Electron Blocking Behavior of Electrochemically deposited TiO2 Compact layers for meso- and planar-perovskite Solar Cells
Keywords:
Electrochemical Deposition, TiO2 Compact layer. Chronopotintiometry,, Titanium(III)chloride & Blocking behavior.Abstract
The TiO2 layers were electrochemically deposited under galvanostatic mode using three different deposition times. They were intended to be used as compact layers in perovskite solar cells. The structural and optical properties and surface morphology of electrochemically deposited TiO2 compact layers (TiO2 ED-CLs) were studied by X-ray diffraction, scanning electron microscopy and UV-vis absorption spectroscopy. The present work mainly examined the quality and electron blocking behavior of TiO2 ED-CLs developed under different deposition times and modified electrolytes (TiCl3/K2CO3 and TiCl3/Na2CO3) by cyclic voltammetry. This electrochemical study indicated that the ED-CL deposited at 800s offered an optimum blocking behavior and the TiO2-CLs formed from TiCL3/K2CO3 is apparently less dense giving lower blocking effect compared to TiO2-CLs deposited from TiCL3/Na2CO3 system.
References
[2] A. Hagfeldt, G. Boschloo, L. Sun, L. Kloo, H. Pettersson, Dye-sensitised solar cells, J. Chem. Rev. 110 (2010) 6595 – 6663.
[3] L.Yang, Hole Transport Materials for Solid-State Mesoscopic Solar Cells, PhD, Uppsala University, Upsala, 2014.
[4] X. Chen, S.S. Mao., Titanium Dioxide Nanomaterials: Synthesis, Properties, Modifications, and Applications, J. Chem. Rev.107 (2012), 2891 – 2951.
[5] L. Kavan, N. Tetreault, T. Moehl, M. Grätzel, Electrochemical Characterization of TiO2 Blocking Layers for Dye- Sensitized Solar Cells, J. Phys. Chem. 118 (2014) 6408 – 1641.
[6] L. Kavan, M. Grätzel, Highly efficient semiconducting TiO2 photoelectrodes prepared by aerosol pyrolysis, Electrochim. Acata. 40 (1995) 643 – 652.
[7] T.S. Su, T.Y. Hsieh, C.Y. Hong, T.C. Wei, Electrodeposited Ultrathin TiO2 Blocking Layers for Efficient Perovskite Solar Cells, Scientific Report. (2015)16098.
[8] L.kavan, B.O’Regan, M. Grätzel, Preparation of TiO, (anatase) films on electrodes by anodic oxidative hydrolysis of TiCl3, J. Electroanal. Chem. 346 (1993) 291 – 307.
[9] T.S. Su, T.Y. Hsieh, C.Y. Hong, T.C. Wei, Electrodeposited TiO2 Film with Mossy Nanostructure for Efficient Compact Layer in Scaffold-Type Perovskite Solar Cell, Adv. Sci. News. (2018) 1700120.
[10] S.H. Aung, L. Zhao, K. Nonomura, T.Z. Oo, S.M. Zakeeruddin, N. Vlachopoulos, T. Sloboda,
S. Svanström, U.B. Cappel, A. Hagfeldt, M. Grätzel, Toward an Alternative Approach for Preparation of Low-Temperature Titanium Dioxide Blocking Underlayer for Perovskite Solar Cells, J. Mater. Chem. A. 7 (2019) 10729 – 10738.
[11] A. Manivannan, N. Spataru, K. Arihara, A. Fujishima. Electrochemical Deposition of Titanium Oxide on Boron-Doped Diamond Electrodes, Electrochem. Solid-State Lett. (2005)138 – 140.
[12] S.Y. Lin, T.Z. Su, T.Y. Hsieh, P.C. Lo, T.C. Wei, Efficient Plastic Perovskite Solar Cell with a Low-Temperature Processable Electrodeposited TiO2 Compact Layer and Brookite TiO2 Scaffold, Adv. Energy Mater. 7 (2017) 1700169.
[13] B. Endrdi, E. Kecsenovity, K. Rajeshwar, C. Janaky, One-step Electrodeposition of Nanocrystalline TiO2 Films with Enhanced Photoelectrochemical Performance and Charge Storage, ACS Appl. Energy Mater. (2018) 851 – 858.
