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Frontiers of Optoelectronics

Front. Optoelectron.    2019, Vol. 12 Issue (4) : 344-351
Screen printing process control for coating high throughput titanium dioxide films toward printable mesoscopic perovskite solar cells
Zhining WAN, Mi XU, Zhengyang FU, Da LI, Anyi MEI, Yue HU, Yaoguang RONG(), Hongwei HAN
Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan 430074, China
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Screen printing technique has been widely applied for the manufacturing of both traditional silicon solar cells and emerging photovoltaics such as dye-sensitized solar cells (DSSCs) and perovskite solar cells (PSCs). Particularly, we have developed a printable mesoscopic PSC based on a triple layer scaffold of TiO2/ZrO2/carbon. The deposition of the scaffold is entirely based on screen printing process, which provides a promising prospect for low-cost photovoltaics. However, the optimal thickness of the TiO2 layer for fabricating efficient printable PSCs is much smaller than the typical thickness of screen printed films. Here, we tune the concentration of the pastes and the printing parameters for coating TiO2 films, and successfully print TiO2 films with the thickness of 500−550 nm. The correlation between the thickness of the films and printing parameters such as the solid content and viscosity of the pastes, the printing speed and pressure, and the temperature has been investigated. Besides, the edge effect that the edge of the TiO2 films possesses a much larger thickness and printing positional accuracy have been studied. This work will significantly benefit the further development of printable mesoscopic PSCs.

Keywords screen printing      perovskite solar cells (PSCs)      thickness      parameter control     
Corresponding Authors: Yaoguang RONG   
Just Accepted Date: 07 March 2019   Online First Date: 29 April 2019    Issue Date: 30 December 2019
 Cite this article:   
Zhining WAN,Mi XU,Zhengyang FU, et al. Screen printing process control for coating high throughput titanium dioxide films toward printable mesoscopic perovskite solar cells[J]. Front. Optoelectron., 2019, 12(4): 344-351.
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Zhining WAN
Zhengyang FU
Anyi MEI
Yue HU
Yaoguang RONG
Hongwei HAN
Fig.1  (a) Scheme of the fabrication process of printable mesoscopic PSCs; (b) structure of the printable mesoscopic PSC submodules with series-connections; (c) cross-sectional SEM image of the screen printed scaffold
Fig.2  (a) Thickness variations of the screen printed TiO2 layer with different paste/terpineol mass ratio; (b) statistical distributions of the thickness
Fig.3  (a) Dependence of viscosity of the TiO2 paste on paste/terpineol mass ratio; (b) dependence of viscosity of the TiO2 paste on temperature; (c) dependence of the TiO2 layer thickness on the viscosity; (d) dependence of the TiO2 layer thickness on the solid content
Fig.4  (a) Dependence of the film thickness on print speed; (b) dependence of the film thickness on print gap; (c) dependence of the film thickness on print pressure
Fig.5  (a) Positional accuracy for printing the TiO2 films; (b) microscopy image of the edge of printed TiO2 films on FTO substrate; (c) length accuracy for printing the TiO2 films; (d) edge effect of the printed TiO2 films
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