TY - JOUR
T1 - Chalcogenophene comonomer comparison in small band gap diketopyrrolopyrrole-based conjugated polymers for high-performing field-effect transistors and organic solar cells
AU - Ashraf, Raja Shahid
AU - Meager, Iain
AU - Nikolka, Mark
AU - Kirkus, Mindaugas
AU - Planells, Miquel
AU - Schroeder, Bob C.
AU - Holliday, Sarah
AU - Hurhangee, Michael
AU - Nielsen, Christian Bergenstof
AU - Sirringhaus, Henning
AU - McCulloch, Iain
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was carried out primarily with funding and supports from the X10D Project (EC 287818) and The Leventis Foundation with support from EPSRC (EP/G037515/1 and EP/L016702/1). M.K. acknowledges support from Nano-matcell Project (EU 308997), and M.P. acknowledges support from the Artesun Project (EU 604397).
PY - 2015/1/14
Y1 - 2015/1/14
N2 - The design, synthesis, and characterization of a series of diketopyrrolopyrrole-based copolymers with different chalcogenophene comonomers (thiophene, selenophene, and tellurophene) for use in field-effect transistors and organic photovoltaic devices are reported. The effect of the heteroatom substitution on the optical, electrochemical, and photovoltaic properties and charge carrier mobilities of these polymers is discussed. The results indicate that by increasing the size of the chalcogen atom (S < Se < Te), polymer band gaps are narrowed mainly due to LUMO energy level stabilization. In addition, the larger heteroatomic size also increases intermolecular heteroatom-heteroatom interactions facilitating the formation of polymer aggregates leading to enhanced field-effect mobilities of 1.6 cm2/(V s). Bulk heterojunction solar cells based on the chalcogenophene polymer series blended with fullerene derivatives show good photovoltaic properties, with power conversion efficiencies ranging from 7.1-8.8%. A high photoresponse in the near-infrared (NIR) region with excellent photocurrents above 20 mA cm-2 was achieved for all polymers, making these highly efficient low band gap polymers promising candidates for use in tandem solar cells. (Graph Presented).
AB - The design, synthesis, and characterization of a series of diketopyrrolopyrrole-based copolymers with different chalcogenophene comonomers (thiophene, selenophene, and tellurophene) for use in field-effect transistors and organic photovoltaic devices are reported. The effect of the heteroatom substitution on the optical, electrochemical, and photovoltaic properties and charge carrier mobilities of these polymers is discussed. The results indicate that by increasing the size of the chalcogen atom (S < Se < Te), polymer band gaps are narrowed mainly due to LUMO energy level stabilization. In addition, the larger heteroatomic size also increases intermolecular heteroatom-heteroatom interactions facilitating the formation of polymer aggregates leading to enhanced field-effect mobilities of 1.6 cm2/(V s). Bulk heterojunction solar cells based on the chalcogenophene polymer series blended with fullerene derivatives show good photovoltaic properties, with power conversion efficiencies ranging from 7.1-8.8%. A high photoresponse in the near-infrared (NIR) region with excellent photocurrents above 20 mA cm-2 was achieved for all polymers, making these highly efficient low band gap polymers promising candidates for use in tandem solar cells. (Graph Presented).
UR - http://hdl.handle.net/10754/564023
UR - https://pubs.acs.org/doi/10.1021/ja511984q
UR - http://www.scopus.com/inward/record.url?scp=84921943742&partnerID=8YFLogxK
U2 - 10.1021/ja511984q
DO - 10.1021/ja511984q
M3 - Article
SN - 0002-7863
VL - 137
SP - 1314
EP - 1321
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 3
ER -