TY - JOUR
T1 - The effect of aromatic ring size in electron deficient semiconducting polymers for n-type organic thermoelectrics
AU - Alsufyani, Maryam
AU - Hallani, Rawad
AU - Wang, Suhao
AU - Xiao, Mingfei
AU - Ji, Xudong
AU - Paulsen, Bryan D.
AU - Xu, Kai
AU - Bristow, Helen
AU - Chen, Hu
AU - Chen, Xingxing
AU - Sirringhaus, Henning
AU - Rivnay, Jonathan
AU - Fabiano, Simone
AU - Wadsworth, Andrew
N1 - KAUST Repository Item: Exported on 2020-11-25
Acknowledged KAUST grant number(s): OSR-2018-CARF/CCF-3079, OSR-2015-CRG4-2572, OSR4106 CPF2019
Acknowledgements: The research reported in this publication was supported by funding from King Abdullah University of Science and Technology Office of Sponsored Research (OSR) under awards no. OSR-2018-CARF/CCF-3079, no. OSR-2015-CRG4-2572 and OSR4106 CPF2019. We acknowledge EC FP7 Project SC2 (610115), EC H2020 (643791), and EPSRC Projects EP/G037515/1, EP/M005143/1, and EP/L016702/1. X. D., B. P., and J. R. gratefully acknowledge support from the National Science FoundationGrant No. NSF DMR-1751308. Special thanks to Joseph Strzalka and Qingteng Zhang for beam line assistance. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory
under Contract No. DE-AC02-06CH11357. S. F. acknowledges the Swedish Research Council (2016-03979), ÅForsk (18-313,19-310), Olle Engkvists Stiftelse (204-0256), and the Advanced Functional Materials Center at Linko¨ping University (2009-00971)
for financial support.
PY - 2020
Y1 - 2020
N2 - N-type semiconducting polymers have been recently utilized in thermoelectric devices, however they have typically exhibited low electrical conductivities and poor device stability, in contrast to p-type semiconductors, which have been much higher performing. This is due in particular to the n-type semiconductor's low doping efficiency, and poor charge carrier mobility. Strategies to enhance the thermoelectric performance of n-type materials include optimizing the electron affinity (EA) with respect to the dopant to improve the doping process and increasing the charge carrier mobility through enhanced molecular packing. Here, we report the design, synthesis and characterization of fused electron-deficient n-type copolymers incorporating the electron withdrawing lactone unit along the backbone. The polymers were synthesized using metal-free aldol condensation conditions to explore the effect of enlarging the central phenyl ring to a naphthalene ring, on the electrical conductivity. When n-doped with N-DMBI, electrical conductivities of up to 0.28 S cm-1, Seebeck coefficients of -75 μV K-1 and maximum Power factors of 0.16 μW m-1 K-2 were observed from the polymer with the largest electron affinity of -4.68 eV. Extending the aromatic ring reduced the electron affinity, due to reducing the density of electron withdrawing groups and subsequently the electrical conductivity reduced by almost two orders of magnitude. This journal is
AB - N-type semiconducting polymers have been recently utilized in thermoelectric devices, however they have typically exhibited low electrical conductivities and poor device stability, in contrast to p-type semiconductors, which have been much higher performing. This is due in particular to the n-type semiconductor's low doping efficiency, and poor charge carrier mobility. Strategies to enhance the thermoelectric performance of n-type materials include optimizing the electron affinity (EA) with respect to the dopant to improve the doping process and increasing the charge carrier mobility through enhanced molecular packing. Here, we report the design, synthesis and characterization of fused electron-deficient n-type copolymers incorporating the electron withdrawing lactone unit along the backbone. The polymers were synthesized using metal-free aldol condensation conditions to explore the effect of enlarging the central phenyl ring to a naphthalene ring, on the electrical conductivity. When n-doped with N-DMBI, electrical conductivities of up to 0.28 S cm-1, Seebeck coefficients of -75 μV K-1 and maximum Power factors of 0.16 μW m-1 K-2 were observed from the polymer with the largest electron affinity of -4.68 eV. Extending the aromatic ring reduced the electron affinity, due to reducing the density of electron withdrawing groups and subsequently the electrical conductivity reduced by almost two orders of magnitude. This journal is
UR - http://hdl.handle.net/10754/666089
UR - http://xlink.rsc.org/?DOI=D0TC03347B
UR - http://www.scopus.com/inward/record.url?scp=85096239004&partnerID=8YFLogxK
U2 - 10.1039/d0tc03347b
DO - 10.1039/d0tc03347b
M3 - Article
SN - 2050-7526
VL - 8
SP - 15150
EP - 15157
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
IS - 43
ER -