Assertion: polymer's backbone | /r/CapableOf | carry non-polar alkoxy side chains
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text: To achieve this double doping, we selected polymers with a low IE0 of less than 5 eV, such as particular bithiophene–thienothiophene copolymers with polar oligoethylene glycol side chains, which offer excellent compatibility with molecular dopants12,29,30,31, but also a similar copolymer with the same backbone that carries non-polar alkoxy side chains.