The field of organic electronics has been thriving for the last decades due to growing commercial interest. One of the advantages of using organic materials as semiconductors is the possibility to tune their optoelectronic properties in a number of ways. The chemical structure and organization of the individual molecules in the solid state determine the charge and energy transport properties. The chemical structure can be modified by synthesis, whereas the local and long-range arrangement of the individual molecules can be controlled using the principles of molecular self-assembly.
I studied the charge-carrier and excited-state properties in relation to the chemical and supramolecular structure in over hundred organic materials. The charge transport properties were studied by pulse radiolysis time-resolved microwave conductivity (PR-TRMC) measurements and theoretical calculations. The excited state properties were investigated by combining optical spectroscopy with exciton theory calculations. We made significant progress in developing chlorophyll-based p-type biomaterials and perylene diimide n-type materials.
In general, our experimental results indicate that the performance of existing organic electronic devices is not limited by the intrinsic charge transport properties of the active materials. Instead, it is determined by the device parameters such as the choice of the electrodes and the active material, and the contact between these materials. Therefore, there is considerable scope for improving the performance of these devices.
2012 Efficient Charge Transport in Semisynthetic Zinc Chlorin Dye Assemblies
2012 Biosupramolecular Nanowires from Chlorophyll Dyes with Exceptional Charge-Transport Properties
2011 Delocalization and Mobility of Charge Carriers in Covalent Organic Frameworks
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