Size and temperature dependence of photoluminescence of hybrid perovskite nanocrystals

• DOI: 10.1063/1.5124025
• Publication Date: 2019-10-21T15:22:02Z
• Authors: Sara Bonabi Naghadeh; Som Sarang; Amanda Brewer; A’Lester Allen; Yi-Hsuan Chiu; Yung-Jung Hsu; Jhen-Yang Wu; Sayantani Ghosh; Jin Z. Zhang
• Keywords: 02 engineering and technology; 0210 nano-technology; 01 natural sciences; 0104 chemical sciences

In this work, we studied the effects of particles' size and temperature on photoluminescence (PL) CH3NH3PbBr3 perovskite nanocrystals (PNCs), with PNC controlled by varying surface passivating ligands. The structural optical properties PNCs were investigated using UV-Vis PL spectroscopy, revealing strong quantum confinement effects. Temperature dependent measurements showed spectral blue shift peak for small (3.1 ± 0.2 nm) decreasing from 300 K to 20 K, which is opposite red observed large- (9.2 0.5 middle-sized (5.1 0.3 PNCs. lifetime also increased increasing larger PNCs, while it remained about same This increase in attributed exciton dissociation free carriers at higher temperatures formation polar domains However, did not show such a trend, may be due efficient defect passivation as concentration 3-aminopropyl trimethoxysilane (APTMS) was used role particle state delocalization. Cryo-X-ray diffraction no new or splitting varied, suggests crystal phase stabilization all three sizes APTMS. These results emphasize importance their yield, lifetime, stability.