Bication Thiocyanate Salts for Advanced Performance of Wide-Band Gap Perovskite Solar Cells

Mi Seon Bae; Yun Hee Chang; Wonjong Lee; Chan Su Moon; Seung Woo Kim; Hyun Suk Kim; Jongchul Lim; Tae Youl Yang

doi:10.1021/acs.energyfuels.2c04316

Bication Thiocyanate Salts for Advanced Performance of Wide-Band Gap Perovskite Solar Cells

Mi Seon Bae, Yun Hee Chang, Wonjong Lee, Chan Su Moon, Seung Woo Kim, Hyun Suk Kim, Jongchul Lim, Tae Youl Yang

Department of Energy and Materials Engineering

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

9 Scopus citations

Abstract

Organohalide perovskite materials with a high band gap of over 1.65 eV are employed in tandem photovoltaic cells, but higher defect density, deeper trap states, and halide separation in the perovskites limit the performance of all of the tandem cells. In this study, a thiocyanate (SCN)-based ionic liquid, 1-butyl-3-methylimidazolium thiocyanate (BMI-Th), was added to the perovskite material to improve its performance and stability. BMI-Th-added perovskite solar cells (PSCs) display higher power conversion efficiency (PCE) but insufficient stability at high temperatures. When Pb(SCN)₂ was additionally incorporated with BMI-Th, the passivation of defects was strengthened, thereby resulting in enhanced PCE and stability at high temperatures. PSCs with BMI-Pb bication SCN additives achieved improved performance with higher open-circuit voltage and lower hysteresis as well as long-term operational stability under AM 1.5 G 1 sun illumination at 60 °C without any encapsulation.

Original language	English
Pages (from-to)	4608-4615
Number of pages	8
Journal	Energy and Fuels
Volume	37
Issue number	6
DOIs	https://doi.org/10.1021/acs.energyfuels.2c04316
State	Published - 16 Mar 2023

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title = "Bication Thiocyanate Salts for Advanced Performance of Wide-Band Gap Perovskite Solar Cells",

abstract = "Organohalide perovskite materials with a high band gap of over 1.65 eV are employed in tandem photovoltaic cells, but higher defect density, deeper trap states, and halide separation in the perovskites limit the performance of all of the tandem cells. In this study, a thiocyanate (SCN)-based ionic liquid, 1-butyl-3-methylimidazolium thiocyanate (BMI-Th), was added to the perovskite material to improve its performance and stability. BMI-Th-added perovskite solar cells (PSCs) display higher power conversion efficiency (PCE) but insufficient stability at high temperatures. When Pb(SCN)2 was additionally incorporated with BMI-Th, the passivation of defects was strengthened, thereby resulting in enhanced PCE and stability at high temperatures. PSCs with BMI-Pb bication SCN additives achieved improved performance with higher open-circuit voltage and lower hysteresis as well as long-term operational stability under AM 1.5 G 1 sun illumination at 60 °C without any encapsulation.",

author = "Bae, {Mi Seon} and Chang, {Yun Hee} and Wonjong Lee and Moon, {Chan Su} and Kim, {Seung Woo} and Kim, {Hyun Suk} and Jongchul Lim and Yang, {Tae Youl}",

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T1 - Bication Thiocyanate Salts for Advanced Performance of Wide-Band Gap Perovskite Solar Cells

AU - Bae, Mi Seon

AU - Chang, Yun Hee

AU - Lee, Wonjong

AU - Moon, Chan Su

AU - Kim, Seung Woo

AU - Kim, Hyun Suk

AU - Lim, Jongchul

AU - Yang, Tae Youl

PY - 2023/3/16

Y1 - 2023/3/16

N2 - Organohalide perovskite materials with a high band gap of over 1.65 eV are employed in tandem photovoltaic cells, but higher defect density, deeper trap states, and halide separation in the perovskites limit the performance of all of the tandem cells. In this study, a thiocyanate (SCN)-based ionic liquid, 1-butyl-3-methylimidazolium thiocyanate (BMI-Th), was added to the perovskite material to improve its performance and stability. BMI-Th-added perovskite solar cells (PSCs) display higher power conversion efficiency (PCE) but insufficient stability at high temperatures. When Pb(SCN)2 was additionally incorporated with BMI-Th, the passivation of defects was strengthened, thereby resulting in enhanced PCE and stability at high temperatures. PSCs with BMI-Pb bication SCN additives achieved improved performance with higher open-circuit voltage and lower hysteresis as well as long-term operational stability under AM 1.5 G 1 sun illumination at 60 °C without any encapsulation.

AB - Organohalide perovskite materials with a high band gap of over 1.65 eV are employed in tandem photovoltaic cells, but higher defect density, deeper trap states, and halide separation in the perovskites limit the performance of all of the tandem cells. In this study, a thiocyanate (SCN)-based ionic liquid, 1-butyl-3-methylimidazolium thiocyanate (BMI-Th), was added to the perovskite material to improve its performance and stability. BMI-Th-added perovskite solar cells (PSCs) display higher power conversion efficiency (PCE) but insufficient stability at high temperatures. When Pb(SCN)2 was additionally incorporated with BMI-Th, the passivation of defects was strengthened, thereby resulting in enhanced PCE and stability at high temperatures. PSCs with BMI-Pb bication SCN additives achieved improved performance with higher open-circuit voltage and lower hysteresis as well as long-term operational stability under AM 1.5 G 1 sun illumination at 60 °C without any encapsulation.

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U2 - 10.1021/acs.energyfuels.2c04316

DO - 10.1021/acs.energyfuels.2c04316

M3 - Article

AN - SCOPUS:85149013646

SN - 0887-0624

VL - 37

SP - 4608

EP - 4615

JO - Energy and Fuels

JF - Energy and Fuels

IS - 6

ER -

Bication Thiocyanate Salts for Advanced Performance of Wide-Band Gap Perovskite Solar Cells

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