Enhancing the Microstructure of Perovskite-Inspired Cu-Ag-Bi-I Absorber for Efficient Indoor Photovoltaics

Murthy Grandhi; Basheer Al-Anesi; Hannu Pasanen; Harri Ali-Löytty; Kimmo Lahtonen; Sari Granroth; Nino Christian; Anastasia Matuhina; Maning Liu; Alex Berdin; Vincenzo Pecunia; Paola Vivo

doi:10.1002/smll.202203768

Enhancing the Microstructure of Perovskite-Inspired Cu-Ag-Bi-I Absorber for Efficient Indoor Photovoltaics

Murthy Grandhi, Basheer Al-Anesi, Hannu Pasanen, Harri Ali-Löytty, Kimmo Lahtonen, Sari Granroth, Nino Christian, Anastasia Matuhina, Maning Liu, Alex Berdin, Vincenzo Pecunia, Paola Vivo

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Abstract

Lead-free perovskite-inspired materials (PIMs) are gaining attention in optoelectronics due to their low toxicity and inherent air stability. Their wide bandgaps (≈2 eV) make them ideal for indoor light harvesting. However, the investigation of PIMs for indoor photovoltaics (IPVs) is still in its infancy. Herein, the IPV potential of a quaternary PIM, Cu2AgBiI6 (CABI), is demonstrated upon controlling the film crystallization dynamics via additive engineering. The addition of 1.5 vol% hydroiodic acid (HI) leads to films with improved surface coverage and large crystalline domains. The morphologically-enhanced CABI+HI absorber leads to photovoltaic cells with a power conversion efficiency of 1.3% under 1 sun illumination—the highest efficiency ever reported for CABI cells and of 4.7% under indoor white light-emitting diode lighting—that is, within the same range of commercial IPVs. This work highlights the great potential of CABI for IPVs and paves the way for future performance improvements through effective passivation strategies.

Original language	English
Article number	2203768
Number of pages	8
Journal	Small
Volume	18
Issue number	35
DOIs	https://doi.org/10.1002/smll.202203768
Publication status	Published - 2022
Publication type	A1 Journal article-refereed

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Small - 2022 - Grandhi - Enhancing the Microstructure of Perovskite%u2010Inspired Cu%u2010Ag%u2010Bi%u2010I Absorber for Efficient IndoorFinal published version, 3.26 MBLicence: CC BY-NC

https://urn.fi/URN:NBN:fi:tuni-202208016137Licence: CC BY-NC

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title = "Enhancing the Microstructure of Perovskite-Inspired Cu-Ag-Bi-I Absorber for Efficient Indoor Photovoltaics",

abstract = "Lead-free perovskite-inspired materials (PIMs) are gaining attention in optoelectronics due to their low toxicity and inherent air stability. Their wide bandgaps (≈2 eV) make them ideal for indoor light harvesting. However, the investigation of PIMs for indoor photovoltaics (IPVs) is still in its infancy. Herein, the IPV potential of a quaternary PIM, Cu2AgBiI6 (CABI), is demonstrated upon controlling the film crystallization dynamics via additive engineering. The addition of 1.5 vol% hydroiodic acid (HI) leads to films with improved surface coverage and large crystalline domains. The morphologically-enhanced CABI+HI absorber leads to photovoltaic cells with a power conversion efficiency of 1.3% under 1 sun illumination—the highest efficiency ever reported for CABI cells and of 4.7% under indoor white light-emitting diode lighting—that is, within the same range of commercial IPVs. This work highlights the great potential of CABI for IPVs and paves the way for future performance improvements through effective passivation strategies.",

author = "Murthy Grandhi and Basheer Al-Anesi and Hannu Pasanen and Harri Ali-L{\"o}ytty and Kimmo Lahtonen and Sari Granroth and Nino Christian and Anastasia Matuhina and Maning Liu and Alex Berdin and Vincenzo Pecunia and Paola Vivo",

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doi = "10.1002/smll.202203768",

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AU - Grandhi, Murthy

AU - Al-Anesi, Basheer

AU - Pasanen, Hannu

AU - Ali-Löytty, Harri

AU - Lahtonen, Kimmo

AU - Granroth, Sari

AU - Christian, Nino

AU - Matuhina, Anastasia

AU - Liu, Maning

AU - Berdin, Alex

AU - Pecunia, Vincenzo

AU - Vivo, Paola

PY - 2022

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N2 - Lead-free perovskite-inspired materials (PIMs) are gaining attention in optoelectronics due to their low toxicity and inherent air stability. Their wide bandgaps (≈2 eV) make them ideal for indoor light harvesting. However, the investigation of PIMs for indoor photovoltaics (IPVs) is still in its infancy. Herein, the IPV potential of a quaternary PIM, Cu2AgBiI6 (CABI), is demonstrated upon controlling the film crystallization dynamics via additive engineering. The addition of 1.5 vol% hydroiodic acid (HI) leads to films with improved surface coverage and large crystalline domains. The morphologically-enhanced CABI+HI absorber leads to photovoltaic cells with a power conversion efficiency of 1.3% under 1 sun illumination—the highest efficiency ever reported for CABI cells and of 4.7% under indoor white light-emitting diode lighting—that is, within the same range of commercial IPVs. This work highlights the great potential of CABI for IPVs and paves the way for future performance improvements through effective passivation strategies.

AB - Lead-free perovskite-inspired materials (PIMs) are gaining attention in optoelectronics due to their low toxicity and inherent air stability. Their wide bandgaps (≈2 eV) make them ideal for indoor light harvesting. However, the investigation of PIMs for indoor photovoltaics (IPVs) is still in its infancy. Herein, the IPV potential of a quaternary PIM, Cu2AgBiI6 (CABI), is demonstrated upon controlling the film crystallization dynamics via additive engineering. The addition of 1.5 vol% hydroiodic acid (HI) leads to films with improved surface coverage and large crystalline domains. The morphologically-enhanced CABI+HI absorber leads to photovoltaic cells with a power conversion efficiency of 1.3% under 1 sun illumination—the highest efficiency ever reported for CABI cells and of 4.7% under indoor white light-emitting diode lighting—that is, within the same range of commercial IPVs. This work highlights the great potential of CABI for IPVs and paves the way for future performance improvements through effective passivation strategies.

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M1 - 2203768

ER -

Enhancing the Microstructure of Perovskite-Inspired Cu-Ag-Bi-I Absorber for Efficient Indoor Photovoltaics

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