Achieving Reproducible and High-Efficiency (>21%) Perovskite Solar Cells with a Presynthesized FAPbI3 Powder

Yong Zhang; Seongrok Seo; Soo Yeon Lim; Younghoon Kim; Seul Gi Kim; Do Kyoung Lee; Sun Ho Lee; Hyunjung Shin; Hyeonsik Cheong; Nam Gyu Park

doi:10.1021/acsenergylett.9b02348

Achieving Reproducible and High-Efficiency (>21%) Perovskite Solar Cells with a Presynthesized FAPbI3 Powder

Yong Zhang, Seongrok Seo, Soo Yeon Lim, Younghoon Kim, Seul Gi Kim, Do Kyoung Lee, Sun Ho Lee, Hyunjung Shin, Hyeonsik Cheong, Nam Gyu Park

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159 Scopus citations

Abstract

The conventional precursor mixture based on highly pure and expensive PbI2 (purity >99.99%) is problematic in commercializing perovskite solar cells (PSCs) because of a large deviation in the batch-tobatch photovoltaic performance due to underlying nonstoichiometry and/ or the nonperovskite phase. Here, we report on reproducibly efficient (>21%) PSCs based on the ambient-temperature-stable δ-phase FAPbI3 powder, synthesized by reacting PbI2 (either homemade or low-grade commercial product with purity ≪99%) with formamidinium iodide (FAI) at room temperature (∼93% yield). X-ray diffraction patterns confirm that annealing the spin-coated film leads to phase purity of cubic α FAPbI₃. As compared to the conventional precursor mixture based on PbI₂ (purity = 99.9985%), significantly reducing defects in the powderbased film is responsible for the stable and reproducible efficiency. In addition, the homogeneous light-intensity-dependent surface photocurrent contributes to the reproducibility of photovoltaic performance. The quasi-steady-state power conversion efficiency of 21.07% is certified for the device based on FAPbI₃ powder.

Original language	English
Pages (from-to)	360-366
Number of pages	7
Journal	ACS Energy Letters
Volume	5
Issue number	2
DOIs	https://doi.org/10.1021/acsenergylett.9b02348
State	Published - Feb 14 2020
Externally published	Yes

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title = "Achieving Reproducible and High-Efficiency (>21%) Perovskite Solar Cells with a Presynthesized FAPbI3 Powder",

abstract = "The conventional precursor mixture based on highly pure and expensive PbI2 (purity >99.99%) is problematic in commercializing perovskite solar cells (PSCs) because of a large deviation in the batch-tobatch photovoltaic performance due to underlying nonstoichiometry and/ or the nonperovskite phase. Here, we report on reproducibly efficient (>21%) PSCs based on the ambient-temperature-stable δ-phase FAPbI3 powder, synthesized by reacting PbI2 (either homemade or low-grade commercial product with purity ≪99%) with formamidinium iodide (FAI) at room temperature (∼93% yield). X-ray diffraction patterns confirm that annealing the spin-coated film leads to phase purity of cubic α FAPbI3. As compared to the conventional precursor mixture based on PbI2 (purity = 99.9985%), significantly reducing defects in the powderbased film is responsible for the stable and reproducible efficiency. In addition, the homogeneous light-intensity-dependent surface photocurrent contributes to the reproducibility of photovoltaic performance. The quasi-steady-state power conversion efficiency of 21.07% is certified for the device based on FAPbI3 powder.",

author = "Yong Zhang and Seongrok Seo and Lim, {Soo Yeon} and Younghoon Kim and Kim, {Seul Gi} and Lee, {Do Kyoung} and Lee, {Sun Ho} and Hyunjung Shin and Hyeonsik Cheong and Park, {Nam Gyu}",

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T1 - Achieving Reproducible and High-Efficiency (>21%) Perovskite Solar Cells with a Presynthesized FAPbI3 Powder

AU - Zhang, Yong

AU - Seo, Seongrok

AU - Lim, Soo Yeon

AU - Kim, Younghoon

AU - Kim, Seul Gi

AU - Lee, Do Kyoung

AU - Lee, Sun Ho

AU - Shin, Hyunjung

AU - Cheong, Hyeonsik

AU - Park, Nam Gyu

PY - 2020/2/14

Y1 - 2020/2/14

N2 - The conventional precursor mixture based on highly pure and expensive PbI2 (purity >99.99%) is problematic in commercializing perovskite solar cells (PSCs) because of a large deviation in the batch-tobatch photovoltaic performance due to underlying nonstoichiometry and/ or the nonperovskite phase. Here, we report on reproducibly efficient (>21%) PSCs based on the ambient-temperature-stable δ-phase FAPbI3 powder, synthesized by reacting PbI2 (either homemade or low-grade commercial product with purity ≪99%) with formamidinium iodide (FAI) at room temperature (∼93% yield). X-ray diffraction patterns confirm that annealing the spin-coated film leads to phase purity of cubic α FAPbI3. As compared to the conventional precursor mixture based on PbI2 (purity = 99.9985%), significantly reducing defects in the powderbased film is responsible for the stable and reproducible efficiency. In addition, the homogeneous light-intensity-dependent surface photocurrent contributes to the reproducibility of photovoltaic performance. The quasi-steady-state power conversion efficiency of 21.07% is certified for the device based on FAPbI3 powder.

AB - The conventional precursor mixture based on highly pure and expensive PbI2 (purity >99.99%) is problematic in commercializing perovskite solar cells (PSCs) because of a large deviation in the batch-tobatch photovoltaic performance due to underlying nonstoichiometry and/ or the nonperovskite phase. Here, we report on reproducibly efficient (>21%) PSCs based on the ambient-temperature-stable δ-phase FAPbI3 powder, synthesized by reacting PbI2 (either homemade or low-grade commercial product with purity ≪99%) with formamidinium iodide (FAI) at room temperature (∼93% yield). X-ray diffraction patterns confirm that annealing the spin-coated film leads to phase purity of cubic α FAPbI3. As compared to the conventional precursor mixture based on PbI2 (purity = 99.9985%), significantly reducing defects in the powderbased film is responsible for the stable and reproducible efficiency. In addition, the homogeneous light-intensity-dependent surface photocurrent contributes to the reproducibility of photovoltaic performance. The quasi-steady-state power conversion efficiency of 21.07% is certified for the device based on FAPbI3 powder.

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Achieving Reproducible and High-Efficiency (>21%) Perovskite Solar Cells with a Presynthesized FAPbI3 Powder

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