Photocurrent Spectroscopy of Perovskite Layers and Solar Cells: A Sensitive Probe of Material Degradation

Jakub Holovský; Stefaan De Wolf; Jérémie Werner; Zdeněk Remeš; Martin Müller; Neda Neykova; Martin Ledinský; Ladislava Černá; Pavel Hrzina; Philipp Löper; Bjoern Niesen; Christophe Ballif

doi:10.1021/acs.jpclett.6b02854

Photocurrent Spectroscopy of Perovskite Layers and Solar Cells: A Sensitive Probe of Material Degradation

Jakub Holovský, Stefaan De Wolf, Jérémie Werner, Zdeněk Remeš, Martin Müller, Neda Neykova, Martin Ledinský, Ladislava Černá, Pavel Hrzina, Philipp Löper, Bjoern Niesen, Christophe Ballif

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20 Scopus citations

Abstract

Optical absorptance spectroscopy of polycrystalline CHNHPbI films usually indicates the presence of a PbI phase, either as a preparation residue or due to film degradation, but gives no insight on how this may affect electrical properties. Here, we apply photocurrent spectroscopy to both perovskite solar cells and coplanar-contacted layers at various stages of degradation. In both cases, we find that the presence of a PbI phase restricts charge-carrier transport, suggesting that PbI encapsulates CHNHPbI grains. We also find that PbI injects holes into the CHNHPbI grains, increasing the apparent photosensitivity of PbI. This phenomenon, known as modulation doping, is absent in the photocurrent spectra of solar cells, where holes and electrons have to be collected in pairs. This interpretation provides insights into the photogeneration and carrier transport in dual-phase perovskites.

Original language	English (US)
Pages (from-to)	838-843
Number of pages	6
Journal	The Journal of Physical Chemistry Letters
Volume	8
Issue number	4
DOIs	https://doi.org/10.1021/acs.jpclett.6b02854
State	Published - Feb 6 2017

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors acknowledge financial support from Czech Science Foundation Project No. 17-26041Y, the Project KONNECT- 007 of the Czech Academy of Sciences, the Czech Ministry of Education, Youth and Sports Projects LM2015087 and CZ.02.1.01/0.0/0.0/15_003/0000464 Centre of Advanced Photovoltaics, and the Swiss National Science Foundation through Nanotera and PNR 70 program. We thank Prof. Roman Grill and Dr. Thomas Dittrich for fruitful discussions.

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10.1021/acs.jpclett.6b02854

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Holovský, J., De Wolf, S., Werner, J., Remeš, Z., Müller, M., Neykova, N., Ledinský, M., Černá, L., Hrzina, P., Löper, P., Niesen, B., & Ballif, C. (2017). Photocurrent Spectroscopy of Perovskite Layers and Solar Cells: A Sensitive Probe of Material Degradation. The Journal of Physical Chemistry Letters, 8(4), 838-843. https://doi.org/10.1021/acs.jpclett.6b02854

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title = "Photocurrent Spectroscopy of Perovskite Layers and Solar Cells: A Sensitive Probe of Material Degradation",

abstract = "Optical absorptance spectroscopy of polycrystalline CHNHPbI films usually indicates the presence of a PbI phase, either as a preparation residue or due to film degradation, but gives no insight on how this may affect electrical properties. Here, we apply photocurrent spectroscopy to both perovskite solar cells and coplanar-contacted layers at various stages of degradation. In both cases, we find that the presence of a PbI phase restricts charge-carrier transport, suggesting that PbI encapsulates CHNHPbI grains. We also find that PbI injects holes into the CHNHPbI grains, increasing the apparent photosensitivity of PbI. This phenomenon, known as modulation doping, is absent in the photocurrent spectra of solar cells, where holes and electrons have to be collected in pairs. This interpretation provides insights into the photogeneration and carrier transport in dual-phase perovskites.",

author = "Jakub Holovsk{\'y} and {De Wolf}, Stefaan and J{\'e}r{\'e}mie Werner and Zden{\v e}k Reme{\v s} and Martin M{\"u}ller and Neda Neykova and Martin Ledinsk{\'y} and Ladislava {\v C}ern{\'a} and Pavel Hrzina and Philipp L{\"o}per and Bjoern Niesen and Christophe Ballif",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: The authors acknowledge financial support from Czech Science Foundation Project No. 17-26041Y, the Project KONNECT- 007 of the Czech Academy of Sciences, the Czech Ministry of Education, Youth and Sports Projects LM2015087 and CZ.02.1.01/0.0/0.0/15_003/0000464 Centre of Advanced Photovoltaics, and the Swiss National Science Foundation through Nanotera and PNR 70 program. We thank Prof. Roman Grill and Dr. Thomas Dittrich for fruitful discussions.",

