posted on 2024-01-10, 18:33authored byYihui Zou, Liang Han, Changhong Lin, Haihua Hu, Peng Wang, Ping Lin, Lingbo Xu, Xiaoping Wu, Can Cui
Interface modification has emerged
as a highly effective
strategy
for achieving the synergistic optimization of surface defects of SnO2, film quality of perovskite, and their interfacial energy
level matching, thereby contributing to the photovoltaic performance
and long-term stability of perovskite solar cells (PSCs). Herein,
we introduced SbCl3 into the SnO2/MAPbI3 interface. This approach capitalizes on the difference in
electronegativity and the similarity in ionic radii between Sn and
Sb, inducing an interaction between Sn and O atoms on the SnO2 surface with Sb from SbCl3. The interaction results
in an excellent SnO2/MAPbI3 interface with fewer
defects and better energy level alignment. Moreover, high-quality
perovskite films with fewer bulk defects were achieved due to the
beneficial effects of Cl– anions that passivate
uncoordinated Pb2+ defects and promote MAPbI3 crystallization. As a result, MAPbI3 PSCs with SbCl3 modification prepared in a full open-air environment demonstrated
a PCE of 20.69% along with enhanced stability. This research highlights
the substantial potential of incorporating SbCl3 into the
SnO2/perovskite interface as a promising approach for enhancing
both the efficiency and stability of planar PSCs.