Pump–Probe Spectroscopic Study of Charge Carrier Transport Processes in Films of CsPbBr3 Perovskite Colloidal Quantum Dots
摘要
Abstract
Colloidal quantum dots of CsPbBr3 perovskites have been synthesized. The average size and polydispersity of nanocrystals were determined to be 8.3 nm and 16%, respectively. Thin films were made based on the obtained nanocrystals using drop-casting and spin-coating methods. The charge carrier transport process was studied using the technique of femtosecond laser pump–probe spectroscopy. An interpretation of the shift in the bleaching peak as a function of time is proposed. The mobility of charge carriers in films has been estimated using the Einstein–Smoluchowski equation.