title: Evidence for a neutral grain-boundary barrier in chalcopyrites.
abstract: Single grain boundaries in CuGaSe2 have been grown epitaxially. Hall measurements indicate a barrier of 30-40 meV to majority carrier transport. Nevertheless, local surface potential measurements show the absence of space charge around the grain boundary; i.e., it is neutral. Theoretical calculations [Persson and Zunger, Phys. Rev. Lett. 91, 266401 (2003)] have predicted a neutral barrier for the present Sigma3 grain boundary. Thus, we have experimentally shown the existence of a neutral grain-boundary barrier, however, smaller than theoretically predicted.
authors.affiliation: Department of Solar Energy, Hahn-Meitner Institut Berlin, Glienicker Strasse 100, 14109 Berlin, Germany. siebentritt@hmi.de
authors.forename: Susanne
authors.initials: S
authors.lastname: Siebentritt
authors.forename: Sascha
authors.initials: S
authors.lastname: Sadewasser
authors.forename: Mark
authors.initials: M
authors.lastname: Wimmer
authors.forename: Caspar
authors.initials: C
authors.lastname: Leendertz
authors.forename: Tobias
authors.initials: T
authors.lastname: Eisenbarth
authors.forename: Martha Ch
authors.initials: MCh
authors.lastname: Lux-Steiner