Double-layered TiO₂ cavity/nanoparticle photoelectrodes for efficient dye-sensitized solar cells

Abstract

TiO₂ nanoparticles (NPs) in the size of ~25 nm, namely P25, are very common material as the electron collecting layer in dye-sensitized solar cells (DSSCs). However, the light-scattering improvement of TiO₂ NP photoelectrodes is still a challenge. Here, we built TiO₂ cavities on the top of the TiO₂ NP layer by using carbonaceous microspheres as the template, forming the TiO₂ cavity/nanoparticle (C/NP) photoelectrode for the application in DSSCs. The cavity amount in the TiO₂ C/NP photoelectrode was controlled by adjusting the weight ratio of carbonaceous microspheres. SEM results confirm the successful formation of the double-layered TiO₂ C/NP electrode. J‒V tests show that the optimized TiO₂ C/NP electrode prepared with 25 wt.% carbonaceous microspheres contributes to remarkable improvement of the short-circuit current density (J_sc) and the power conversion efficiency (PCE). The best photovoltaic performance solar cell with the PCE of 9.08% is achieved with the optimized TiO₂ C/NP photoelectrode, which is over 98% higher than that of the TiO₂ NP photoelectrode. Further investigations of UV-vis DRS, IPCE, OCVD, and EIS demonstrate that the competition between light scattering effect and charges recombination in this TiO₂ C/NP photoelectrode is responsible for the PCE enhancement.

Graphical abstract

Keywords

titanium dioxide / dye sensitized solar cell / cavity / light scattering

References

[1] Devadiga D, Selvakumar M, Shetty P, . Recent progress in dye sensitized solar cell materials and photo-supercapacitors: a review.Journal of Power Sources, 2021, 493: 229698

[2] Ahmad M S, Pandey A K, Rahim N A . Advancements in the development of TiO₂ photoanodes and its fabrication methods for dye sensitized solar cell (DSSC) applications: a review.Renewable & Sustainable Energy Reviews, 2017, 77: 89–108

[3] Grätzel M . Photoelectrochemical cells.Nature, 2001, 414(6861): 338–344

[4] Yun S, Vlachopoulos N, Qurashi A, . Dye sensitized photoelectrolysis cells.Chemical Society Reviews, 2019, 48(14): 3705–3722

[5] Muñoz-García A B, Benesperi I, Boschloo G, . Dye-sensitized solar cells strike back.Chemical Society Reviews, 2021, 50(22): 12450–12550

[6] Ismael M . A review and recent advances in solar-to-hydrogen energy conversion based on photocatalytic water splitting over doped-TiO₂ nanoparticles.Solar Energy, 2020, 211: 522–546

[7] Daneshvar S, Saed A E, Sadrnezhaad S K . Hierarchical rutile/anatase TiO₂ nanorod/nanoflower thin film: synthesis and characterizations.Materials Science in Semiconductor Processing, 2019, 93: 252–259

[8] Bu C, Liu Y, Yu Z, . Highly transparent carbon counter electrode prepared via an in situ carbonization method for bifacial dye-sensitized solar cells.ACS Applied Materials & Interfaces, 2013, 5(15): 7432–7438

[9] Wang X, Zhao B, Kan W, . Review on low-cost counter electrode materials for dye-sensitized solar cells: effective strategy to improve photovoltaic performance.Advanced Materials Interfaces, 2022, 9(2): 2101229

[10] Song H, Pan Z, Rao H, . TiO₂ hierarchical nanowire-P25 particulate composite photoanodes in combination with N-doped mesoporous carbon/Ti counter electrodes for high performance quantum dot-sensitized solar cells.Solar Energy, 2019, 191: 459–467

[11] Gao Y, Nie W, Zhu Q, . The polarization effect in surface-plasmon-induced photocatalysis on Au/TiO₂ nanoparticles.Angewandte Chemie International Edition, 2020, 59(41): 18218–18223

[12] Marandi M, Farahani F A, Davoudi M . Fabrication of submicron/micron size cavities included TiO₂ photoelectrodes and optimization of light scattering to improve the photovoltaic performance of CdS quantum dot sensitized solar cells.Journal of Electroanalytical Chemistry, 2017, 799: 167–174

[13] Deepak T G, Anjusree G S, Thomas S, . A review on materials for light scattering in dye-sensitized solar cells.RSC Advances, 2014, 4(34): 17615–17638

[14] Huang F, Chen D, Zhang X L, . Dual-function scattering layer of submicrometer-sized mesoporous TiO₂ beads for high-efficiency dye-sensitized solar cells.Advanced Functional Materials, 2010, 20(8): 1301–1305

[15] Chen D, Huang F, Cheng Y B, . Mesoporous anatase TiO₂ beads with high surface areas and controllable pore sizes: a superior candidate for high-performance dye-sensitized solar cells.Advanced Materials, 2009, 21(21): 2206–2210

[16] Sauvage F, Chen D, Comte P, . Dye-sensitized solar cells employing a single film of mesoporous TiO₂ beads achieve power conversion efficiencies over 10%.ACS Nano, 2010, 4(8): 4420–4425

