title: Deep level transient spectroscopy (DLTS) on colloidal-synthesized nanocrystal solids.
abstract: We demonstrate current-based, deep level transient spectroscopy (DLTS) on semiconductor nanocrystal solids to obtain quantitative information on deep-lying trap states, which play an important role in the electronic transport properties of these novel solids and impact optoelectronic device performance. Here, we apply this purely electrical measurement to an ethanedithiol-treated, PbS nanocrystal solid and find a deep trap with an activation energy of 0.40 eV and a density of NT = 1.7 × 10(17) cm(-3). We use these findings to draw and interpret band structure models to gain insight into charge transport in PbS nanocrystal solids and the operation of PbS nanocrystal-based solar cells.
authors.affiliation: Laboratory for Nanoelectronics, Department of Information Technology and Electrical Engineering, Eidgenoessische Technische Hochschule Zurich.
authors.forename: Deniz
authors.initials: D
authors.lastname: Bozyigit
authors.forename: Michael
authors.initials: M
authors.lastname: Jakob
authors.forename: Olesya
authors.initials: O
authors.lastname: Yarema
authors.forename: Vanessa
authors.initials: V
authors.lastname: Wood