title: A new aspect of cyclopentadithiophene based polymers: narrow band gap polymers upon protonation.
abstract: A new aspect of cyclopentadithiophene (CPDT) based conjugated polymers was reported. CPDT units in conjugated polymers can be facilely protonated with a significant change in optical and electronic properties. The protonation was confirmed by NMR spectra studies and the remarkable decrease of the energy band-gap was attributed to charge separation upon protonation.
authors.affiliation: Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore.
authors.forename: Tao
authors.initials: T
authors.lastname: Tang
authors.forename: Tingting
authors.initials: T
authors.lastname: Lin
authors.forename: FuKe
authors.initials: F
authors.lastname: Wang
authors.forename: Chaobin
authors.initials: C
authors.lastname: He