title: Local charge transport in two-dimensional PbSe nanocrystal arrays studied by electrostatic force microscopy.
abstract: Two-dimensional PbSe nanocrystal arrays on silicon nitride membranes were investigated using electrostatic force microscopy (EFM) and transmission electron microscopy (TEM). Changes in lattice and transport properties upon annealing in a vacuum were revealed. Local charge transport behavior was directly imaged by EFM and correlated to nanopatterns observed with TEM. Charge transport through nanochannels in complex two-dimensional nanocrystal networks was identified. Our results demonstrate the importance of measurements of local transport details complementary to the conventional current-voltage (I-V) measurements.
authors.affiliation: Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Zonghai
authors.initials: Z
authors.lastname: Hu
authors.forename: Michael D
authors.initials: MD
authors.lastname: Fischbein
authors.forename: Marija
authors.initials: M
authors.lastname: Drndić
mesh_terms: D003460:Crystallization / Q000379:methods*; D004553:Electric Conductivity; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D004579:Electron Transport; D007854:Lead / Q000032:analysis / Q000737:chemistry*; D008422:Materials Testing; D020527:Microscopy, Scanning Probe / Q000379:methods*; D049329:Nanostructures / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure; D018036:Selenium Compounds / Q000032:analysis / Q000737:chemistry*; D055672:Static Electricity; D013499:Surface Properties
chemical_list: D018036:Selenium Compounds; C088065:lead selenide; D007854:Lead