Costa Milán, David, Villalvilla, José M., Díaz-García, María A., Untiedt, Carlos
Comparing the distribution of the electronic gap of an organic molecule with its photoluminescence spectrum
Applied Physics Letters. 2013, 102(16): 163307. doi:10.1063/1.4803169
URI: http://hdl.handle.net/10045/33879
DOI: 10.1063/1.4803169
ISSN: 0003-6951 (Print)
Abstract: 
The electronic gap structure of the organic molecule N,N′-diphenyl-N,N′-bis(3-methylphenyl)-(1,1′-biphenyl)-4,4′-diamine, also known as TPD, has been studied by means of a Scanning Tunneling Microscope (STM) and by Photoluminescence (PL) analysis. Hundreds of current-voltage characteristics measured at different spots of the sample show the typical behavior of a semiconductor. The analysis of the curves allows to construct a gap distribution histogram which reassembles the PL spectrum of this compound. This analysis demonstrates that STM can give relevant information, not only related to the expected value of a semiconductor gap but also on its distribution which affects its physical properties such as its PL.
Keywords:STM, Organic molecules, Semiconductor gap, Photoluminescence
American Institute of Physics
info:eu-repo/semantics/article