Enhanced stability of FAPbI3 perovskite quantum dots by silica coating
Paper ID : 1274-ICNS
Mahdi Hasanzadeh Azar *1, Maryam Mohammadi1, Nima Tabatabaei Rezaei1, Samaneh Aynehband1, Abdolreza Simchi2
1Department of Material science and engineering, Sharif University of Technology, Tehran, PO Box: 11365-9466, Iran
2Department of Materials Science and Engineering, Sharif University of Technology, Tehran, 14588, Iran
Ligand-assisted reprecipitation (LARP) method with 3-Aminopropyl triethoxysilane (APTES) ligand was employed to prepare core/shell formamidinium lead iodide (FAPbI3)/SiO2 quantum dots (QDs) in room temperature. The successful synthesis of spherical core/shell QDs with an average size of nm is demonstrated by field emission secondary electron microscopy (FESEM). X-ray diffraction (XRD) pattern proved that pure alpha phase QDs were formed. The obvious 1125 cm-1 peak in fourier-transform infrared spectroscopy (FTIR) confirmed that hydrolysis of silane occured in ambient condition. Photoluminescence and UV-visible implies that absorption, emission wavelength and full-width at half-maximum (FWHM) of QDs appeared in 682, 718 and 68 nm, respectively. Thermogravimetric analysis shows that the silica coated QDs are thermaly stable up to 228 . High intensity emission is attained for more than 6 months after silica coating. The core/shell QDs can be utilized for the fabrication of flexible and stretchable perovskite quantum dot light emitting diodes (QLEDs) and lasers.
Core/shell quantum dot; Hydrolysis, Photoluminescence; Photovoltaic; Renewable energy; Stability
Status : Abstract Accepted (Poster Presentation)