TiO2 표면 코팅을 통한 염료감응형 태양전지 효율 향상

Abstract

Micrometer-sized polydisperse ZnO spheres consisting of ~25 nm-sized nanoparticles were synthesized using a hydrolysis method for photoelectrodes in dye-sensitized solar cells. Chemically deposited TiO2 layer on the ZnO surface improved both the open-circuit voltage (Voc) and short-circuit current (Jsc). Consequently, these results gave rise to the enhanced power-conversion efficiency (PCE) approximately by a factor of three. Thin layer of TiO2 suppressed the formation of Zn2+/dye complexes due to enhancement of chemical stability against the acidic dye. Furthermore, it acts as a barrier layer, resulting in a reduction of charge recombination at the ZnO/dye/electrolyte interface.