Enhanced conductivity and photoresponse at a rubrene single-crystal-PCBM film interface
authors Pinto, RM; Macoas, EMS; Alves, H
journal JOURNAL OF MATERIALS CHEMISTRY C
keywords CHARGE-TRANSFER INTERFACES; SOLAR-CELLS; ORGANIC SEMICONDUCTORS; EXCITON DISSOCIATION; QUANTUM EFFICIENCY; ELECTRON-ACCEPTOR; TRANSISTORS; POLYMER; PERFORMANCE; MOLECULES
abstract A large photoresponse is observed at the interface between a highly ordered rubrene single-crystal and an amorphous fullerene film, with responsivity values 300 times higher than the corresponding bulk-heterojunctions and an isolated single-crystal. The rubrene-PCBM interface displays a wide range photoresponse, particularly enhanced in the red part of the visible spectrum presenting an exceptionally high photogeneration yield for lower excitation energies. Increased dark conductivity and electronic structure calculations indicate a polarization effect that reduces the band-gap and assists interfacial exciton separation to donor and acceptor layers well apart, minimizing electron-hole recombination. Wavelengthdependent photoconductivity and thickness-dependent absorption measurements, supported by computational analysis, show that primary excitons formed in rubrene and PCBM evolve to excitons which are effectively separated at the interface. Our results provide important insights into harnessing excitons generated in both the electron donor and acceptor materials increasing the efficiency in organic devices.
publisher ROYAL SOC CHEMISTRY
issn 2050-7526
year published 2014
volume 2
issue 18
beginning page 3639
ending page 3644
digital object identifier (doi) 10.1039/c4tc00051j
web of science category Materials Science, Multidisciplinary; Physics, Applied
subject category Materials Science; Physics
unique article identifier WOS:000334998900021
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 7.059
5 year journal impact factor 6.404
category normalized journal impact factor percentile 85.94
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg