Efficient Carrier Separation and Intriguing Switching of Bound Charges in Inorganic-Organic Lead Halide Solar Cells.
We fabricated a mesoporous perovskite solar cell with a ∼14% conversion efficiency, and we investigated its beneficial grain boundary properties of the perovskite solar cells through the use of scanning probe microscopy. The CH3NH3Pb(I0.88,Br0.12)3 showed a significant potential barrier bending at the grain boundary and induced passivation. The potential difference value in the x = 0.00 sample is ∼50 mV, and the distribution of the positive potential is lower than that of the x = 0.12 sample. We also investigated the polarization and hysteretic properties of the perovskite thin films by measuring the local piezoresponse. Specifically, the charged grain boundaries play a beneficial role in electron-hole depairing and in suppressing recombination in order to realize high-efficiency perovskite solar cells.
†Department of Physics, Ewha Womans University, Seoul 120-750, South Korea.
Gee Yeong
GY
Kim
†Department of Physics, Ewha Womans University, Seoul 120-750, South Korea.
Seol Hee
SH
Oh
†Department of Physics, Ewha Womans University, Seoul 120-750, South Korea.
Bich Phuong
BP
Nguyen
†Department of Physics, Ewha Womans University, Seoul 120-750, South Korea.
William
W
Jo
Byeong Jo
BJ
Kim
Dong Geon
DG
Lee
Hyun Suk
HS
Jung
grain boundary properties; hysteretic properties; mesoporous perovskite solar cell; polarization; scanning probe microscopy