Aiming at High Efficiency Dye-Sensitized Solar Cells—From the View Point of Photoconversion Interface—

Abstract

Researches aiming at high efficiency-dye-sensitized solar cells (DSC) are reviewed from the view point of photoconversion interfaces. Developments of dyes converting photons to electrons in near infrared regions are essential for increasing short circuit current (Jsc). Hybrid cells consisting of double dye structures and double titania layer structures are proposed. Leak currents at photoconversion interfaces decrease open circuit voltage (Voc) and fill factor (FF). Therefore, strategies for decreasing leak currents are essential, especially for all-solid DSCs and I⁻/I₃⁻ free DSCs. Structures of these interfaces are discussed in terms of surface passivation, self-organization, dye structures, interactions between dyes and I₃⁻ in titania nanopores. Fundamental studies for tandem cells are also reported.