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김진영

Kim, Jin Young
Next Generation Energy Lab.
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Highly efficient polymer solar cells with a thienopyrroledione and benzodithiophene containing planar random copolymer

Author(s)
Kim, TaehyoLee, Ji YoungHeo, JungwooLim, BogyuKim, Jin Young
Issued Date
2018-03
DOI
10.1039/c8py00037a
URI
https://scholarworks.unist.ac.kr/handle/201301/23917
Fulltext
http://pubs.rsc.org/en/Content/ArticleLanding/2018/PY/C8PY00037A#!divAbstract
Citation
POLYMER CHEMISTRY, v.9, no.10, pp.1216 - 1222
Abstract
We synthesized and characterized a new low band-gap copolymer, PBTTFB, incorporating N-alkylthieno [3,4-c] pyrrole-4,6-dione (TPD) as the acceptor and benzodithiophene (BDT) and (2,5-difluorophenylene) dithiophene as the donor units with S...F and S...O non-covalent intramolecular interactions. The PBTTFB polymer replaced bis(dodecyloxy) benzo[c][1,2,5] thiadiazole (BT) in P1, a previously reported polymer, with 5-dodecyl-4H-thieno[3,4-c] pyrrole-4,6(5H)-dione and exhibited improved macromolecular planarity and molecular ordering of the molecular structure. UV-vis absorption, electrochemical properties, bulk-heterojuction (BHJ) film morphology, and molecular ordering as well as photovoltaic charaterization derived from PBTTFB were studied and analyzed to explore the effect of the thienopyrroledione unit instead of the benzodithiophene unit in the molecular backbone of the polymer. From photovoltaic charaterization, we obtained an enhanced J(sc) value of 14.51 mA cm(-2) from the PBTTFB polymer compared to the Jsc value of 10.54 mA cm(-2) from P1 due to improved macromolecular planarity. Furthermore, PBTTFB exhibited the highest PCE of 8.25% by adding DPE as a processing additive due to better interpenetration networks for improving charge transport and collection.
Publisher
ROYAL SOC CHEMISTRY
ISSN
1759-9954
Keyword
POWER CONVERSION EFFICIENCYHIGH FILL FACTORPHOTOVOLTAIC APPLICATIONSCONJUGATED POLYMERSBANDGAPMORPHOLOGYRECOMBINATIONDEPENDENCEVOLTAGEDESIGN

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