am6b06682_si_001.pdf (570.04 kB)
Ambient Engineering for High-Performance Organic–Inorganic Perovskite Hybrid Solar Cells
journal contribution
posted on 2016-08-04, 00:00 authored by Jiabin Huang, Xuegong Yu, Jiangsheng Xie, Dikai Xu, Zeguo Tang, Can Cui, Deren YangConsidering the evaporation of solvents
during fabrication of perovskite films, the organic ambience will
present a significant influence on the morphologies and properties
of perovskite films. To clarify this issue, various ambiences of N,N-dimethylformamide (DMF), dimethyl sulfoxide
(DMSO), and chlorobenzene (CBZ) are introduced during fabrication
of perovskite films by two-step sequential deposition method. The
results reveal that an ambient CBZ atmosphere is favorable to control
the nucleation and growth of CH3NH3PbI3 grains while the others present a negative effect. The statistical
results show that the average efficiencies of perovskite solar cells
processed in an ambient CBZ atmosphere can be significantly improved
by a relatively average value of 35%, compared with those processed
under air. The efficiency of the best perovskite solar cells can be
improved from 10.65% to 14.55% by introducing this ambience engineering
technology. The CH3NH3PbI3 film with
large-size grains produced in an ambient CBZ atmosphere can effectively
reduce the density of grain boundaries, and then the recombination
centers for photoinduced carriers. Therefore, a higher short-circuit
current density is achieved, which makes main contribution to the
improvement in efficiency. These results provide vital progress toward
understanding the role of ambience in the realization of highly efficient
perovskite solar cells.