Proceedings of nanoGe International Conference on Perovskite Solar Cells, Photonics and Optoelectronics (NIPHO19)
DOI: https://doi.org/10.29363/nanoge.nipho.2019.017
Publication date: 21st November 2018
Two-dimensional (2D) perovskite possess interesting optical and physical properties in addition to the enhanced stability of solar cells which contain 2D perovskite. In our work1 we used bromide-based perovskite and varied their dimensionality in the range between a pure 2D structure of (PEA)2(MA)n–1PbnBr3n+1 to three dimensional (3D) MAPbBr3 structure. Optical and physical characterizations were used to characterize the perovskite film, and full perovskite solar cells. Quasi 2D perovskite (having 40-50 layers of perovskite) enabled the increment in the photovoltaic performance (PV). In addition , we studied different barrier molecules demonstrating the significant effect of the barrier molecules on the 2D and quasi 2D perovskites.2
The introduction of different barrier molecules in the quasi 2D perovskite affected the photovoltaic properties of the solar cells, which results with high open circuit voltage (Voc) of more than 1.4 V with PCE of 9.5% for full bromide-based PSCs. Further manipulation of the barrier molecule enabled us to fabricate low dimensional highly efficient iodide-based PSCs.
These low dimensional PSCs having n=10, yielded power conversion efficiency of 15.6%, with a current density of 21.5mA/cm2. The high PV performance and current density of the low dimensional perovskite were achieved solely by changing the barrier molecule, without any modified deposition methods or additives. Furthermore, photo-electronic characterizations showed different mechanism of the low dimensional PSCs. This work demonstrates the ability to tune the perovskite properties using chemical modifications. The simplicity of the chemical modifications opens the way to simple delicate adjustments, thanks to the wide range of available materials, through combining perovskites of several dimensionalities.
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