Studies on photovoltaic characteristics of hemin and its organized assembly by surface photovoltage spectroscopy

摘要

The photovoltaic behaviors of hemin and its organized assembly prepared by Langmuir-Blodgett (LB) technique were studied by surface photovoltage spectroscopy (SPS) and electric field induced surface photovoltage spectroscopy (FEISPS). The SPS of the hemin powder exhibited a strong response originated from the Soret band and a weak response from the Q band. After hemin and the mixture of hemin and n-octadecylamine (ODA) were deposited onto ITO glasses as the thin films by LB technique, the photovoltaic responses became very weak in the whole UV-vis region when no external bias was applied. As the positive external electric field was applied, both pure hemin and the mixture of hemin and ODA LB films showed a strong photovoltaic response at 340 nm. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 18]