Control of Photovoltaic Devices based on Interfacial Charge-Transfer Transitions between Metal Oxide Semiconductor and Organic Molecules

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Novel organic solar cells based on the surface complexes of TiO_2 and dicyanomethylene compounds(TCNX). were studied to improve the energy conversion efficiency. By introducing four methyl groups being an electron-donating group to TCNQ, the light absorption region could be extended to the near IR region around 900nm. Furthermore, by using alkanediol as a coadsorbent the short-circuit photocurrent density was enhanced to ca. 15mA/cm^2. In addition, by adding guanidinium ions to the electrolyte, the open-circuit voltage was increased. By this research, the energy conversion efficiency was improved to ca. 3. 5%.