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research article

Supramolecular interactions using β-cyclodextrin in controlling perovskite solar cell performance

Ferdowsi, Parnian  
•
Kim, Sun-Ju
•
Nguyen, Thanh-Danh
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May 23, 2024
Journal Of Materials Chemistry A

In the context of perovskite solar cells (PSCs), enhancing device performance often involves adding a small excess of lead iodide (PbI2) to the precursor solution. However, the presence of unreacted PbI2 can lead to accelerated degradation compromising long-term stability. This study addresses this issue through supramolecular complex engineering by introducing beta-cyclodextrin (beta-CD) into a triple cation perovskite to effectively prevent the crystallization of residual PbI2. This approach results in uniform crystal growth and the passivation of undercoordinated lead cation defects. The use of beta-CD leads to a PSC with an improved power conversion efficiency (PCE) of 21.36%, surpassing the control, and enhanced stability against aggressive thermal stress and high humidity (85% RH). This is supported by optical and morphological investigations, underscoring the role of beta-CD to maintain the desired perovskite phase. Notably, in comparison to the beta-CD-free control, the beta-CD-treated sample exhibited minimal bandgap shifts of 3 meV after 1170 hours of moisture exposure. Furthermore, this method not only passivates unreacted PbI2 but also provides valuable insights into the role of beta-CD in hybrid perovskite solar cells. Additional tests with maltose as a non-cyclic control were conducted and confirm the superior ability of beta-CD to enhance perovskite film stability under harsh conditions. The formation of a supramolecular system between beta-CD and perovskite holds promise as a strategy to control perovskite precursor chemistry, material structure, and subsequent device performance and stability.|By incorporating beta-cyclodextrin, mitigation of residual PbI2 crystallization, control of perovskite chemistry, and uniform crystal growth, leading to improved solar cell performance and stability were demonstrated.

  • Details
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Type
research article
DOI
10.1039/d4ta01741b
Web of Science ID

WOS:001232933200001

Author(s)
Ferdowsi, Parnian  
Kim, Sun-Ju
Nguyen, Thanh-Danh
Seo, Ji-Youn
Yum, Jun-Ho  
Sivula, Kevin  
Date Issued

2024-05-23

Publisher

Royal Soc Chemistry

Published in
Journal Of Materials Chemistry A
Subjects

Physical Sciences

•

Technology

•

Efficiency

•

Pbi2

•

Passivation

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Modulation

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Chemistry

•

State

•

Films

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LIMNO  
FunderGrant Number

EPFL

Korea Electric Power Corporation (KEPCO)

Available on Infoscience
June 19, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/208656
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