Fabrication of high quality perovskite films by modulating the Pb–O bonds in Lewis acid–base adducts

High efficiency perovskite solar cells can be made through the Lewis adduct approach. The interaction between PbI2 and the Lewis base is a key factor to make high quality perovskite films. Here, we combine a two-step method with the Lewis adduct approach to fabricate high quality organometallic pero...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2017, Vol.5 (18), p.8416-8422
Main Authors: Cao, X B, Li, CL, Zhi, L L, Li, Y H, Cui, X, Yao, Y W, Ci, L J, Wei, J Q
Format: Article
Language:English
Subjects:
Adducts
Bonding strength
Lead (metal)
Lewis base
Perovskites
Photovoltaic cells
Solar cells
Strength
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Summary:High efficiency perovskite solar cells can be made through the Lewis adduct approach. The interaction between PbI2 and the Lewis base is a key factor to make high quality perovskite films. Here, we combine a two-step method with the Lewis adduct approach to fabricate high quality organometallic perovskite films by tuning the strength of the Pb-O bond in Lewis acid-base adducts via adding different Lewis base additives. By optimizing the strength of the Pb-O bond, smooth CH3NH3PbI3 films with large perovskite grains are prepared. The high quality CH3NH3PbI3 films lead to a low recombination rate, long carrier life time and highly efficient charge transfer process. As a result, the power conversion efficiency of the best perovskite solar cell increases from 12.79% to 17.26%.
ISSN:2050-7488
2050-7496
DOI:10.1039/c7ta00539c