In:
Nature Communications, Springer Science and Business Media LLC, Vol. 10, No. 1 ( 2019-07-29)
Abstract:
Collective molecular physical properties can be enhanced from their intrinsic characteristics by templating at material interfaces. Here we report how a black phosphorous (BP) substrate concatenates a nearly-free-electron (NFE) like conduction band of a C 60 monolayer. Scanning tunneling microscopy reveals the C 60 lowest unoccupied molecular orbital (LUMO) band is strongly delocalized in two-dimensions, which is unprecedented for a molecular semiconductor. Experiment and theory show van der Waals forces between C 60 and BP reduce the inter-C 60 distance and cause mutual orientation, thereby optimizing the π-π wave function overlap and forming the NFE-like band. Electronic structure and carrier mobility calculations predict that the NFE band of C 60 acquires an effective mass of 0.53–0.70 m e ( m e is the mass of free electrons), and has carrier mobility of ~200 to 440 cm 2 V −1 s −1 . The substrate-mediated intermolecular van der Waals interactions provide a route to enhance charge delocalization in fullerenes and other organic semiconductors.
Type of Medium:
Online Resource
ISSN:
2041-1723
DOI:
10.1038/s41467-019-11300-y
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2019
detail.hit.zdb_id:
2553671-0