Kelvin Probe Force Microscopy Study of the Photogeneration of Surface Charges in Polymer Photovoltaic Film

Abstract:

The electronic structure and photoinduced surface/interface charge transfer processes have been studied in poly [2-methoxy-5-(28-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) thin films spin-coated on Au using Kelvin Probe Force Microscopy. The results show that the MEH-PPV film,dissolved at about 1% weight/volume in Chloroform (CHCl3), is a n-type semiconductor with an optical band gap of around 2.1 eV and a surface work function of 4.6 eV. MEH-PPV was also dissolved in chlorobenzene (CB) with the same concentration as the CHCl3 solution, is a p-type semiconductor with an optical band gap of around 2.1 eV and a surface work function of 4.75 eV, and its photovoltaic response is dominated by its free surface rather than the interface with the substrate.

• Periodical: Advanced Materials Research (Volume 1094)
• Pages: 72-75
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1094.72
• Online since: March 2015
• Authors: Si Shen, Pan Pan Zhang, Chun Xia Zhang, Bo Nan Kang*
• Keywords: Kelvin Probe Force Microscopy, MEH-PPV, Surface Photovoltage Spectroscopy (SPS)

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