Modulating Efficiency and stability of Methylammonium/Br-Free Perovskite Solar Cells Using Fluoroarene Hydrazine

KHADKA, Dhruba Bahadur; SHIRAI, Yasuhiro; YANAGIDA, Masatoshi; MIYANO, Kenjiro

Poster Modulating Efficiency and stability of Methylammonium/Br-Free Perovskite Solar Cells Using Fluoroarene Hydrazine

KHADKA, Dhruba Bahadur (Research Center for Energy and Environmental Materials (GREEN)/Battery and Cell Materials Field/Photovoltaic Materials Group, National Institute for Materials Science) ; SHIRAI, Yasuhiro (Research Center for Energy and Environmental Materials (GREEN)/Battery and Cell Materials Field/Photovoltaic Materials Group, National Institute for Materials Science) ; YANAGIDA, Masatoshi (Research Center for Energy and Environmental Materials (GREEN)/Battery and Cell Materials Field/Photovoltaic Materials Group, National Institute for Materials Science) ; MIYANO, Kenjiro (Human Resources Division, National Institute for Materials Science)

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KHADKA, Dhruba Bahadur, SHIRAI, Yasuhiro, YANAGIDA, Masatoshi, MIYANO, Kenjiro. Modulating Efficiency and stability of Methylammonium/Br-Free Perovskite Solar Cells Using Fluoroarene Hydrazine. https://doi.org/10.48505/nims.4196

(BibTeX)

Alternative title: フルオロアレーンヒドラジンを使用したメチルアンモニウム/Brフリーペロブスカイト太陽電池の効率と安定性の調整

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(abstract)

Halide perovskite solar cells (PSCs) with state-of-the-art efficiencies consist of thermally unstable methylammonium (MA). In this report, we have employed the surface passivation method with multifunctional fluoroarene molecule, which suppresses the formation of PbI2 and δ-perovskite phase in MA/Br-free perovskite film. The penta fluoro-phenylhydrazine (5F-PHZ) passivation effectively mitigates the defects at surface or grain boundaries in perovskite film with fluoroarene embedded interfacial layer as a consequence of stronger halogen bonding with fluoroarene moieties or NH-NH2 terminal. As a result, the PSC with a p-i-n configuration achieved superior operational thermal stability and a PCE exceeding 22 % with a large area of ~1 cm2. This work underscores a universal strategy for defect passivation to further improvement of efficiency using a multifunctional passivator. This report gives insights into the film growth properties, device photo-physics, and defect analysis correlating with device performance and device stability.

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