STRUCTURE AND ELECTRONIC PROPERTIES OF SELF-ASSEMBLED MACROCYCLE AND POLYMER MULTILAYERS

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Our results from optical absorption and surface external reflection FTIR reveal that we can grow self-assembled multilayers consisting of electron acceptors like OHBP and donors like NiPc. In order to investigate the evolution of the surface physical properties of self-assembled multilayers, we applied Kelvin probe techniques and surface photovoltage spectroscopy to monitor the growth of self-assembled OHBP and NiPc systems. Kelvin probe results indicate that the surface electronic potential is very sensitive to the presence of self-assembled molecular layers on surfaces. We find that there is an approximately constant gap of 350 meV between the surface work function of OHBP ... continued below

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LI, L. S. & LI, A. D. Q. May 1, 2001.

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Our results from optical absorption and surface external reflection FTIR reveal that we can grow self-assembled multilayers consisting of electron acceptors like OHBP and donors like NiPc. In order to investigate the evolution of the surface physical properties of self-assembled multilayers, we applied Kelvin probe techniques and surface photovoltage spectroscopy to monitor the growth of self-assembled OHBP and NiPc systems. Kelvin probe results indicate that the surface electronic potential is very sensitive to the presence of self-assembled molecular layers on surfaces. We find that there is an approximately constant gap of 350 meV between the surface work function of OHBP and NiPc terminated self-assembled multilayers. In other words, the surface work function or surface electronic potentials is a periodic function of the terminating layer, oscillating between {approximately}450 mV for OHBP layers and {approximately}100 mV for NiPc layers. On the other hand, the photo-induced effects can be also correlated to the terminating layer of the OHBP-NiPc system. This shows that the self-assembled layers also control the photo-induced effects to some extent. Over the whole excitation spectrum (300-710 nm), the photo-induced band bending change oscillates between two values mostly governed by the properties of the terminating layer of the self-assembled systems.

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277 Kilobytes pages

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  • Report No.: LA-UR-01-2637
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 780813
  • Archival Resource Key: ark:/67531/metadc724947

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  • May 1, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • March 23, 2016, 7:52 p.m.

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LI, L. S. & LI, A. D. Q. STRUCTURE AND ELECTRONIC PROPERTIES OF SELF-ASSEMBLED MACROCYCLE AND POLYMER MULTILAYERS, article, May 1, 2001; New Mexico. (digital.library.unt.edu/ark:/67531/metadc724947/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.