Enhanced charge-collection efficiencies and light scattering in dye-sensitized solar cells using oriented TiO2 nanotubes arrays

被引:1975
作者
Zhu, Kai [1 ]
Neale, Nathan R. [1 ]
Miedaner, Alexander [1 ]
Frank, Arthur J. [1 ]
机构
[1] Natl Renewable Energy Lab, Golden, CO 80401 USA
关键词
D O I
10.1021/nl062000o
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We report on the microstructure and dynamics of electron transport and recombination in dye-sensitized solar cells (DSSCs) incorporating oriented TiO2 nanotube (NT) arrays. The morphology of the NT arrays, which were prepared from electrochemically anodized Ti foils, were characterized by scanning and transmission electron microscopies. The arrays were found to consist of closely packed NTs, several micrometers in length, with typical wall thicknesses and intertube spacings of 8-10 nm and pore diameters of about 30 nm. The calcined material was fully crystalline with individual NTs consisting of about 30 nm sized crystallites. The transport and recombination properties of the NT and nanoparticle (NP) films used in DSSCs were studied by frequency-resolved modulated photocurrent/photovoltage spectroscopies. While both morphologies display comparable transport times, recombination was much slower in the NT films, indicating that the NT-based DSSCs have significantly higher charge-collection efficiencies than their NP-based counterparts. Dye molecules were shown to cover both the interior and exterior walls of the NTs. Analysis of photocurrent measurements indicates that the light-harvesting efficiencies of NT-based DSSCs were higher than those found for DSSCs incorporating NPs owing to stronger internal light-scattering effects.
引用
收藏
页码:69 / 74
页数:6
相关论文
共 38 条
  • [1] Formation of titania nanotubes and applications for dye-sensitized solar cells
    Adachi, M
    Murata, Y
    Okada, I
    Yoshikawa, S
    [J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2003, 150 (08) : G488 - G493
  • [2] Benkstein KD, 2003, J PHYS CHEM B, V107, P7759, DOI 10.1021/jp0226811
  • [3] Self-organized porous titanium oxide prepared in H2SO4/HF electrolytes
    Beranek, R
    Hildebrand, H
    Schmuki, P
    [J]. ELECTROCHEMICAL AND SOLID STATE LETTERS, 2003, 6 (03) : B12 - B14
  • [4] The effect of electrolyte composition on the fabrication of self-organized titanium oxide nanotube arrays by anodic oxidation
    Cai, QY
    Paulose, M
    Varghese, OK
    Grimes, CA
    [J]. JOURNAL OF MATERIALS RESEARCH, 2005, 20 (01) : 230 - 236
  • [5] Electron transport in porous nanocrystalline TiO2 photoelectrochemical cells
    Cao, F
    Oskam, G
    Meyer, GJ
    Searson, PC
    [J]. JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (42) : 17021 - 17027
  • [6] Surfactant-directed synthesis of mesoporous titania with nanocrystalline anatase walls and remarkable thermal stability
    Cassiers, K
    Linssen, T
    Mathieu, M
    Bai, YQ
    Zhu, HY
    Cool, P
    Vansant, EF
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2004, 108 (12) : 3713 - 3721
  • [7] Chen Q, 2002, ADV MATER, V14, P1208, DOI 10.1002/1521-4095(20020903)14:17<1208::AID-ADMA1208>3.0.CO
  • [8] 2-0
  • [9] Trap-limited electronic transport in assemblies of nanometer-size TiO2 particles
    de Jongh, PE
    Vanmaekelbergh, D
    [J]. PHYSICAL REVIEW LETTERS, 1996, 77 (16) : 3427 - 3430
  • [10] Dynamic response of dye-sensitized nanocrystalline solar cells: Characterization by intensity-modulated photocurrent spectroscopy
    Dloczik, L
    Ileperuma, O
    Lauermann, I
    Peter, LM
    Ponomarev, EA
    Redmond, G
    Shaw, NJ
    Uhlendorf, I
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 1997, 101 (49): : 10281 - 10289