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Perovskite solar cells (PSCs) with state-of-the-art efficiencies consist of thermally unstable methylammonium (MA). Here, we have introduced interfacial passivation with pentafluoro-phenylhydrazine (5F-PHZ) to fabricate efficient and stable MA/Br-free PSCs. The 5F-PHZ surface treatment quenched the PbI2 and δ-perovskite phase formed in the pristine film. The surface passivation ameliorates the film chemistries at the surface with modulation of interface band alignment as a consequence of halogen bonding with fluoroarene moieties or NH-NH2 terminal. This results in a remarkably longer carrier lifetime with the passivation at the surface and grain boundaries trap centers. As a result, it boosts the power conversion efficiency (PCE) (area~1 cm2) from ~18.10% to 22.29% (VOC ~ 1.096 to 1.178 V) with superior operational thermal stability. We also achieved a certified PCE of 21.01% with a large area of ~1.026 cm2. We found that the surface passivation forms an interfacial embedded layer subsequent to attenuation of defect densities and suppression of ion migration, which is supported by density-function-theory calculation. Importantly, this approach is effective in enhancing the PCE of narrow and wide bandgap perovskite systems. Thus, our work opens up a new way for interface modulation with fluoroarene functional derivatives to achieve superior device performance and stability.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: MA-free perovskite , Fluoroarene, Halogen bonding, Surface passivation, Thermal stability

Date published: 2022-08-17

Publisher: Wiley

Journal:

• Advanced Energy Materials (ISSN: 16146832) vol. 12 issue. 38 2202029

Funding:

• Yazaki Memorial Foundation for Science and Technology

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1002/aenm.202202029

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Updated at: 2024-11-28 16:31:23 +0900

Published on MDR: 2024-11-28 16:31:23 +0900