Morphology Change of C60 Islands on Organic Crystals Observed by Atomic Force Microscopy

Organic-organic heterojunctions are nowadays highly regarded materials for light-emitting diodes, field-effect transistors, and photovoltaic cells with the prospect of designing low-cost, flexible, and efficient electronic devices.1-3 However, the key parameter of optimized heterojunctions relies on the choice of the molecular compounds as well as on the morphology of the organic-organic interface,4 which thus requires fundamental studies. In this work, we investigated the deposition of C60 molecules at room temperature on an organic layer compound, the salt bis(benzylammonium)bis(oxalato)cupurate(II), by means of noncontact atomic force microscopy. Three-dimensional molecular islands of C60 having either triangular or hexagonal shapes are formed on the substrate following a "Volmer-Weber" type of growth. We demonstrate the dynamical reshaping of those C60 nanostructures under the local action of the AFM tip at room temperature. The dissipated energy is about 75 meV and can be interpreted as the activation energy required for this migration process.

The effects of ions in colloidal systems,

Mode of access: Internet.

Crystals : [a collection of pamphlets and reprints by various authors].

Title from spine.

Photoelectronic properties of zinc phosphide crystals, films and heterojunctions : quarterly progress report no. 6 for the period July 1 - September 30, 1980 /

The purpose of this research program is to investigate the photoelectronic properties of zinc phosphide (Zn₃P₂ in single crystal form, in thin-film form, and in heterojunctions in which Zn₃P₂ forms one of the elements. This research will be directed toward understanding the role of crystalline defects and impurities in Zn₃P₂, the nature of the electronic charge transport in single crystal and thin-film material, and the properties of photovoltaic heterojunctions involving Zn₃P₂. The scope of the program extends from basic investigations of materials properties on single crystals to the preparation and characterization of all-thin-film heterojunction divices. One of the principal motivations behind this research program is the realization that Zn₃P₂ is a relatively uninvestigated yet ideal component for photovoltaic heterojunction use in solar energy conversion. The proposed program will concentrate on the basic materials problems involved with Zn₃P₂, providing the kind of information needed for other more developmental programs directed toward actual practical cells.

On a tabulation of reduced binary quadratic forms of a negative determinant,

The author's thesis (Ph.D.)--University of California, 1913.

Experiments in the use of the electrochemical cell as a binary memory element /

Includes bibliographical references.

Error detection and correction in binary parallel digital computers /

"Retyped October, 1964"

Calculation of GFSR pseudorandom number binary starting matrix,

Mode of access: Internet.

Biological removal of colloidal waste in activated sludge process /

Vita.

A class of algorithms for automatic evaluation of certain elementary functions in a binary computer.

"Supported in part...under Grant No. US NSF GJ812 and Grant No. US NSF GJ813."

Generating binary trees lexicographically /

Bibliography: p. 26.

Destabilization-aggregation of dilute colloidal suspensions by polyelectrolytes.

Vita.