Improved Morphology and Efficiency of n–i–p
Planar Perovskite Solar Cells by Processing with Glycol Ether Additives
Esma Ugur
Arif D. Sheikh
Rahim Munir
Jafar I. Khan
Dounya Barrit
Aram Amassian
Frédéric Laquai
10.1021/acsenergylett.7b00526.s001
https://acs.figshare.com/articles/journal_contribution/Improved_Morphology_and_Efficiency_of_n_i_p_Planar_Perovskite_Solar_Cells_by_Processing_with_Glycol_Ether_Additives/5286031
Planar
perovskite solar cells can be prepared without high-temperature
processing steps typically associated with mesoporous device architectures;
however, their efficiency has been lower, and producing high-quality
perovskite films in planar devices has been challenging. Here, we
report a modified two-step interdiffusion protocol suitable to preparing
pinhole-free perovskite films with greatly improved morphology. This
is achieved by simple addition of small amounts of glycol ethers to
the preparation protocol. We unravel the impact the glycol ethers
have on the perovskite film formation using in situ ultraviolet–visible
absorbance and grazing incidence wide-angle X-ray scattering experiments.
From these experiments we conclude that addition of glycol ethers
changes the lead iodide to perovskite conversion dynamics and enhances
the conversion efficiency, resulting in more compact polycrystalline
films, and it creates micrometer-sized perovskite crystals vertically
aligned across the photoactive layer. Consequently, the average photovoltaic
performance increases from 13.5% to 15.9%, and reproduciability is
enhanced, specifically when 2-methoxyethanol is used as the additive.
2017-07-31 00:00:00
micrometer-sized perovskite crystals
mesoporous device architectures
incidence wide-angle X-ray
photovoltaic performance increases
glycol ethers
Glycol Ether Additives Planar perovskite
perovskite film formation
pinhole-free perovskite films
glycol ethers changes
perovskite conversion dynamics