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

electron Microscopy and Microanalysis

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166 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

Funding

This work was supported by the National Research Foundation of Korea (NRF) grants funded by the Ministry of Science, ICT Future Planning (MSIP) of Korea under contracts NRF-2012M3A6A7054861 (Global Frontier R&D Program on Center for Multiscale Energy System), NRF-2016M3D1A1027663 and NRF-2016M3D1A1027664 (Future Materials Discovery Program), and NRF-2015M1A2A2053004 (Climate Change Management Program).

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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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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

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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.

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

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