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Enhancing Charge Transfer in Perovskite-Inspired Silver Iodobismuthate-Based Solar Cells via Cesium Iodide Interlayer

Al-Anesi, Basheer ; Sugathan, Vipinraj LU orcid ; Karlsson, Joshua K. G. ; Tewari, Amit ; Nasare, Roshan ; Mäkinen, Paavo ; Manna, Debjit ; Mäntysalo, Matti and Vivo, Paola (2024) In Advanced Energy and Sustainability Research 5(10).
Abstract

Ag3BiI6 (ABI) is one of the most widely explored lead-free perovskite-inspired materials for eco-friendly solar cell applications. However, despite the intense research efforts, the photovoltaic performance of ABI-based devices remains very modest, primarily due to poor film morphology and ineffective charge extraction. This work aims at investigating the potential benefits of a thermally evaporated cesium iodide (CsI) interlayer on the performance of ABI-based solar cells. Upon the addition of CsI atop the ABI layer in the device stack, the solar cells deliver a power conversion efficiency (PCE) of 2.27%. This is the highest efficiency reported for ABI solar cells employing a similar device architecture. It is... (More)

Ag3BiI6 (ABI) is one of the most widely explored lead-free perovskite-inspired materials for eco-friendly solar cell applications. However, despite the intense research efforts, the photovoltaic performance of ABI-based devices remains very modest, primarily due to poor film morphology and ineffective charge extraction. This work aims at investigating the potential benefits of a thermally evaporated cesium iodide (CsI) interlayer on the performance of ABI-based solar cells. Upon the addition of CsI atop the ABI layer in the device stack, the solar cells deliver a power conversion efficiency (PCE) of 2.27%. This is the highest efficiency reported for ABI solar cells employing a similar device architecture. It is found that the enhancement in PCE is largely due to improvement in the ABI|hole transport layer interface upon the introduction of CsI interlayer. The improvement is largely ascribed to enhanced surface coverage upon introduction of CsI interlayer, as evidenced by our comprehensive microscopy studies. Furthermore, impedance spectroscopy analysis is employed to provide further insights into the changes in charge transfer dynamics interlayer that dictate the enhancement of fill factor and short-circuit current density in the devices. The findings indicate that the addition of CsI promotes charge transfer and minimizes recombination losses.

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Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
keywords
charge-transfer, CsI, perovskite-inspired materials, silver iodobismuthates, solar cells
in
Advanced Energy and Sustainability Research
volume
5
issue
10
article number
2400119
external identifiers
  • scopus:85198425423
ISSN
2699-9412
DOI
10.1002/aesr.202400119
language
English
LU publication?
no
additional info
Publisher Copyright: © 2024 The Author(s). Advanced Energy and Sustainability Research published by Wiley-VCH GmbH.
id
e6d8759e-e1a3-4875-a6ff-8bffa9c923c5
date added to LUP
2026-09-22 09:36:25
date last changed
2026-09-25 12:28:28
@article{e6d8759e-e1a3-4875-a6ff-8bffa9c923c5,
  abstract     = {{<p>Ag<sub>3</sub>BiI<sub>6</sub> (ABI) is one of the most widely explored lead-free perovskite-inspired materials for eco-friendly solar cell applications. However, despite the intense research efforts, the photovoltaic performance of ABI-based devices remains very modest, primarily due to poor film morphology and ineffective charge extraction. This work aims at investigating the potential benefits of a thermally evaporated cesium iodide (CsI) interlayer on the performance of ABI-based solar cells. Upon the addition of CsI atop the ABI layer in the device stack, the solar cells deliver a power conversion efficiency (PCE) of 2.27%. This is the highest efficiency reported for ABI solar cells employing a similar device architecture. It is found that the enhancement in PCE is largely due to improvement in the ABI|hole transport layer interface upon the introduction of CsI interlayer. The improvement is largely ascribed to enhanced surface coverage upon introduction of CsI interlayer, as evidenced by our comprehensive microscopy studies. Furthermore, impedance spectroscopy analysis is employed to provide further insights into the changes in charge transfer dynamics interlayer that dictate the enhancement of fill factor and short-circuit current density in the devices. The findings indicate that the addition of CsI promotes charge transfer and minimizes recombination losses.</p>}},
  author       = {{Al-Anesi, Basheer and Sugathan, Vipinraj and Karlsson, Joshua K. G. and Tewari, Amit and Nasare, Roshan and Mäkinen, Paavo and Manna, Debjit and Mäntysalo, Matti and Vivo, Paola}},
  issn         = {{2699-9412}},
  keywords     = {{charge-transfer; CsI; perovskite-inspired materials; silver iodobismuthates; solar cells}},
  language     = {{eng}},
  number       = {{10}},
  series       = {{Advanced Energy and Sustainability Research}},
  title        = {{Enhancing Charge Transfer in Perovskite-Inspired Silver Iodobismuthate-Based Solar Cells via Cesium Iodide Interlayer}},
  url          = {{http://dx.doi.org/10.1002/aesr.202400119}},
  doi          = {{10.1002/aesr.202400119}},
  volume       = {{5}},
  year         = {{2024}},
}