화학공학소재연구정보센터
Journal of Power Sources, Vol.272, 886-894, 2014
Low-temperature synthesis of tin dioxide hollow nanospheres and their potential applications in dye-sensitized solar cells and photoelectrochemical type self-powered ultraviolet photodetectors
Tin dioxide hollow nanospheres (SnO2 HNSs) are synthesized via a fast, template/surfactant-free and low-temperature (100 degrees C) solution route. These spheres consist of packed SnO2 nanocrystals, implying good intercrystal-line connections and effective light absorption. In view of these advantageous features inherited from the prepared SnO2 HNSs, TiO2 coated SnO2 HNSs (SnO2-HNS-TiO2) core-shell structures are used as photoanodes for dye-sensitized solar cells (DSSCs). A high power conversion efficiency (PCE) of 6.54% is achieved from SnO2 HNS-TiO2 DSSC, which increases by 53.8%, 21.5% and 330% as compared with those of the DSSCs based on commercial SnO2 nanoparticle-TiO2, TiO2 nanoparticle (P25) and SnO2 HNS, respectively. The unsensitized SnO2 HNS TiO2 structure also serves as photoanode of the photoelectrochemical type ultraviolet (UV) photodetectors. The PCE of the SnO2 HNS-TiO2 based photodetectors reaches 21.5% at 330 nm, which is more than 2.75 times as large as that of nanocrystalline TiO2 film based UV photodetectors. Moreover, the self-powered UV photodetectors also exhibit a high responsivity of 0.837 A/W, a high on/off ratio of 4021, a rise time of 0.03 s and a decay time of 0.01 s for short-circuit current density signal under UV irradiation. (C) 2014 Elsevier B.V. All rights reserved.