Charge Carrier Trapping at Surface Defects of Perovskite
Solar Cell Absorbers: A First-Principles Study
Hiroki Uratani
Koichi Yamashita
10.1021/acs.jpclett.7b00055.s001
https://acs.figshare.com/articles/journal_contribution/Charge_Carrier_Trapping_at_Surface_Defects_of_Perovskite_Solar_Cell_Absorbers_A_First-Principles_Study/4633231
The
trapping of charge carriers at defects on surfaces or grain
boundaries is detrimental for the performance of perovskite solar
cells (PSCs). For example, it is the main limiting factor for carrier
lifetime. Moreover, it causes hysteresis in the current–voltage
curves, which is considered to be a serious issue for PSCs’
operation. In this work, types of surface defects responsible for
carrier trapping are clarified by a comprehensive first-principles
investigation into surface defects of tetragonal CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> (MAPbI<sub>3</sub>). Considering defect formation
energetics, it is proposed that a Pb-rich condition is preferred to
an I-rich one; however, a moderate condition might possibly be the
best choice. Our result paves the way for improving the performance
of PSCs through a rational strategy of suppressing carrier trapping
at surface defects.
2017-01-27 00:00:00
charge Carrier Trapping
defect formation energetics
performance
surface defects
CH 3 NH 3 PbI 3
PSC
Perovskite Solar Cell Absorbers
carrier