Journal Article organic electrochemical transistors multimaterial fibers thermal drawing Review accumulation mode advanced fibers conjugated polyelectrolytes dynamically gate-tunable transistors flexible and stretchable electronics functional fibers functional textiles hybrid optical fibers mixed ionic‐electronic conductors n‐type semiconductors optoelectronic devices organic electronics reconfigurable logic gate rheology self doping semiconducting nanowires semiconductor fibers sidechain engineering small molecules stretchable electronics thermoplastic elastomers