title: Spatially mapping charge carrier density and defects in organic electronics using modulation-amplified reflectance spectroscopy.
abstract: Charge-modulated optical spectroscopy is used to achieve dynamic two-dimensional mapping of the charge-carrier distribution in poly(3-hexylthiophene) thin-film transistors. The resulting in-channel distributions evolve from uniformly symmetric to asymmetrically saturated as the devices are increasingly biased. Furthermore, physical, chemical, and electrical defects are spatially resolved in cases where their presence is not obvious from the device performance.
authors.affiliation: Department of Polymer Science and Engineering, University of Massachusetts Amherst, 120 Governors Dr., Amherst, MA, 01003, USA.
authors.forename: Andrew R
authors.initials: AR
authors.lastname: Davis
authors.forename: Lorelle N
authors.initials: LN
authors.lastname: Pye
authors.forename: Noam
authors.initials: N
authors.lastname: Katz
authors.forename: Janice A
authors.initials: JA
authors.lastname: Hudgings
authors.forename: Kenneth R
authors.initials: KR
authors.lastname: Carter
keywords: conjugated polymers; imaging; modulation spectroscopy