Dr. Ma. del Socorro Aguilar Profile

Dr. Ma. del Socorro Aguilar

at Univ Michoacana de San Nicolás de Hidalgo

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Proceedings Article | 1 October 2023 Poster + Paper

Effect of reaction temperature on CsPbBr3 perovskite quantum dots with photovoltaic applications

H. O. Ramirez-Ferreira, M. S. Aguilar, I. Zarazúa, H. Desirena, A. Herrera-Rodríguez, T. López-Luke

Proceedings Volume 12660, 126600A (2023) https://doi.org/10.1117/12.2676826

KEYWORDS: Cesium, Crystals, Photovoltaics, Perovskite, Solar cells, Lead, Scanning electron microscopy, Quantum dots, Optical properties, Temperature metrology

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Solar energy has been relevant in recent years as a renewable source. On one side, halide perovskites have played an essential role as semiconductors with photovoltaic applications. This work studied the effect of reaction temperature on the synthesis of CsPbBr₃ perovskite quantum dots (PQDs) by the hot injection method. In this case, CsPbBr₃ PQDs are very stable compared to other halide perovskites. The XRD analysis indicated three crystalline phases were obtained: cubic of CsPbBr₃, orthorhombic, and rhombohedral of Cs₄PbBr₆. At a temperature of 130 °C, the cubic phase predominates at 57%. When the temperature increases to 155 and 180 °C, the cubic phase is obtained to a lesser extent, with 33% and 10%, respectively, and the orthorhombic and rhombohedral phases increase. SEM reveals that particle size increased from 8 to 36 nm due to the reaction temperature. The UV-vis results showed that the absorption spectra had a redshift of the visible spectrum from an absorption band from 487 to 514 and 522 nm. Likewise, the PL spectra demonstrate a peak of 501 to 517 and 515 nm as a function of temperature increase, where the calculated Full Width at Half Maximum (FWHM) indicates the purity of the color emitted. Tauc plots of the CsPbBr₃ PQDs showed band gap energies between 1.64 to 2.37 eV, which means these PQDs are interesting in photovoltaics. On the other hand, solar cells were fabricated using CsPbBr₃ PQDs, with the following architecture: FTO/c-TiO2/m-TiO2/PQDs/spiro-OMeTAD/Ag. The photovoltaic parameters were determined, obtaining with J_sc (4.10·10^-6 mA·cm^-2), Voc (0.434 V), FF (30.56%), and PCE (5·10^-4 %). In conclusion, the obtained PVs indicated the charge transport within the solar device in ambient conditions.

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