Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
DOI: https://doi.org/10.29363/nanoge.hopv.2022.148
Publication date: 20th April 2022
Template-assisted synthesis of optically active CsPbI3 quantum dots [1]
Cesium Lead Iodide perovskite (CsPbI3) is the most suitable fully inorganic perovskite for light emitting and harvesting applications due to its band gap around 1.77 eV which is the closest to the ideal value of 1.34 eV for a single-junction solar cell. However, these optoelectronic properties only concern for the “black” optically active phase (α) which is only stable at temperatures above 310ºC, degrading to the β and γ active phases and eventually to the “yellow” non-optically active orthorhombic phase (δ) which is the thermodynamically most stable phase at room temperature.
Here, we present a scaffold assisted synthesis of CsPbI3 quantum dots (QDs) in the “black” optically active phase directly in a film. By using a porous network made of stacked SiO2 nanospheres, we create a mesoporous scaffold with a 50% porosity which allows a further infiltration of a CsPbI3 precursor solution. After a thermal treatment at only 100ºC, we obtain CsPbI3 QDs thanks to the strain conferred by the matrix during crystal growth without the need of any ligands nor additives. Nanocrystals optical properties can be tuned by means of quantum confinement effects either varying the precursor solution concentration but also as a consequence of Iodine/Lead ratio (I-/Pb2+) alteration. Additionally, the control in the filling of the matrix enables an efficient charge transport between QDs by charge percolation mechanism envised through impedance spectroscopy analysis [2]. This allows us to develop solar cells along and deep-red light emitting diodes (LED).
Financial support of the Spanish Ministry of Science and Innovation under grant PID2020-116593RB-I00, funded by MCIN/AEI/10.13039/501100011033, and of the Junta de Andalucía under grant P18-RT-2291 (FEDER/UE) is gratefully acknowledged.
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