Dual‐Function Scattering Layer of Submicrometer‐Sized Mesoporous TiO2 Beads for High‐Efficiency Dye‐Sensitized Solar Cells

Submicrometer-sized (830 ± 40 nm) mesoporous TiO 2 beads are used to form a scattering layer on top of a transparent, 6-μm-thick, nanocrystalline TiO 2 film. According to the Mie theory, the large beads scatter light in the region of 600-800 nm. In addition, the mesoporous structure offers a high surface area, 89.1 m 2 g -1 , which allows high dye loading. The dual functions of light scattering and electrode participation make the mesoporous TiO 2 beads superior candidates for the scattering layer in dye-sensitized solar cells. A high efficiency of 8.84% was achieved with the mesoporous beads as a scattering layer, compared with an efficiency of 7.87% for the electrode with the scattering layer of 400-nm TiO 2 of similar thickness.

[1]  Nam-Gyu Park,et al.  Formation of Highly Efficient Dye‐Sensitized Solar Cells by Hierarchical Pore Generation with Nanoporous TiO2 Spheres , 2009 .

[2]  Yangxuan Xiao,et al.  TiO2‐Coated Multilayered SnO2 Hollow Microspheres for Dye‐Sensitized Solar Cells , 2009 .

[3]  Jing Zhang,et al.  Improvement in dye-sensitized solar cells with a ZnO-coated TiO2 electrode by rf magnetron sputtering , 2008 .

[4]  B. Li,et al.  TiO2 surface modification and characterization with nanosized PbS in dye-sensitized solar cells. , 2006, The journal of physical chemistry. B.

[5]  Guozhong Cao,et al.  Polydisperse Aggregates of ZnO Nanocrystallites: A Method for Energy‐Conversion‐Efficiency Enhancement in Dye‐Sensitized Solar Cells , 2008 .

[6]  R. Vittal,et al.  TiO2 nanorods as additive to TiO2 film for improvement in the performance of dye-sensitized solar cells , 2006 .

[7]  Pingjian Li,et al.  An all-solid-state dye-sensitized solar cell-based poly(N-alkyl-4-vinyl-pyridine iodide) electrolyte with efficiency of 5.64%. , 2008, Journal of the American Chemical Society.

[8]  Prashant V. Kamat,et al.  Quantum Dot Solar Cells. Semiconductor Nanocrystals as Light Harvesters , 2008 .

[9]  C. Tropea,et al.  Light Scattering from Small Particles , 2003 .

[10]  C. Grimes,et al.  Vertically aligned single crystal TiO2 nanowire arrays grown directly on transparent conducting oxide coated glass: synthesis details and applications. , 2008, Nano letters.

[11]  Guozhong Cao,et al.  Hierarchically Structured ZnO Film for Dye‐Sensitized Solar Cells with Enhanced Energy Conversion Efficiency , 2007 .

[12]  Kai Zhu,et al.  Nanocrystalline TiO2 solar cells sensitized with InAs quantum dots. , 2006, The journal of physical chemistry. B.

[13]  M. Grätzel,et al.  A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films , 1991, Nature.

[14]  Sarmimala Hore,et al.  Scattering spherical voids in nanocrystalline TiO2- enhancement of efficiency in dye-sensitized solar cells. , 2005, Chemical communications.

[15]  H. Smit,et al.  Influence of scattering layers on efficiency of dye-sensitized solar cells , 2006 .

[16]  Vaidyanathan Subramanian,et al.  Quantum dot solar cells. harvesting light energy with CdSe nanocrystals molecularly linked to mesoscopic TiO2 films. , 2006, Journal of the American Chemical Society.

[17]  Guozhong Cao,et al.  Aggregation of ZnO nanocrystallites for high conversion efficiency in dye-sensitized solar cells. , 2008, Angewandte Chemie.

[18]  Fuzhi Huang,et al.  Mesoporous Anatase TiO2 Beads with High Surface Areas and Controllable Pore Sizes: A Superior Candidate for High‐Performance Dye‐Sensitized Solar Cells , 2009 .

[19]  Hironori Arakawa,et al.  Significant influence of TiO2 photoelectrode morphology on the energy conversion efficiency of N719 dye-sensitized solar cell , 2004 .

[20]  Joachim Luther,et al.  Computer simulations of light scattering and absorption in dye-sensitized solar cells , 1998 .