| 초록 |
Effects of a polymeric material as a surface modifier on the photovoltaic performance of dye-sensitized solar cells (DSSCs) were studied. Polymer-modified TiO2 films were applied to the photoelectrodes of DSSCs. A control device without any modification showed performance of 712 mV of open-circuit voltage(Voc), 11.90 mA/cm2 of short-circuit current(Jsc), and 70.62% of fill factor (FF), which led to a power conversion efficiency (PCE) of 5.99%, whereas for the device with the polymer-modified TiO2 electrode, the PCE was increased to 7.17% (Voc = 700 mV, Jsc = 14.49 mA/cm2, and FF = 70.68%). It is believed that the polymer modification induced the formation of a surface dipole on the TiO2 photoelectrode, leading to the conduction band edge shift of TiO2 toward a positive direction, and thus to an enhancement in Jsc and a decrease in Voc. |
