Proceedings of Online Meetup: Origins of Electronic Defects in Halide Perovskites (EDHP)
Publication date: 1st April 2020
We report observation of effects of K+-doped (FAPbI3)0.875(CsPbBr3)0.125 perovskite by impedance spectroscopy. The kinetics for generation of the ionic double layer at the vicinity of the contacts is reduced by two orders of magnitude in the time scale when devices are doped with K+ as detected by impedance spectroscopy. A significantly reduced hysteresis in K+-doped perovskite is responsible for more prolonged stability exhibiting ~96% of initial power conversion efficiency (PCE) after 22 days than relatively short-lived perovskite undoped with K+ ion. This work highlights the correlation of kinetics of the double layer close to the contacts with severe hysteresis and long-term instability in PSCs and the importance of K+ ion in reducing the kinetics affecting the ionic attachment to the contact surface.
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