# Fileset

[IEEE-PVSC-2023-5F-PHZ.pdf](https://mdr.nims.go.jp/filesets/66d90629-27ea-4c01-8add-412dd908b236/download)

## Creator

[KHADKA, Dhruba Bahadur](https://orcid.org/0000-0001-9134-3890), [SHIRAI, Yasuhiro](https://orcid.org/0000-0003-2164-5468), [YANAGIDA, Masatoshi](https://orcid.org/0000-0002-8065-7875), [MIYANO, Kenjiro](https://orcid.org/0000-0002-5869-3087)

## Rights

[Creative Commons BY Attribution 4.0 International](https://creativecommons.org/licenses/by/4.0/)

## Other metadata

[Modulating Efficiency and stability of Methylammonium/Br-Free Perovskite Solar Cells Using Fluoroarene Hydrazine](https://mdr.nims.go.jp/datasets/c4b10ff2-4601-4cb4-87f8-be4efed221d4)

## Fulltext

PowerPoint プレゼンテーションModulating Efficiency and Stability of Methylammonium/Br-Free Perovskite Solar Cells Using Fluoroarene HydrazineIntroduction/Theme under discussionThe authors acknowledge the support of JST-MIRAI Program Grant  Number JPMJMI21E6, Japan.E-mail： * KHADKA.B.Dhruba@nims.go.jp and MIYANO.Kenjiro@nims.go.jp*  • Interface modulation of MA/Br-free HP with fluoroarene functional derivatives• Attenuate defect densities and suppress ion migration• Form interfacial embedded 2D-layers • PCE increase from 18%  to > 22 % - with superior stabilityGlobal Research Center for Environment and Energy based on Nanomaterials Science (GREEN), Photovoltaics Materials Group, National Institute for Materials Science (NIMS), Tsukuba, Japan. Dhruba B. Khadka*, Y. Shirai, M. Yanagida and K. Miyano* SummaryExperimental: Material Growth and Device Analysis0.025 MSchematic of device fabrication approach• Halide perovskite solar cells (PSCs) with state-of-the-art efficiencies consist of thermally unstable methylammonium.• A molecular surface passivation strategy has been used for the mitigation of surface/bulk defects.• Large area device and improved operational stability is important for commercialization Ref : (1) * D. B. Khadka et al. Adv. Energy Mater. 2022, 12, 2202029(2) D. B. Khadka et al. ACS Appl. Energy Mater., 2021, 4,11121–11132,(3) D. B. Khadka et al., ACS Appl. Mater. Interfaces, 2019,11, 7055–7065.(4) Miyano et al. J. Phys. Chem. Lett. 2016,7,2240Device stabilityTime-resolved PL characteristics• δ-phase- perovskite• #- 2D-perovskite• No information in the perovskite lattice0.0 0.2 0.4 0.6 0.8 1.0 1.2-1001020 /  Pristine/  With 5F-PHZJ (mAcm-2)V (V)PCE~ 18.10 %PCE~ 22.29 %HR-TEM- ResultsDevice cross-sectional image Interface Analysis5F-PHZ treated device: superior operational stability Certified device efficiency:  > 1cm2Device statisticsXRD patterns:Surface images of MA/Br-free-perovskite film:Transient photovoltageAbsorption/PL spectra✓5F-PHZ additive: well coverage on the surfaceDFT calculationsCapacitance analysis:➢Defect profile➢Defect densities- attenuated➢ Introduce penta-fluoro-phenylhydrazine (5F-PHZ) as a molecular passivator on HP film to improve the optoelectronic properties. ➢ 5F-PHZ surface treatment quenched the PbI2 and δ-perovskite phase formed in the pristine film. ➢ Suppress of defects at surface or grain boundaries in perovskite film as a consequence of stronger halogen bonding with fluoroarene moieties or NH-NH2 terminal. ➢ 5F-PHZ  passivation is propitious for modification of surface chemistry, interface quality, and moisture tolerability• 5F-PHZ additive: BlueshiftControl HaP:➢ Eg~ 819.48 nm ➢ ~1.513 +/- 0.02 eVAdsorption of 5F-PHZ on perovskite surfaceDOS of  control and 5F-PHZ passivation Slide 1