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CH3NH3Cl-Assisted One-Step Solution Growth of CH3NH3PbI3: Structure, Charge-Carrier Dynamics, and Photovoltaic Properties of Perovskite Solar Cells
journal contribution
posted on 2014-05-08, 00:00 authored by Yixin Zhao, Kai ZhuWe
demonstrate a novel one-step solution approach to prepare perovskite
CH3NH3PbI3 films by adding CH3NH3Cl (or MACl) to the standard CH3NH3PbI3 precursor (equimolar mixture of CH3NH3I and PbI2) solution. The use of MACl strongly
affects the crystallization process of forming pure CH3NH3PbI3, leading not only to enhanced absorption
of CH3NH3PbI3 but also to significantly
improved coverage of CH3NH3PbI3 on
a planar substrate. Compared to the standard one-step solution approach
for CH3NH3PbI3, using MACl improves
the performance of CH3NH3PbI3 solar
cells from about 2% to 12% for the planar cell structure and from
about 8% to 10% for the mesostructured device architecture. Although
we find no significant effect of using MACl on charge transport and
recombination in mesostructured perovskite cells, the recombination
resistance for planar cells increases by 1–2 orders of magnitude
by using MACl. These results suggest that this new one-step solution
approach is promising for controlling CH3NH3PbI3 growth to achieve high-performance perovskite solar
cells.