Structural and Electronic Properties of Porphyrins and Phthalocyanines Self Assembled on Conductive Surfaces
Wiggins, Bryan Cortez
MetadataShow full item record
Phthalocyanine and porphyrin compounds are intensively studied for their important physical and electronic properties. These organic compounds possess semiconductor properties that make them great candidates for several thin film applications such as: photovoltaics devices, organic light emitted diodes (OLED), and sensors. Before these compound can be used to construct devices their structural and electronic properties at the molecular level must be understood. Scanning tunneling microscopy (STM) was used to investigate the geometrical structure of the aggregate and/or monolayer of the compound. X-ray photoelectron spectroscopy (XPS) studies show the chemical formation such as film composition and protonation state of nitrogens in the macrocycle ring. Ultraviolet photoelectron (UPS) and scanning tunneling spectroscopy, more specifically orbital mediated tunneling spectroscopy (OMTS) provided more insight into the electronic structure of these compounds. Three different compounds will be discussed in the following, diacid tetrasulfonatophenylporphine H2(H4TSPP), tetrakis (4-sulfonatophenyl) phthalocyanine (TSPc) and metal free naphthalocaynine (H2Nc).