title: Improving the performance of colloidal quantum-dot-sensitized solar cells.
abstract: Solar cells based on a mesoporous structure of TiO2 and the polysulfide redox electrolyte were prepared by direct adsorption of colloidal CdSe quantum dot light absorbers onto the oxide without any particular linker. Several factors cooperate to improve the performance of quantum-dot-sensitized solar cells: an open structure of the wide bandgap electron collector, which facilitates a higher covering of the internal surface with the sensitizer, a surface passivation of TiO2 to reduce recombination and improved counter electrode materials. As a result, solar cells of 1.83% efficiency under full 1 sun illumination intensity have been obtained. Despite a relatively large short circuit current (J(sc) = 7.13 mA cm(-2)) and open circuit voltage (V(oc) = 0.53 V), the colloidal quantum dot solar cell performance is still limited by a low fill factor of 0.50, which is believed to arise from charge transfer of photogenerated electrons to the aqueous electrolyte.
authors: Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, E-12071 Castelló, Spain.
authors: Sixto
authors: S
authors: Giménez
authors: Iván
authors: I
authors: Mora-Seró
authors: Lorena
authors: L
authors: Macor
authors: Nestor
authors: N
authors: Guijarro
authors: Teresa
authors: T
authors: Lana-Villarreal
authors: Roberto
authors: R
authors: Gómez
authors: Lina J
authors: LJ
authors: Diguna
authors: Qing
authors: Q
authors: Shen
authors: Taro
authors: T
authors: Toyoda
authors: Juan
authors: J
authors: Bisquert