber is an effective approach to enhance the PCE of inverted PSCs, achieving a record PCE of ≈17%. Besides, MoS2 significantly improved the stability of encapsulated devices stressed in ambient conditions under MPPT.
Language English
Subject Organic photovoltaics
Perovskite solar cells
Μεταλικά νανοσωματίδια
Issue date 2018-07-20
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Materials Science and Technology--Doctoral theses
  Type of Work
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