Abstract
CdSe/CdS semiconductor quantum dots co-sensitized TiO2 nanorod array was fabricated on the transparent conductive fluorine-doped tin oxide (FTO) substrate using the hydrothermal and successive ionic layer adsorption and reaction (SILAR) process. The structural and morphological properties of the samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). The results indicate that CdSe/CdS QDs are uniformly coated on the surface of the TiO2 nanorods. The shift of light absorption edge was monitored by taking UV-visible absorption spectra. Compared with the absorption spectra of the TiO2 nanorod array, deposition of CdSe/CdS QDs shifts the absorption edge to the higher wavelength. The enhanced light absorption in the visible-light region of CdSe/CdS/TiO2 nanorod array indicates that CdSe/CdS layers can act as co-sensitizers in quantum dots sensitized solar cells (QDSSCs). By optimizing the CdSe layer deposition cycles, a photocurrent of 5.78 mA/cm2, an open circuit photovoltage of 0.469 V and a conversion efficiency of 1.34 % were obtained under an illumination of 100 mw/cm2.
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O’Regan B, Grätzel M. A Low-cost, High-efficiency Solar Cell Based on Dye-sensitized Colloidal TiO2 Films [J]. Nature, 1991, 353(6 346): 737–740
Peter L M, Riley D j, Tull E J, et al. Photosensitization of Nanocrystalline TiO2 by Self-assembled Layers of CdS Quantum Dots[J]. Chem. Commun., 2002, 10: 1 030–1 031
Robel I, Subramanian V, Kuno M, et al. Quantum Dot Solar Cells. Harvesting Light Energy with CdSe Nanocrystals Molecularly Linked to Mesoscopic TiO2 Films[J]. J. Am. Chem. Soc., 2006, 128(7): 2 385–2 393
Plass R, Serge P, Krüger J, et al. Quantum Dot Sensitization of Organic-Inorganic Hybrid Solar Cells [J]. J. Phys. Chem. B, 2002, 106(31): 7 578–7 580
Blackburn J L, Selmarten D C, Ellingson R J, et al. Electron and Hole Transfer from Indium Phosphide Quantum Dots [J]. J. Phys. Chem. B, 2005, 109(7): 2 625–2 631
Kongkanand A, Tvrdy K, Takechi K, et al. Quantum Dot Solar Cells. Tuning Photoresponse through Size and Shape Control of CdSe-TiO2 Architecture [J]. J. Am. Chem. Soc., 2008, 130(12): 4 007–4 015
Nozik A J. Excition Multiplication and Relaxation Dynamics in Quantum Dots: Applications to Ultrahigh-Efficiency Solar Photon Conversion [J]. Inorg. Chem., 2005, 44(20): 6 893–6 899
Hanna M C, Nozic A J. Solar Conversion Efficiency of Photovoltaic and Photoelectrolysis Cells with Carrier Multiplication Absorbers[J]. J. Appl. Phys., 2006, 100(7): 074 510
Tian Z R, Voigt J A, Liu J, et al. Large Oriented Arrays and Continuous Films of TiO2-Based Nanotubes[J]. J. Am. Chem. Soc., 2003, 125(41): 12 384–12 385
Liu B, Aydil E S. Growth of Oriented Single-Crystalline Rutile TiO2 Nanorods on Transparent Conducting Substrates for Dye-Sensitized Solar Cells [J]. J. Am. Chem. Soc., 2009, 131(11): 3 985–3 990
Feng X J, Shankar K, Varghese O K, et al. Vertically Aligned Single Crystal TiO2 Nanowire Arrays Grown Directly on Transparent Conducting Oxide Coated Glass: Synthesis Details and Applications [J]. Nano Lett., 2008, 8(11): 3 781–3 786
Sun W T, Yu Y, Pan H Y, et al. CdS Quantum Dots Sensitized TiO2 Nanotube-Array Photoelectrodes[J]. J. Am. Chem. Soc., 2008, 130(4): 1 124–1 125
Lee W J, Kang S H, Min S K, et al. Co-sensitization of Vertically Aligned TiO2 Nanotubes with Two Different Sizes of CdSe Quantum Dots for Broad Spectrum[J]. Electrochem. Commun., 2008, 10(10): 1 579–1 582
Chen H, Fu W Y, Yang H B, et al. Photosensitization of TiO2 Nanorods with CdS Quantum Dots for Photovoltaic Devices[J]. Electrochimica Acta, 2010, 56(2): 919–924
Grätzel M. Photoelectrochemical Cells[J]. Nature, 2001, 414(6 861): 338–344
Wang H, Bai Y S, Zhang H, et al. CdS Quantum Dots-Sensitized TiO2 Nanorod Array on Transparent Conductive Glass Photoelectrodes[J]. J. Phys. Chem. C, 2010, 114(39): 16 451–16 455
Lee H J, Wang M K, Chen P, et al. Efficient CdSe Quantum Dot-Sensitized Solar Cells Prepared by an Improved Successive Ionic Layer Adsorption and Reaction Process[J]. Nano Lett., 2009, 9(12): 4 421–4 424
Lee Y L, Lo Y S. Highly Efficient Quantum-Dot-Sensitized Solar Cell Based on Co-Sensitization of CdS/CdSe[J]. Adv. Func. Mater., 2009, 19(4): 604–609
Seol M S, Kim H J, Tak Y J, et al. Novel Nanowire Array Based Highly Efficient Quantum Dot Sensitized Solar Cell [J]. Chem. Commun., 2010, 46(30): 5 521–5 523
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Funded by National Natural Science Foundation of China (No.11174071), the International Cooperation Project of Wuhan City and Hubei Province (Nos. 201070934339 and 2010BFA010)
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Wang, J., Zhang, T., Wang, Q. et al. Composite semiconductor quantum dots CdSe/CdS Co-sensitized TiO2 nanorod array solar cells. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 27, 876–880 (2012). https://doi.org/10.1007/s11595-012-0566-4
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DOI: https://doi.org/10.1007/s11595-012-0566-4