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A Facile Method to Enhance Photovoltaic Performance of Benzodithiophene-Isoindigo Polymers by Inserting Bithiophene Spacer

Zaifei Ma ; Dongfeng Dang (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Zheng Tang ; Desta Antenehe Gedefaw (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Jonas Bergqvist ; Weiguo Zhu ; Wendimagegn Mammo ; Mats R. Andersson (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Olle Inganäs ; Fengling Zhang ; Ergang Wang (Institutionen för kemi- och bioteknik, Polymerteknologi)
Advanced Energy Materials (1614-6832). Vol. 4 (2013), 6, p. Art. no. 1301455.
[Artikel, refereegranskad vetenskaplig]

This study describes the synthesis and characterization of four polymers based on benzo[1,2-b:4,5-b']dithiophene (BDT) and isoindigo with zero, one, two, and three thiophene spacer groups. Results have demonstrated that the use of bithiophene as a spacer unit improves the geometry of the polymer chain, making it planar, and hence, potentially enhanced π- π stacking occurs. Due to favorable interaction of the polymer chains, enhanced absorption coefficient, and optimal morphology, PBDT-BTI, which possesses bithiophene as a spacer, revealed high current and fill factor leading to a power conversion efficiency of 7.3% in devices, making this polymer the best performing isoindigo-based material in polymer solar cells (PSCs). Also, PBDT-BTI could still maintain efficiency of over 6% with the active layer thickness of 270 nm, making it a potential candidate for a material in printed PSCs. These results demonstrate that the use of thiophene spacers in D-A polymers could be an important design strategy to produce high-performance PSCs.

Nyckelord: conjugated polymers; energy conversion; fullerenes; photochemistry; solar cells

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Denna post skapades 2013-11-19. Senast ändrad 2016-10-27.
CPL Pubid: 187080


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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Polymerteknologi (2005-2014)


Nanovetenskap och nanoteknik

Chalmers infrastruktur