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doi = "10.1021/acs.jpclett.6b02854",

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Holovský, J, De Wolf, S, Werner, J, Remeš, Z, Müller, M, Neykova, N, Ledinský, M, Černá, L, Hrzina, P, Löper, P, Niesen, B & Ballif, C 2017, 'Photocurrent Spectroscopy of Perovskite Layers and Solar Cells: A Sensitive Probe of Material Degradation', The Journal of Physical Chemistry Letters, vol. 8, no. 4, pp. 838-843. https://doi.org/10.1021/acs.jpclett.6b02854

TY - JOUR

T1 - Photocurrent Spectroscopy of Perovskite Layers and Solar Cells: A Sensitive Probe of Material Degradation

AU - Holovský, Jakub

AU - De Wolf, Stefaan

AU - Werner, Jérémie

AU - Remeš, Zdeněk

AU - Müller, Martin

AU - Neykova, Neda

AU - Ledinský, Martin

AU - Černá, Ladislava

AU - Hrzina, Pavel

AU - Löper, Philipp

AU - Niesen, Bjoern

AU - Ballif, Christophe

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: The authors acknowledge financial support from Czech Science Foundation Project No. 17-26041Y, the Project KONNECT- 007 of the Czech Academy of Sciences, the Czech Ministry of Education, Youth and Sports Projects LM2015087 and CZ.02.1.01/0.0/0.0/15_003/0000464 Centre of Advanced Photovoltaics, and the Swiss National Science Foundation through Nanotera and PNR 70 program. We thank Prof. Roman Grill and Dr. Thomas Dittrich for fruitful discussions.

PY - 2017/2/6

Y1 - 2017/2/6

N2 - Optical absorptance spectroscopy of polycrystalline CHNHPbI films usually indicates the presence of a PbI phase, either as a preparation residue or due to film degradation, but gives no insight on how this may affect electrical properties. Here, we apply photocurrent spectroscopy to both perovskite solar cells and coplanar-contacted layers at various stages of degradation. In both cases, we find that the presence of a PbI phase restricts charge-carrier transport, suggesting that PbI encapsulates CHNHPbI grains. We also find that PbI injects holes into the CHNHPbI grains, increasing the apparent photosensitivity of PbI. This phenomenon, known as modulation doping, is absent in the photocurrent spectra of solar cells, where holes and electrons have to be collected in pairs. This interpretation provides insights into the photogeneration and carrier transport in dual-phase perovskites.

AB - Optical absorptance spectroscopy of polycrystalline CHNHPbI films usually indicates the presence of a PbI phase, either as a preparation residue or due to film degradation, but gives no insight on how this may affect electrical properties. Here, we apply photocurrent spectroscopy to both perovskite solar cells and coplanar-contacted layers at various stages of degradation. In both cases, we find that the presence of a PbI phase restricts charge-carrier transport, suggesting that PbI encapsulates CHNHPbI grains. We also find that PbI injects holes into the CHNHPbI grains, increasing the apparent photosensitivity of PbI. This phenomenon, known as modulation doping, is absent in the photocurrent spectra of solar cells, where holes and electrons have to be collected in pairs. This interpretation provides insights into the photogeneration and carrier transport in dual-phase perovskites.

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UR - http://pubs.acs.org/doi/abs/10.1021/acs.jpclett.6b02854

UR - http://www.scopus.com/inward/record.url?scp=85013082923&partnerID=8YFLogxK

U2 - 10.1021/acs.jpclett.6b02854

DO - 10.1021/acs.jpclett.6b02854

M3 - Article

C2 - 28121155

SN - 1948-7185

VL - 8

SP - 838

EP - 843

JO - The Journal of Physical Chemistry Letters

JF - The Journal of Physical Chemistry Letters

IS - 4

ER -

Photocurrent Spectroscopy of Perovskite Layers and Solar Cells: A Sensitive Probe of Material Degradation

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