Modelling nanocrystal growth via the precipitation method

Kinetic analysis of the growth behavior of perovskite CsPbBr3 nanocrystals in a microfluidic system

“…Increasing the capillary length and decreasing the total flow rate can increase the growth time of CsPbBr 3 NCs. To evaluate the effects of the capillary length between the miniaturized reactor and the large glass vial on the PL characteristics and the size evolution of CsPbBr 3 NCs, we prepared CsPbBr 3 NCs from the same microfluidic system with different capillary lengths (20,40,60 and 80 cm) between the miniaturized reactor and the large glass vial for a total flow rate of 1.05 mL min −1 at 303 K. Fig. S3 and S4 † present the PL spectra and XRD patterns of the CsPbBr 3 NCs prepared with four different capillary lengths.…”

“…, the growth of the CsPbBr 3 NCs in the microfluidic platform is dependent on the synthesis temperature and the growth time (flow rate). For a diffusion-dominant growth process, the time dependence of the characteristic size of a semiconductor NC can be expressed as 59,60 a 2 = Dt with D being the diffusion coefficient of monomers in the liquid solution, and t being the growth time. The temperature dependence of the diffusion coefficient follows the Arrhenius relation as D = D 0 e − Q / RT where D 0 is a pre-factor, Q is the activation energy for the diffusion of the monomers in the liquid solution, and R is the gas constant.…”