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Regioregular polymers containing benzodithiophene and thienothiophene segments with different electron donating side chains for high-performance polymer solar cells

Title
Regioregular polymers containing benzodithiophene and thienothiophene segments with different electron donating side chains for high-performance polymer solar cells
Authors
Heo, HyojungBan, LyeojinNam, GeonikKim, HonggiJang, SeokhoonLee, Youngu
DGIST Authors
Lee, Youngu
Issue Date
2018-11
Citation
Dyes and Pigments, 158, 249-258
Type
Article
Article Type
Article
Keywords
Cell EngineeringChainsConjugated PolymersHeterojunctionsLight AbsorptionSolar CellsThiopheneBulk Heterojunction (BHJ)Conjugated BackbonesHigh Performance Polymer Solar CellsPoly(Thieno[3 ,4-B]thiophene)Regio-regularSide-chainsThieno[3 ,4-B]thiopheneThiophene GroupPolymer Solar CellsRegioregular PolymerPTB PolymerSide Chain EngineeringAlkylthio Thiophene GroupsDonor-Acceptor PolymersOpen-Circuit VoltagePhotovoltaic PerformanceOrganic PhotovoltaicsEfficiencyCopolymersDithienosiloleAggregationTerpolymers
ISSN
0143-7208
Abstract
This study describes a systematic study on side chain effect in the poly(thieno[3,4-b]thiophene)benzo[1,2-b:4,5-b′]dithiophene (PTB) polymer series based regioregular polymers with D1-A-D2-A configuration, denoted as PTT-BDT(R1)-TT-BDT(R2). The synthesized three regioregular polymers employ the same conjugated backbone but with different side chains (R1, R2), P1; hexyldecyl thiophene (HD, R1) and ethylhexyl thiophene (EH, R2), P2; hexyldecyl thiophene (HD, R1) and ethylhexylthio thiophene (S-EH, R2), P3; hexyldecylthio thiophene (S-HD, R1) and ethylhexylthio thiophene (S-EH, R2). Introduction of different side chains influenced optical, electrochemical, molecular packing properties, and device performance. The P3 polymer with alkylthio thiophene groups as R1 and R2 showed much broader light absorption and lower HOMO level than other polymers with relatively less alkylthio thiophene groups. Furthermore, the P3 polymer exhibited favorable polymer orientation and short π-π stacking distance for efficient charge transport in the BHJ PSCs. The P3 based bulk-heterojunction (BHJ) polymer solar cell (PSC) showed an improved PCE of 7.20% while the P1 and P2 based BHJ PSC devices showed PCEs of 5.27% and 6.45%, respectively. This result, within our knowledge, is the highest record among BHJ PSCs based PTB polymer series composed of benzo[1,2-b:4,5-b']dithiophene (BDT) segment and non-fluorinated alkyl ester (COOR) side chain substituted thieno[3,4-b]thiophene (TT) segment. © 2018
URI
http://hdl.handle.net/20.500.11750/6584
DOI
10.1016/j.dyepig.2018.05.047
Publisher
Elsevier Ltd
Related Researcher
  • Author Lee, Youngu Organic & Printed Electronics Laboratory(OPEL)
  • Research Interests OTF Solar cell; OLED; Printed Electronics; 유기박막형 태양전지; OLED; Printed Electronics
Files:
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Collection:
Department of Energy Science and EngineeringOrganic & Printed Electronics Laboratory(OPEL)1. Journal Articles


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