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Crown Ether Modulation Enables over 23% Efficient Formamidinium-Based Perovskite Solar Cells.

Authors :
Su TS
Eickemeyer FT
Hope MA
Jahanbakhshi F
Mladenović M
Li J
Zhou Z
Mishra A
Yum JH
Ren D
Krishna A
Ouellette O
Wei TC
Zhou H
Huang HH
Mensi MD
Sivula K
Zakeeruddin SM
Milić JV
Hagfeldt A
Rothlisberger U
Emsley L
Zhang H
Grätzel M
Source :
Journal of the American Chemical Society [J Am Chem Soc] 2020 Nov 25; Vol. 142 (47), pp. 19980-19991. Date of Electronic Publication: 2020 Nov 10.
Publication Year :
2020

Abstract

The use of molecular modulators to reduce the defect density at the surface and grain boundaries of perovskite materials has been demonstrated to be an effective approach to enhance the photovoltaic performance and device stability of perovskite solar cells. Herein, we employ crown ethers to modulate perovskite films, affording passivation of undercoordinated surface defects. This interaction has been elucidated by solid-state nuclear magnetic resonance and density functional theory calculations. The crown ether hosts induce the formation of host-guest complexes on the surface of the perovskite films, which reduces the concentration of surface electronic defects and suppresses nonradiative recombination by 40%, while minimizing moisture permeation. As a result, we achieved substantially improved photovoltaic performance with power conversion efficiencies exceeding 23%, accompanied by enhanced stability under ambient and operational conditions. This work opens a new avenue to improve the performance and stability of perovskite-based optoelectronic devices through supramolecular chemistry.

Details

Language :
English
ISSN :
1520-5126
Volume :
142
Issue :
47
Database :
MEDLINE
Journal :
Journal of the American Chemical Society
Publication Type :
Academic Journal
Accession number :
33170007
Full Text :
https://doi.org/10.1021/jacs.0c08592