Post-graduate theses
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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
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Τζουρμπάκης, Παύλος
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Thesis advisor
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Κιοσέογλου, Γεώργιος
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Reviewer
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Κυμάκης, Εμμανουήλ
Πετρίδης, Κωνσταντίνος
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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.
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Language |
English |
Issue date |
2017-07-21 |
Collection
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School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
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Type of Work--Post-graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/d/f/f/metadata-dlib-1499943378-309710-8560.tkl
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Views |
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