posted on 2022-02-23, 17:05authored byMirella Al Katrib, Emilie Planes, Lara Perrin
In
this work, electrodeposition was explored as an alternative
technique for elaborating large-scale and homogeneous perovskite layers
for photovoltaic application. This method was used to elaborate simple
MAPbI3 and mixed halide perovskites MAPbI3–xClx. PbO2 was
first electrodeposited in a controlled manner. Next, the conversion
into perovskite was conducted with various iodine/chlorine ratios.
This produced different compositions of perovskites combining an interesting
range of microstructural and functional properties. These perovskites,
obtained for the first time using electrodeposition, were then tested
in solar cell devices. The performances obtained with these innovative
electrodeposited mixed perovskites are excellent, better than those
obtained with most of the common forms of MAPbI3 published
so far. In addition, the stability of these electrodeposited perovskites
has been evaluated under mild aging conditions (40 °C, under
vacuum or an ambient atmosphere) for 500 h. For the treatment under
vacuum, a maturation process was evidenced inducing an improvement
of PCE close to 40%, to reach 7%. These results are of great interest,
especially considering the active area tested close to 0.2 cm2. The addition of Cl in the lattice not only limits the formation
of by-products (PbI2, MAPbCl3, etc.) and enhances
the efficiency of the solar cells but also largely increases the stability.