[17] Guo K, Li M, Fang X, . Improved properties of dye-sensitized solar cells by multifunctional scattering layer of yolk–shell-like TiO₂ microspheres.Journal of Power Sources, 2014, 264: 35–41

[18] Sheng J, Hu L, Li W, . Formation of single-crystalline rutile TiO₂ splitting microspheres for dye-sensitized solar cells.Solar Energy, 2011, 85(11): 2697–2703

[19] Huang Y, Wu H, Yu Q, . A single-layer TiO₂ film composed of mesoporous spheres for high-efficiency and stable dye-sensitized solar cells.ACS Sustainable Chemistry & Engineering, 2018, 6(3): 3411–3418

[20] Sun J, Guo H, Zhao L, . Co-sensitized efficient dye-sensitized solar cells with TiO₂ hollow sphere/nanoparticle double-layer film electrodes by Bi₂S₃ quantum dots and N719.International Journal of Electrochemical Science, 2017, 12: 7941–7955

[21] Hu H, Shen H, Cui C, . Preparation and photoelectrochemical properties of TiO₂ hollow spheres embedded TiO₂/CdS photoanodes for quantum-dot-sensitized solar cells.Journal of Alloys and Compounds, 2013, 560: 1–5

[22] Liu Y, Lan K, Bagabas A A, . Ordered macro/mesoporous TiO₂ hollow microspheres with highly crystalline thin shells for high-efficiency photoconversion.Small, 2016, 12(7): 860–867

[23] Zhu K, Neale N R, Miedaner A, . Enhanced charge-collection efficiencies and light scattering in dye-sensitized solar cells using oriented TiO₂ nanotubes arrays.Nano Letters, 2007, 7(1): 69–74

[24] Lee K S, Kwon J, Im J H, . Size-tunable, fast, and facile synthesis of titanium oxide nanotube powders for dye-sensitized solar cells.ACS Applied Materials & Interfaces, 2012, 4(8): 4164–4168

[25] Rui Y, Li Y, Zhang Q, . Size-tunable TiO₂ nanorod microspheres synthesised via a one-pot solvothermal method and used as the scattering layer for dye-sensitized solar cells.Nanoscale, 2013, 5(24): 12574–12581

[26] Musavi Gharavi P S, Mohammadi M R . The improvement of light scattering of dye-sensitized solar cells aided by a new dandelion-like TiO₂ nanostructures.Solar Energy Materials and Solar Cells, 2015, 137: 113–123

[27] Yang G, Zhang J, Wang P, . Light scattering enhanced photoanodes for dye-sensitized solar cells prepared by carbon spheres/TiO₂ nanoparticle composites.Current Applied Physics, 2011, 11(3): 376–381

[28] Du X, Zhao L, He X, . TiO₂ hierarchical pores/nanorod arrays composite film as photoanode for quantum dot-sensitized solar cells.Journal of Energy Chemistry, 2019, 30: 1–7

[29] Ren H, Yu R, Wang J, . Multishelled TiO₂ hollow microspheres as anodes with superior reversible capacity for lithium ion batteries.Nano Letters, 2014, 14(11): 6679–6684

[30] Grätzel M . Solar energy conversion by dye-sensitized photovoltaic cells.Inorganic Chemistry, 2005, 44(20): 6841–6851

[31] Zhang Q, Chou T P, Russo B, . Polydisperse aggregates of ZnO nanocrystallites: a method for energy-conversion-efficiency enhancement in dye-sensitized solar cells.Advanced Functional Materials, 2008, 18(11): 1654–1660

[32] Huang F, Tang H, Wang Y, . Hierarchical ZnO microspheres photoelectrodes assembled with Zn chalcogenide passivation layer for high efficiency quantum dot sensitized solar cells.Journal of Power Sources, 2018, 401: 255–262

[33] Zhao H, Wu Q, Hou J, . Enhanced light harvesting and electron collection in quantum dot sensitized solar cells by TiO₂ passivation on ZnO nanorod arrays.Science China Materials, 2017, 60(3): 239–250

[34] Dang X, Qi J, Klug M T, . Tunable localized surface plasmon-enabled broadband light-harvesting enhancement for high-efficiency panchromatic dye-sensitized solar cells.Nano Letters, 2013, 13(2): 637–642

[35] Jiang D, Hao Y, Shen R, . Effective blockage of the interfacial recombination process at TiO₂ nanowire array electrodes in dye-sensitized solar cells.ACS Applied Materials & Interfaces, 2013, 5(22): 11906–11912

[36] Mora-Seró I, Giménez S, Fabregat-Santiago F, . Recombination in quantum dot sensitized solar cells.Accounts of Chemical Research, 2009, 42(11): 1848–1857

[37] Song H, Lin Y, Zhang Z, . Improving the efficiency of quantum dot sensitized solar cells beyond 15% via secondary deposition.Journal of the American Chemical Society, 2021, 143(12): 4790–4800

[38] Wang W, Du J, Ren Z, . Improving loading amount and performance of quantum dot-sensitized solar cells through metal salt solutions treatment on photoanode.ACS Applied Materials & Interfaces, 2016, 8(45): 31006–31015

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