Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Inorganic cesium perovskite has been considered as a potential light harvesting materials as a top cell in multi-junction devices due to their tuneable bandgap and higher thermal stability. CsPbI3 has a more suitable bandgap of 1.73 eV for photovoltaic applications especially for double junction perovskite/Si tandem. However, CsPbI3 does not have a stable perovskite phase at ambient temperature due to the relatively small ionic radius of Cs to hold the PbI6 octahedra together. To overcome the phase instability, the metal in the B site in an ABX3 perovskite can be partly substituted with a smaller ionic radius to stabilise the perovskite phase.
In this work, we utilize calcium (Ca, 1.00 Å) to partially substitute Pb in the CsPbI3 precursor to produce CsPbI3 films. We observe a reduction in the size of the colloids in the precursor solution as a result. These lead to more uniform film formation with larger grain size, which results in better contact between perovskite and hole transporting material (HTM) and an increase in device performance. In addition, the bandgap of the film increases with Ca2+ and the surface of the resultant film has been modified that becomes a calcium rich oxide layer which provides a passivation effect when the amount of Ca2+ is appropriate. Subsequently, we fabricated a mesoporous device with a thick perovskite layer (around 400nm) at the optimal Ca concentration condition (5 mol % Ca2+ in the precursor) producing photovoltaic cells with respectable performance. After applying anti-reflection coating, the champion cell achieves a PCE of 13.5% under reverse scan and a stabilised PCE of 13.3%. With encapsulation, the device maintains 85% of the initial PCE after 2 months of storage in ambient conditions.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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