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Identifier	000410380
Title	Ternary organic solar cells incorporating organic and two-dimensional materials.
Alternative Title	Τριαδικές οργανικές φωτοβ/κές διατάξεις
Author	Τζουρμπάκης, Παύλος
Thesis advisor	Κιοσέογλου, Γεώργιος
Reviewer	Κυμάκης, Εμμανουήλ Πετρίδης, Κωνσταντίνος
Abstract	Three different ternary bulk-heterojunction (BHJ) organic Photovoltaic (OPV) devices were systematically studied. First, a 2D-nanomaterial, (Tungsten Diselenide, WSe2) and a small molecule (Compound T) were added into the PTB7:PC71BM binary device, forming a Ternary device. A maximum PCE of 8.78% was achieved upon the incorporation of M-WSe2 flakes having lateral size in the 30-50 nm range, which is one of highest PCE reported for OPVs with PTB7 as the polymer donor. The enhancement is primarily attributed to the synergistic effect of complementary absorption and charge transfer processes. Excitons can be also generated inside the M-WSe2 nanoflakes, increasing the overall exciton generation due to the complementary absorption bands of PTB7 and WSe2. Next, a conjugated small molecule 4,7- dithienbenzothiadiazole (T) was incorporated as the third component, PCE was improved by 5.5% reaching a maximum value of 8.11%, due to cascade charge transfer. Finally, the photovoltaic parameters of six novel Low Band gap (LBG) polymers were determined for the first time. In this context, RGO nanoflakes were incorporated to dope the most efficient LBG polymer among these, resulting to conductivity increase by 60% and a PCE of 4.5%, improved by 8.5%, compared to the reference cell. The improved conductivity was the motivation for a future hybrid integrated solar cell fabrication, where this ternary active layer would be undoubtedly applied as a second active material onto the highly efficient perovskite wide band gap layer.
Language	English
Issue date	2017-07-21
Collection	School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
	Type of Work--Post-graduate theses
Permanent Link	https://elocus.lib.uoc.gr//dlib/d/f/f/metadata-dlib-1499943378-309710-8560.tkl
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