NDLI: Conjugated polymers based on benzodithiophene and fluorinated quinoxaline for bulk heterojunction solar cells: thiophene versus thieno[3,2-b]thiophene as π-conjugated spacers

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Inside back cover

Back cover

Polymer Chemistry Vol - 5 Issue - 5

Polymer Chemistry Vol - 5 Issue - 4

Polymer Chemistry Vol - 5 Issue - 3

Polymer Chemistry Vol -4

Polymer Chemistry Vol -3

Polymer Chemistry Vol -2

Polymer Chemistry Vol -1

Conjugated polymers based on benzodithiophene and fluorinated quinoxaline for bulk heterojunction solar cells: thiophene versus thieno[3,2-b]thiophene as π-conjugated spacers

Content Provider	Royal Society of Chemistry (RSC)
Author	Tessarolo, Marta Gedefaw, Desta Kroon, Renee Zhuang, Wenliu Wang, Ergang Bolognesi, Margherita Andersson, Mats R. Seri, Mirko Muccini, Michele
Copyright Year	2014
Abstract	Two conjugated donor–acceptor copolymers based on a benzodithiophene donor unit and a fluorinated quinoxaline acceptor unit, spaced with either thiophene or thieno[3,2-b]thiophene π-bridges, were designed and synthesized. The effect of different π-bridges and of the processing conditions on optical, electrical, morphological and photovoltaic properties of the polymer:fullerene blend films were investigated. The polymer containing the thieno[3,2-b]thiophene π-bridge (PBDTFQ-TT) showed a red-shifted absorption and an enhanced charge carrier mobility, as compared to its analogue with the thiophene π-bridge (PBDTFQ-T), due to its narrower optical gap (by ∼0.1 eV) and stronger inter-chain interactions, favored by the structural planarity and increased linearity of the polymer backbone, as also supported by DFT calculations. The blend of PBDTFQ-TT and PC61BM ([6,6]-phenyl-C61-butyric acid methyl ester), compared to the PBDTFQ-T:PC61BM one processed under the same conditions (by blade-coating technique), showed greatly enhanced photovoltaic performance, with more than doubled power conversion efficiency (PCE up to 5.60% for the best device) due to the increased short-circuit current density and fill factor. However, similar PCEs were also achieved for PBDTFQ-T:PC61BM-based devices by optimizing the processing conditions through the addition of 1,8-diiodooctane (DIO) as the solvent additive. Through morphological and electrical analysis of the films, produced with and without additive, it was observed that the addition of DIO greatly enhances the self-organization, and consequently the charge mobility, of the thiophene π-bridge-based polymer, while it was detrimental for the nanoscale morphology and photovoltaic performances of the thieno[3,2-b]thiophene π-bridge-based polymer in the corresponding blend.
Starting Page	2083
Ending Page	2093
Page Count	11
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	5
Issue Number	6
Journal	Polymer Chemistry
DOI	10.1039/c3py01519j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Quinoxaline Charge carrier Electronvolt Polymer Thiophene Phenyl-C61-butyric acid methyl ester Self-organization Solar cell Fullerene Ester Electric current Solvent
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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