Enhancing Stability and Photostability of CsPbI3 by Reducing Its Dimensionality
Adva Shpatz Dayan a
a The Hebrew University of Jerusalem, The Institute of Chemistry, Casali Center of Applied Chemistry, Edmond J. Safra Campus Givat Ram, Jerusalem, Israel
nanoGe Perovskite Conferences
Proceedings of nanoGe International Conference on Perovskite Solar Cells, Photonics and Optoelectronics (NIPHO19)
International Conference on Perovskite Thin Film Photovoltaics
Jerusalem, Israel, 2019 February 24th - 27th
Organizers: Lioz Etgar and Kai Zhu
Oral, Adva Shpatz Dayan, presentation 005
DOI: https://doi.org/10.29363/nanoge.nipho.2019.005
Publication date: 21st November 2018

Abstract to NIPHO9

It was reported that the use of inorganic cations affects the long-term stability of perovskite solar cells (PSCs), which remains a major impediment for its industrial application1. As a result, there have been several attempts to replace the organic cations with inorganic elements to improve the cells’ stability 23 .CsPbI3 is considered one of the most promising candidates to achieve a stable perovskite structure.

The perovskite’s dimensionality is determined by using a barrier molecule between the inorganic perovskite framework. The barrier molecule is too big to fit into the cage formed by the perovskite octahedrons and therefore, it creates confined inorganic perovskite layers. This low-dimensional perovskite creates a quantum-well structure, where the inorganic framework and the long organic molecules act as wells and barriers, respectively.

Unlike the three dimensional (3D) perovskite, the low-dimensional perovskite has shown promising stability, but it has a much lower power conversion efficiency. The relatively low efficiency of two-dimensional (2D) perovskite solar cells (PSCs) is mainly due to the barrier molecules, which could inhibit charge transport through the film. However, it is likely that combining the high efficiency of 3D perovskite with the enhanced stability of 2D perovskite could be an elegant way to achieve specific requirements from a photovoltaic solar cell4.

 

In this work we demonstrated how the black phase of CsPbI3 can be stabilized when its dimensionality is reduced. Low-dimensional CsPbI3 perovskites were fabricated using two different barrier molecules: linear and aromatic barrier molecules. XRD and SEM show the degradation process of these films, where the low-dimensional perovskite, using an aromatic barrier molecule, displays better stability than does the low-dimensional perovskite, using a linear barrier molecule. Both barrier molecules display enhanced photostability under continuous 1 sun illumination compared with 3D CsPbI3 film, which degrades rapidly. However, the aromatic barrier molecule displays superior photostability compared with the linear barrier. Theoretical calculations explain this observation by the point and extended defects, which increase the time for degradation. Here, we have shown the potential of stabilizing the black phase of CsPbI3, which provides the possibility to use it efficiently and stably in PV solar cells.

 

 

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