Molecular modulator for stable inverted planar perovskite solar cells with efficiency enhanced by interface engineering

Z. Q. Zhao; S. You; J. Huang; L. Yuan; Z. Y. Xiao; Y. Cao; N. Cheng; L. Hu; J. F. Liu; Benhai Yu

doi:10.1039/c9tc03259b

Molecular modulator for stable inverted planar perovskite solar cells with efficiency enhanced by interface engineering

Z. Q. Zhao^*, S. You, J. Huang, L. Yuan, Z. Y. Xiao, Y. Cao, N. Cheng, L. Hu, J. F. Liu, Benhai Yu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

Hybrid organic/inorganic organometal halide perovskite solar cells (PSCs) have been attracting enormous research interest. However, their performance improvement and engineering at the molecular level remain challenging for the inverted structures. Surface traps present in semiconductor films critically influence ultimate photovoltaic behaviors. A solution-processable and stable cathode buffer layer that can passivate surface traps is thus of great importance for the application of PSCs. Here, we successfully fabricated high performance and stable inverted planar PSCs by employing calcium acetylacetonate (Ca(acac)₂), a molecular modulator, as the cathode interfacial layer (CIL). The average power conversion efficiencies of PSCs based on different perovskite photoactive layers were improved. Strikingly, FA_0.85MA_0.15Pb(I_0.85Br_0.15)₃-based and MAPbI₃-based PSC devices were found to have champion power conversion efficiencies of 20.15% and 18.23%, respectively. Importantly, Ca(acac)₂-modified PSCs also have high stability. Their power conversion efficiencies decreased by only 15% after 30 days of storage and they show much suppressed hysteresis compared with the control devices (without interfacial modification).

Original language	English
Pages (from-to)	9735-9742
Number of pages	8
Journal	Journal of Materials Chemistry C
Volume	7
Issue number	31
DOIs	https://doi.org/10.1039/c9tc03259b
Publication status	Published - 21 Aug 2019
Externally published	Yes

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title = "Molecular modulator for stable inverted planar perovskite solar cells with efficiency enhanced by interface engineering",

abstract = "Hybrid organic/inorganic organometal halide perovskite solar cells (PSCs) have been attracting enormous research interest. However, their performance improvement and engineering at the molecular level remain challenging for the inverted structures. Surface traps present in semiconductor films critically influence ultimate photovoltaic behaviors. A solution-processable and stable cathode buffer layer that can passivate surface traps is thus of great importance for the application of PSCs. Here, we successfully fabricated high performance and stable inverted planar PSCs by employing calcium acetylacetonate (Ca(acac)2), a molecular modulator, as the cathode interfacial layer (CIL). The average power conversion efficiencies of PSCs based on different perovskite photoactive layers were improved. Strikingly, FA0.85MA0.15Pb(I0.85Br0.15)3-based and MAPbI3-based PSC devices were found to have champion power conversion efficiencies of 20.15% and 18.23%, respectively. Importantly, Ca(acac)2-modified PSCs also have high stability. Their power conversion efficiencies decreased by only 15% after 30 days of storage and they show much suppressed hysteresis compared with the control devices (without interfacial modification).",

author = "Zhao, {Z. Q.} and S. You and J. Huang and L. Yuan and Xiao, {Z. Y.} and Y. Cao and N. Cheng and L. Hu and Liu, {J. F.} and Benhai Yu",

year = "2019",

month = aug,

day = "21",

doi = "10.1039/c9tc03259b",

language = "English",

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pages = "9735--9742",

journal = "Journal of Materials Chemistry C",

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publisher = "Royal Society of Chemistry",

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TY - JOUR

T1 - Molecular modulator for stable inverted planar perovskite solar cells with efficiency enhanced by interface engineering

AU - Zhao, Z. Q.

AU - You, S.

AU - Huang, J.

AU - Yuan, L.

AU - Xiao, Z. Y.

AU - Cao, Y.

AU - Cheng, N.

AU - Hu, L.

AU - Liu, J. F.

AU - Yu, Benhai

PY - 2019/8/21

Y1 - 2019/8/21

N2 - Hybrid organic/inorganic organometal halide perovskite solar cells (PSCs) have been attracting enormous research interest. However, their performance improvement and engineering at the molecular level remain challenging for the inverted structures. Surface traps present in semiconductor films critically influence ultimate photovoltaic behaviors. A solution-processable and stable cathode buffer layer that can passivate surface traps is thus of great importance for the application of PSCs. Here, we successfully fabricated high performance and stable inverted planar PSCs by employing calcium acetylacetonate (Ca(acac)2), a molecular modulator, as the cathode interfacial layer (CIL). The average power conversion efficiencies of PSCs based on different perovskite photoactive layers were improved. Strikingly, FA0.85MA0.15Pb(I0.85Br0.15)3-based and MAPbI3-based PSC devices were found to have champion power conversion efficiencies of 20.15% and 18.23%, respectively. Importantly, Ca(acac)2-modified PSCs also have high stability. Their power conversion efficiencies decreased by only 15% after 30 days of storage and they show much suppressed hysteresis compared with the control devices (without interfacial modification).

AB - Hybrid organic/inorganic organometal halide perovskite solar cells (PSCs) have been attracting enormous research interest. However, their performance improvement and engineering at the molecular level remain challenging for the inverted structures. Surface traps present in semiconductor films critically influence ultimate photovoltaic behaviors. A solution-processable and stable cathode buffer layer that can passivate surface traps is thus of great importance for the application of PSCs. Here, we successfully fabricated high performance and stable inverted planar PSCs by employing calcium acetylacetonate (Ca(acac)2), a molecular modulator, as the cathode interfacial layer (CIL). The average power conversion efficiencies of PSCs based on different perovskite photoactive layers were improved. Strikingly, FA0.85MA0.15Pb(I0.85Br0.15)3-based and MAPbI3-based PSC devices were found to have champion power conversion efficiencies of 20.15% and 18.23%, respectively. Importantly, Ca(acac)2-modified PSCs also have high stability. Their power conversion efficiencies decreased by only 15% after 30 days of storage and they show much suppressed hysteresis compared with the control devices (without interfacial modification).

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DO - 10.1039/c9tc03259b

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JO - Journal of Materials Chemistry C

JF - Journal of Materials Chemistry C

IS - 31

ER -

Molecular modulator for stable inverted planar perovskite solar cells with efficiency enhanced by interface engineering

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