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research article

Anomalous Electroluminescence Characteristics of Perovskite Modules

Wu, Haodong
•
Zhang, Junchuan
•
Zhang, Yi
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August 14, 2024
ACS Applied Materials & Interfaces

Spatially resolved photoluminescence (PL) and electroluminescence (EL) imaging technologies play a crucial role in evaluating the performance and stability of photovoltaic devices. However, their application in perovskite devices presents unique challenges. In this study, we report a discrepancy between the electrical performance of perovskite solar modules (PSMs) and the EL images. Following the application of a reverse bias voltage, we observed an increase in EL brightness associated with prolonged carrier lifetime and transport length. Furthermore, cross-sectional Kelvin probe force microscopy identified a significant potential increase primarily at the electron-transport layer (ETL) side after reverse bias, suggesting the presence of defective ETL/perovskite interfaces with filled hole traps. To address this EL mismatch, we proposed a mild reverse current recovery method aimed at aligning EL images with the cell performance without compromising device efficiency. This approach effectively mitigates discrepancies, ensuring alignment between the device performance and EL imaging. Our study underscores that caution is required when utilizing EL imaging to monitor spatial homogeneity in PSMs for future industrial production.

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Type
research article
DOI
10.1021/acsami.4c03397
Scopus ID

2-s2.0-85200375347

PubMed ID

39093718

Author(s)
Wu, Haodong
•
Zhang, Junchuan
•
Zhang, Yi
•
Cao, Fangfang
•
Qiu, Zhiheng
•
Zhang, Liping
•
Asiri, Abdullah M.
•
Dyson, Paul J.  
•
Nazeeruddin, Mohammad Khaja  
•
Ye, Jichun
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Date Issued

2024-08-14

Published in
ACS Applied Materials & Interfaces
Volume

16

Issue

32

Start page

41986

End page

41995

Subjects

electroluminescence

•

interfacial recombination

•

KPFM

•

perovskite solar modules

•

reverse bias

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LCOM  
FunderFunding(s)Grant NumberGrant URL

Ningbo Institute of Materials Technology and Engineering

Deputyship for Research & Innovation

Chinese Academy of Sciences

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Available on Infoscience
January 24, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/243492
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