The Effects of Ionic Liquids on Tin Perovskite Solar Cells

Oving, Jelle (2019) The Effects of Ionic Liquids on Tin Perovskite Solar Cells. Bachelor's Thesis, Applied Physics.

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Abstract

Tin perovskite solar cells are excellent candidates for advanced solar cells given the high absorption coefficient, diffusion length and carrier mobility. However the fast oxidation of tin inside the perovskite together with large quantity of trap states lead to greatly reduced efficiencies for the solar cell. Elimination of the grain boundaries by growing compact tin perovskite films with large grains is one promising strategy to overcome these issues. Several research groups have focused on the addition of ionic liquid (IL) to improve morphology and environmental sensitivity, reporting bigger grains and better stability. All the literature found focuses on improving lead perovskites. Within this study there is IL added to the precursor solution for a tin hybrid perovskite solar cell. There were trials with multiple -imidizolium based IL’s (see section 4.1), showing similar behaviour within the fabricated device. Increase in the short circuit current is observed, likely due to reduced surface roughness or bigger grains. A negative effect was a decrease in open circuit voltage for higher concentrations of IL, where the ionic liquid EMIMOTF showed less of this effect than the other trialed IL’s. This effect can be attributed to more pinholes formed in the material with increasing IL. Although the results were hard to quantify there do seem to be positive effects from adding certain types of IL, be it that for significant improvement the concentration and fabrication needs to b

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Shao, S.
Degree programme:	Applied Physics
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	06 Jan 2020 13:52
Last Modified:	06 Jan 2020 13:52
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/21358

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