Please use this identifier to cite or link to this item: https://ktisis.cut.ac.cy/handle/10488/14109
Title: Diazaisoindigo bithiophene and terthiophene copolymers for application in field-effect transistors and solar cells
Authors: Du, Weiyuan 
Yue, Wan 
Onwubiko, Ada 
Neophytou, Marios 
Chen, Hu 
McCulloch, Iain
Li, Weiwei 
Chen, Hung Yang 
Tian, Xuelin 
Li, Cheng 
Jellett, Cameron 
Major Field of Science: Engineering and Technology
Field Category: Mechanical Engineering;Materials Engineering
Keywords: Azaisoindigo;Conjugated polymers;Energy loss;Functionalization of polymers;High performance polymers;Solar cells;Solar cells
Issue Date: 15-Aug-2017
Source: Journal of Polymer Science, Part A: Polymer Chemistry, 2017, vol. 55, no. 16, pp. 2691-2699
Volume: 55
Issue: 16
Start page: 2691
End page: 2699
Journal: Journal of Polymer Science 
Abstract: Two donor–acceptor conjugated polymers with azaisoindigo as acceptor units and bithiophene and terthiophene as donor units have been synthesized by Stille polymerization. These two polymers have been successfully applied in field-effect transistors and polymer solar cells. By changing the donor component of the conjugated polymer backbone from bithiophene to terthiophene, the density of thiophene in the backbone is increased, manifesting as a decrease in both ionization potential and in electron affinity. Therefore, the charge transport in field-effect transistors switches from ambipolar to predominantly hole transport behavior. PAIIDTT exhibits hole mobility up to 0.40 cm2/Vs and electron mobility of 0.02 cm2/Vs, whereas PAIIDTTT exhibits hole mobility of 0.62 cm2/Vs. Polymer solar cells were fabricated based on these two polymers as donors with PC61BM and PC71BM as acceptor where PAIIDTT shows a modest efficiency of 2.57% with a very low energy loss of 0.55 eV, while PAIIDTTT shows a higher efficiency of 6.16% with a higher energy loss of 0.74 eV. Our results suggest that azaisoindgo is a useful building block for the development of efficient polymer solar cells with further improvement possibility by tuning the alternative units on the polymer backbone. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 2691–2699.
ISSN: 2642-4169
DOI: 10.1002/pola.28676
Rights: © Wiley
Type: Article
Affiliation : Cyprus University of Technology 
Sun Yat-sen University 
Imperial College London 
Chinese Academy of Science 
King Abdullah University of Science and Technology 
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