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  4. N-Type Conductive Small Molecule Assisted 23.5% Efficient Inverted Perovskite Solar Cells
 
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research article

N-Type Conductive Small Molecule Assisted 23.5% Efficient Inverted Perovskite Solar Cells

Cao, Qi
•
Li, Yuke
•
Zhang, Yixin
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July 27, 2022
Advanced Energy Materials

Because of the compatibility with tandem devices and the ability to be manufactured at low temperatures, inverted perovskite solar cells have generated far-ranging interest for potential commercial applications. However, their efficiency remains inadequate owing to various traps in the perovskite film and the restricted hole blocking ability of the electron transport layer. Thus, in this work, a wide-bandgap n-type semiconductor, 4,6-bis(3,5-di(pyridin-4-yl)phenyl)-2-phenylpyrimidine (B4PyPPM), to modify a perovskite film via an anti-solvent method is introduced. The nitrogen sites of pyrimidine and pyridine rings in B4PyPPM exhibit strong interactions with the undercoordinated lead ions in the perovskite material. These interactions can reduce the trap state densities and inhibit nonradiative recombination of the perovskite bulk. Moreover, B4PyPPM can partially aggregate on the perovskite surface, leading to an improvement in the hole-blocking ability at its interface. This modification can also increase the built-in potential and upshift the Fermi level of the modified perovskite film, promoting electron extraction to the electron transport layer. The champion device achieves a high efficiency of 23.51%. Meantime, the sealed device retains approximate to 80% of its initial performance under a maximum power point tracking for nearly 2400 h, demonstrating an excellent operational stability.

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Type
research article
DOI
10.1002/aenm.202201435
Web of Science ID

WOS:000831038400001

Author(s)
Cao, Qi
•
Li, Yuke
•
Zhang, Yixin
•
Zhao, Junsong
•
Wang, Tong
•
Yang, Bowen  
•
Pu, Xingyu
•
Yang, Jiabao
•
Chen, Hui
•
Chen, Xingyuan
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Date Issued

2022-07-27

Publisher

WILEY-V C H VERLAG GMBH

Published in
Advanced Energy Materials
Article Number

2201435

Subjects

Chemistry, Physical

•

Energy & Fuels

•

Materials Science, Multidisciplinary

•

Physics, Applied

•

Physics, Condensed Matter

•

Chemistry

•

Materials Science

•

Physics

•

antisolvent engineering

•

conductive small molecules

•

high efficiency

•

inverted pscs

•

operational stability

•

highly efficient

•

lead

•

performance

•

modulation

•

interfaces

•

cation

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LSPM  
Available on Infoscience
August 15, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/190092
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