“…Polypyrrole (PPy) and polythiophene (PTh) can be considered as two widely studied conjugated polymers having five-membered heteroaromatic rings as monomers. − Polyselenophene and polytellurophene (S replaced by Se/Te in PTh) are two lesser known, higher period analogs of PTh which have recently drawn the attention of the research community. , PTh, polyselenophene, and polytellurophene are having various applications, for instance, in photovoltaics, , thin film transistors, biosensors, , batteries, , and memory devices . Polyfuran (S replaced by O in PTh) is a lower period analog of PTh which is less stable compared to PTh. , Successful applications can also be found with polyfuran in photovoltaics and as humidity sensors (the conductivity of polyfuran is sensitive to humidity) . In the case of PPy, replacement of N with P and As has been reported as higher period analogs of PPy .…”