Alkyloxime side chain enabled polythiophene donors for efficient organic solar cells

Keqiang He; Pankaj Kumar; Marwa Abd-Ellah; Haitao Liu; Xu Li; Zhifang Zhang; Jinliang Wang; Yuning Li

doi:10.1021/acs.macromol.0c01548

Alkyloxime side chain enabled polythiophene donors for efficient organic solar cells

Keqiang He, Pankaj Kumar, Marwa Abd-Ellah, Haitao Liu, Xu Li, Zhifang Zhang, Jinliang Wang, Yuning Li^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

Electron-withdrawing alkyloxime was, for the first time, used as a novel side chain for conjugated polymers. Two polythiophenes, PTOBT-Z with the Z-isomer alkyloxime side chains and PTOBT-Z/E with a mixture of Z- and E-isomer alkyloxime side chains, were synthesized. They possess deep highest occupied molecular orbital energies (E_HOMO’s) down to -5.44 eV and wide band gaps of up to 1.94 eV, which are desirable donor characteristics for matching the non-fullerene acceptors for organic solar cells (OSCs). In addition, they exhibited excellent field effect hole mobilities of ∼10^-2 cm² V^-1 s^-1. OSCs using PTOBT-Z as the donor and ITIC as the acceptor achieved a high power conversion efficiency of up to 9.04%. Importantly, PTOBT-Z has a very low synthetic complexity of 23.4%. The results strongly demonstrate that alkyloxime groups are a new type of functional solubilizing side chains for developing polymer donors with both high performance and low cost.

Original language	English
Pages (from-to)	8796-8808
Number of pages	13
Journal	Macromolecules
Volume	53
Issue number	20
DOIs	https://doi.org/10.1021/acs.macromol.0c01548
Publication status	Published - 27 Oct 2020
Externally published	Yes

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title = "Alkyloxime side chain enabled polythiophene donors for efficient organic solar cells",

abstract = "Electron-withdrawing alkyloxime was, for the first time, used as a novel side chain for conjugated polymers. Two polythiophenes, PTOBT-Z with the Z-isomer alkyloxime side chains and PTOBT-Z/E with a mixture of Z- and E-isomer alkyloxime side chains, were synthesized. They possess deep highest occupied molecular orbital energies (EHOMO{\textquoteright}s) down to -5.44 eV and wide band gaps of up to 1.94 eV, which are desirable donor characteristics for matching the non-fullerene acceptors for organic solar cells (OSCs). In addition, they exhibited excellent field effect hole mobilities of ∼10-2 cm2 V-1 s-1. OSCs using PTOBT-Z as the donor and ITIC as the acceptor achieved a high power conversion efficiency of up to 9.04%. Importantly, PTOBT-Z has a very low synthetic complexity of 23.4%. The results strongly demonstrate that alkyloxime groups are a new type of functional solubilizing side chains for developing polymer donors with both high performance and low cost.",

author = "Keqiang He and Pankaj Kumar and Marwa Abd-Ellah and Haitao Liu and Xu Li and Zhifang Zhang and Jinliang Wang and Yuning Li",

note = "Publisher Copyright: {\textcopyright} 2020 American Chemical Society.",

year = "2020",

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doi = "10.1021/acs.macromol.0c01548",

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AU - He, Keqiang

AU - Kumar, Pankaj

AU - Abd-Ellah, Marwa

AU - Liu, Haitao

AU - Li, Xu

AU - Zhang, Zhifang

AU - Wang, Jinliang

AU - Li, Yuning

PY - 2020/10/27

Y1 - 2020/10/27

N2 - Electron-withdrawing alkyloxime was, for the first time, used as a novel side chain for conjugated polymers. Two polythiophenes, PTOBT-Z with the Z-isomer alkyloxime side chains and PTOBT-Z/E with a mixture of Z- and E-isomer alkyloxime side chains, were synthesized. They possess deep highest occupied molecular orbital energies (EHOMO’s) down to -5.44 eV and wide band gaps of up to 1.94 eV, which are desirable donor characteristics for matching the non-fullerene acceptors for organic solar cells (OSCs). In addition, they exhibited excellent field effect hole mobilities of ∼10-2 cm2 V-1 s-1. OSCs using PTOBT-Z as the donor and ITIC as the acceptor achieved a high power conversion efficiency of up to 9.04%. Importantly, PTOBT-Z has a very low synthetic complexity of 23.4%. The results strongly demonstrate that alkyloxime groups are a new type of functional solubilizing side chains for developing polymer donors with both high performance and low cost.

AB - Electron-withdrawing alkyloxime was, for the first time, used as a novel side chain for conjugated polymers. Two polythiophenes, PTOBT-Z with the Z-isomer alkyloxime side chains and PTOBT-Z/E with a mixture of Z- and E-isomer alkyloxime side chains, were synthesized. They possess deep highest occupied molecular orbital energies (EHOMO’s) down to -5.44 eV and wide band gaps of up to 1.94 eV, which are desirable donor characteristics for matching the non-fullerene acceptors for organic solar cells (OSCs). In addition, they exhibited excellent field effect hole mobilities of ∼10-2 cm2 V-1 s-1. OSCs using PTOBT-Z as the donor and ITIC as the acceptor achieved a high power conversion efficiency of up to 9.04%. Importantly, PTOBT-Z has a very low synthetic complexity of 23.4%. The results strongly demonstrate that alkyloxime groups are a new type of functional solubilizing side chains for developing polymer donors with both high performance and low cost.

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JO - Macromolecules

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ER -

Alkyloxime side chain enabled polythiophene donors for efficient organic solar cells

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