title: A facile method to prepare SnO2 nanotubes for use in efficient SnO2-TiO2 core-shell dye-sensitized solar cells.
abstract: A high-efficiency photoelectrode for dye-sensitized solar cells (DSSCs) should combine the advantageous features of fast electron transport, slow interfacial electron recombination and large specific surface area. However, these three requirements usually cannot be achieved simultaneously in the present state-of-the-art research. Here we report a simple procedure to combine the three conflicting requirements by using porous SnO(2) nanotube-TiO(2) (SnO(2) NT-TiO(2)) core-shell structured photoanodes for DSSCs. The SnO(2) nanotubes are prepared by electrospinning of polyvinyl pyrrolidone (PVP)/tin dichloride dihydrate (SnCl(2)·2H(2)O) solution followed by direct sintering of the as-spun nanofibers. A possible evolution mechanism is proposed. The power conversion efficiency (PCE) value of the SnO(2) NT-TiO(2) core-shell structured DSSCs (∼5.11%) is above five times higher than that of SnO(2) nanotube (SnO(2) NT) DSSCs (∼0.99%). This PCE value is also higher than that of TiO(2) nanoparticles (P25) DSSCs (∼4.82%), even though the amount of dye molecules adsorbed to the SnO(2) NT-TiO(2) photoanode is less than half of that in the P25 film. This simple procedure provides a new approach to achieve the three conflicting requirements simultaneously, which has been demonstrated as a promising strategy to obtain high-efficiency DSSCs.
authors.affiliation: School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, Gansu, People's Republic of China. caitiangao10@163.com
authors.forename: Caitian
authors.initials: C
authors.lastname: Gao
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Li
authors.forename: Bingan
authors.initials: B
authors.lastname: Lu
authors.forename: Lulu
authors.initials: L
authors.lastname: Chen
authors.forename: Youqing
authors.initials: Y
authors.lastname: Wang
authors.forename: Feng
authors.initials: F
authors.lastname: Teng
authors.forename: Jiangtao
authors.initials: J
authors.lastname: Wang
authors.forename: Zhenxing
authors.initials: Z
authors.lastname: Zhang
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Pan
authors.forename: Erqing
authors.initials: E
authors.lastname: Xie
mesh_terms: D004396:Coloring Agents / Q000737:chemistry*; D004566:Electrodes; D043942:Nanotubes / Q000737:chemistry*; D011205:Povidone / Q000737:chemistry; D012993:Solar Energy; D017971:Tin Compounds / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D004396:Coloring Agents; D017971:Tin Compounds; C009495:titanium dioxide; C023599:stannous chloride; D014025:Titanium; D011205:Povidone; C045358:stannic oxide