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Regioregular Low Bandgap Polymer with Controlled Thieno[3,4-b]thiophene Orientation for High-Efficiency Polymer Solar Cells

Title
Regioregular Low Bandgap Polymer with Controlled Thieno[3,4-b]thiophene Orientation for High-Efficiency Polymer Solar Cells
Authors
Kim, H[Kim, Honggi]Lee, H[Lee, Hyungjin]Seo, D[Seo, Donghyun]Jeong, Y[Jeong, Youngjun]Cho, K[Cho, Keun]Lee, J[Lee, Jaechol]Lee, Y[Lee, Youngu]
DGIST Authors
Kim, H[Kim, Honggi]; Lee, H[Lee, Hyungjin]; Seo, D[Seo, Donghyun]; Jeong, Y[Jeong, Youngjun]; Lee, Y[Lee, Youngu]
Issue Date
2015-04-28
Citation
Chemistry of Materials, 27(8), 3102-3107
Type
Article
Article Type
Article
Keywords
Bulk-HeterojunctionCarrier MobilityConjugated PolymersConversion EfficiencyDegree of CrystallinityEfficiencyEnergy GapHeterojunctionsHigh-EfficiencyLow Bandgap PolymersOrganic PolymersPhotoabsorptionsPolymer Solar Cells (PSCs)Power Conversion EfficienciesSolar CellsThieno[3,4-B]ThiopheneThiophene
ISSN
0897-4756
Abstract
The regioregular p-type copolymer PBDTTT-C-T composed of TT-BDT-TT-BDT repeating units (TT = thieno[3,4-b]thiophene, BDT = benzo[1,2-b:4,5-b']dithoiphene) and perfectly controlled TT orientation was synthesized. The optical, thermal, and electrochemical properties of the regioregular PBDTTT-C-T were characterized and compared with the random PBDTTT-C-T without structural regioregularity. The regioregular PBDTTT-C-T showed lower optical bandgap (1.55 eV) and higher degree of crystallinity compared to the random PBDTTT-C-T. The inverted bulk heterojunction PSCs based on the regioregular PBDTTT-C-T exhibited a power conversion efficiency as high as 7.79%, which is 19% higher than the random PBDTTT-C-T-based PSCs. It was found that the improved photoabsorption and increase in charge carrier mobility due to high regioregularity of conjugated polymer backbones and effective ordering between polymer chains are the most likely reasons for enhancement of power conversion efficiency in PSCs. © 2015 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/2908
DOI
10.1021/acs.chemmater.5b00632
Publisher
American Chemical Society
Files:
There are no files associated with this item.
Collection:
Energy Systems EngineeringETC1. Journal Articles
Energy Systems EngineeringOrganic & Printed Electronics Laboratory(OPEL)1. Journal Articles
ETC1. Journal Articles


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