Journal
NANO ENERGY
Volume 58, Issue -, Pages 825-833Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2019.02.009
Keywords
Spontaneous polymerization; Grain boundary; Defects passivation; Stability; Perovskite solar cells
Categories
Funding
- National Natural Science Foundation of China [51773213, 61474125]
- Natural Science Foundation of Zhejiang Province of China [LQ19E030008]
- China Postdoctoral Science Foundation [2017M610380]
- Key Research Program of Frontier Sciences, CAS [QYZDB-SSW-JSC047]
- K.C. Wong Education Foundation [rczx0800]
- Zhejiang Province Science and Technology Plan [2018C01047]
- National Youth Topnotch Talent Support Program
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Spontaneous grain polymerization strategy is proposed to fabricate efficient and stable perovskite solar cells (PSCs) through the incorporation of polymerizable additive ethyl 2-cyanoacrylate (E2CA). E2CA lies in and chemically anchors to grain boundaries (GBs) owing to -CN and -C=O groups' coordination with PbI2, thus passivating the defects at GBs and leading to high devices efficiency of 21.03%. Importantly, E2CA in perovskite films will spontaneously polymerize to a hydrophobic polymer at GBs when exposed in moisture air, thus blocking GBs channel for moisture penetration and enhancing the moisture-resisting properties of perovskite films. As a result, PSCs with E2CA exhibit superior stability in moisture air (relative humidity: 40-60%), retaining similar to 90% of the maximum efficiency after aging over 1000 h. Even under high temperature (85 degrees C) in moisture air, non-encapsulated MAPbI(3)-E2CA devices still show good stability despite the burn-in degradation, retaining over 90% of the post burn-in efficiency after aging 200 h.
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