title: Probing surface states in PbS nanocrystal films using pentacene field effect transistors: controlling carrier concentration and charge transport in pentacene.
abstract: We used a bilayer field effect transistor (FET) consisting of a thin PbS nanocrystals (NCs) film interfaced with vacuum-deposited pentacene to probe trap states in NCs. We interpret the observed threshold voltage shift in context of charge carrier trapping by PbS NCs and relate the magnitude of the threshold voltage shift to the number of trapped carriers. We explored a series of NC surface ligands to modify the interface between PbS NCs and pentacene and demonstrate the impact of interface chemistry on charge carrier density and the FET mobility in a pentacene FET.
authors.affiliation: School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, USA. metalpbn@hongik.ac.kr th358@cornell.edu.
authors.forename: Byoungnam
authors.initials: B
authors.lastname: Park
authors.forename: Kevin
authors.initials: K
authors.lastname: Whitham
authors.forename: Kaifu
authors.initials: K
authors.lastname: Bian
authors.forename: Yee-Fun
authors.initials: YF
authors.lastname: Lim
authors.forename: Tobias
authors.initials: T
authors.lastname: Hanrath