Fast two-step deposition of perovskite via mediator extraction treatment for large-area, high-performance perovskite solar cells

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As the efficiency of perovskite solar cells (PSCs) reached more than 22%, the large-area fabrication of PSCs became another issue receiving growing attention. For large-area PSCs, more reproducibility is required to precisely control the crystallization behavior of perovskites. A two-step process has been preferred to apply large-area coatings of perovskite because of its better reproducibility, but the process has suffered from slow and incomplete conversion of PbI2 to perovskite. In this paper, we propose a fast, simple, two-step methodmediator extraction treatment (MET)for the preparation of a high-quality perovskite film. In MET, a pre-deposited PbI2-DMSO complex film is converted into a peculiar PbI2 film with a porous morphology and unusual crystallographic orientation via the removal of DMSO. PbI2 could be completely converted into MAPbI(3) by a fast reaction with MAI molecules. We demonstrate that this MET process in MAPbI(3)-based PSCs can achieve 18.8% of the maximum power conversion efficiency (PCE) using spin-coating, and 18.3% of the maximum PCE using slot-die coating with a uniform distribution in a 10 x10 cm(2) substrate at a laboratory scale. Moreover, over 18% of PCE could be achieved in only 100 s, and with room-temperature processing.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2018-07
Language
English
Article Type
Article
Citation

JOURNAL OF MATERIALS CHEMISTRY A, v.6, no.26, pp.12447 - 12454

ISSN
2050-7488
DOI
10.1039/c8ta02868k
URI
http://hdl.handle.net/10203/282745
Appears in Collection
CBE-Journal Papers(저널논문)
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