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’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 |
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Pages (from-to) | 8796-8808 |
Number of pages | 13 |
Journal | Macromolecules |
Volume | 53 |
Issue number | 20 |
DOIs | |
Publication status | Published - 27 Oct 2020 |
Externally published | Yes |