Rutile TiO2 microspheres with exposed nano-acicular single crystals for dye-sensitized solar cells

AbstractUniquely structured rutile TiO2 microspheres with exposed nano-acicular single crystals have been successfully synthesized via a facile hydrothermal method. After calcination at 450 °C for 2 h, the rutile TiO2 microspheres with a high surface area of 132 m2/g have been utilized as a light harvesting enhancement material for dye-sensitized solar cells (DSSCs). The resultant DSSCs exhibit an overall light conversion efficiency of 8.41% for TiO2 photoanodes made of rutile TiO2 microspheres and anatase TiO2 nanoparticles (mass ratio of 1:1), significantly higher than that of pure anatase TiO2 nanoparticle photoanodes of similar thickness (6.74%). Such a significant improvement in performance can be attributed to the enhanced light harvesting capability and synergetic electron transfer effect. This is because the photoanodes made of rutile TiO2 microsphere possess high refractive index which improves the light utilisation efficiency, suitable microsphere core sizes (450–800 nm) to effectively scatter visible light, high surface area for dye loading, and synergetic electron transfer effects between nanoparticulate anatase and nano-acicular rutile single crystals phases giving high electron collection efficiency.

[1]  Xinjian Feng,et al.  Enhanced harvesting of red photons in nanowire solar cells: evidence of resonance energy transfer. , 2009, ACS nano.

[2]  Tatsuya Okubo,et al.  Densification of nanostructured titania assisted by a phase transformation , 1992, Nature.

[3]  Zhong Tang,et al.  Hydrophilic properties of nano-TiO2 thin films deposited by RF magnetron sputtering , 2007 .

[4]  H. Masjuki,et al.  Effects of annealing treatment on optical properties of anatase TiO2 thin films , 2008 .

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

[6]  Porun Liu,et al.  Anatase TiO(2) microspheres with exposed mirror-like plane {001} facets for high performance dye-sensitized solar cells (DSSCs). , 2010, Chemical communications.

[7]  Eric A. Perpète,et al.  Towards new efficient dye-sensitised solar cells , 2010 .

[8]  Wenming Tong,et al.  Supersaturated spontaneous nucleation to TiO2 microspheres: synthesis and giant dielectric performance. , 2010, Chemical communications.

[9]  H. Pettersson,et al.  Dye-sensitized solar cells. , 2010, Chemical Reviews.

[10]  Michael Grätzel,et al.  A contribution to the optical design of dye-sensitized nanocrystalline solar cells , 1999 .

[11]  Ulrike Diebold,et al.  The surface science of titanium dioxide , 2003 .

[12]  A. J. Frank,et al.  Comparison of Dye-Sensitized Rutile- and Anatase-Based TiO2 Solar Cells , 2000 .

[13]  Yongcai Qiu,et al.  Double-layered photoanodes from variable-size anatase TiO2 nanospindles: a candidate for high-efficiency dye-sensitized solar cells. , 2010, Angewandte Chemie.

[14]  H. Imai,et al.  Growth of submicrometer-scale rectangular parallelepiped rutile TiO2 films in aqueous TiCl3 solutions under hydrothermal conditions. , 2004, Journal of the American Chemical Society.

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

[16]  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 .

[17]  Jiaguo Yu,et al.  Dye-sensitized solar cells based on hollow anatase TiO2 spheres prepared by self-transformation method , 2010 .

[18]  Dongsheng Xu,et al.  Controlling synthesis of well-crystallized mesoporous TiO2 microspheres with ultrahigh surface area for high-performance dye-sensitized solar cells , 2010 .

[19]  Victor S Batista,et al.  Synergistic effect between anatase and rutile TiO2 nanoparticles in dye-sensitized solar cells. , 2009, Dalton transactions.

[20]  Yoon-Ha Jeong,et al.  Light scattering with oxide nanocrystallite aggregates for dye-sensitized solar cell application , 2010 .

[21]  Peng Wang,et al.  Employ a bisthienothiophene linker to construct an organic chromophore for efficient and stable dye-sensitized solar cells , 2009 .

[22]  Bin Liu,et al.  Growth of oriented single-crystalline rutile TiO(2) nanorods on transparent conducting substrates for dye-sensitized solar cells. , 2009, Journal of the American Chemical Society.

[23]  Fuzhi Huang,et al.  Dye-sensitized solar cells employing a single film of mesoporous TiO2 beads achieve power conversion efficiencies over 10%. , 2010, ACS nano.

[24]  Fumin Wang,et al.  Highly efficient dye-sensitized solar cells with a titania thin-film electrode composed of a network structure of single-crystal-like TiO2 nanowires made by the "oriented attachment" mechanism. , 2004, Journal of the American Chemical Society.

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

[26]  Yanhong Luo,et al.  Towards Optimization of Materials for Dye‐Sensitized Solar Cells , 2009 .

[27]  Taeghwan Hyeon,et al.  Nanorod‐Based Dye‐Sensitized Solar Cells with Improved Charge Collection Efficiency , 2008 .

[28]  Fuzhi Huang,et al.  Dual‐Function Scattering Layer of Submicrometer‐Sized Mesoporous TiO2 Beads for High‐Efficiency Dye‐Sensitized Solar Cells , 2010 .

[29]  Zuowei Xie,et al.  Nickel-catalyzed regioselective [2+2+2] cycloaddition of carboryne with alkynes. , 2010, Angewandte Chemie.

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

[31]  Michael Grätzel,et al.  Solar energy conversion by dye-sensitized photovoltaic cells. , 2005, Inorganic chemistry.

[32]  Michael Graetzel,et al.  A low-cost, high-efficiency solar cell based on dye-sensitized colloidal titanium dioxide films , 1991 .

[33]  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.

[34]  Juan Bisquert,et al.  Determination of the electron lifetime in nanocrystalline dye solar cells by open-circuit voltage decay measurements. , 2003, Chemphyschem : a European journal of chemical physics and physical chemistry.

[35]  Ashraful Islam,et al.  Conversion efficiency of 10.8% by a dye-sensitized solar cell using a TiO2 electrode with high haze , 2006 .

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

[37]  N. Park,et al.  Size-dependent scattering efficiency in dye-sensitized solar cell , 2008 .