Abstract
There has been an increasing interest in renewable energy issue and perovskite type solar cell because of the following advantages of perovskite solar cell: high absorption coefficient, flexibility, low cost, and the rapid growth of efficiency that has been improved from 3.8% up to 20% in only six years (2009-2014). However, there are still lack of the direct evidences for the synthesis and growth of CH3NH3PbI3 peovskite nanocrystals in TEM. Hence, in order to help fill this gap in our knowledge, this study investigated the synthesis and growth of CH3NH3PbI3 peovskite nanocrystals by in situ liquid TEM. In this study, we show the new design of spacer in wet cell chip, which creates a larger flow channel to improve flowing system, and in situ observation for PbI2 nanocrystals growing by in situ liquid TEM. Furthermore, according to LSW theory, the growth of PbI2 is approaching to reaction limit mechanism. Finally, we demonstrate in situ observation for synthesis and growth of CH3NH3PbI3 perovskite nanocrystals, and also discuss the possible mechanism.