Amine-Thiol/Selenol Chemistry for Efficient and Stable Perovskite Solar Cells

Finkenauer, Blake P.; Zhang, Yiyuan; Ma, Ke; Turnley, Jonathan W.; Schulz, Jacob; Gómez, Martín; Coffey, Aidan H.; Sun, Dewei; Sun, Jiaonan; Agrawal, Rakesh; Huang, Libai; Dou, Letian

doi:10.1021/acs.jpcc.2c06967

Amine-Thiol/Selenol Chemistry for Efficient and Stable Perovskite Solar Cells

Journal Article · Wed Jan 04 00:00:00 UTC 2023 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.2c06967· OSTI ID:1903131

^[1]; Zhang, Yiyuan ^[2]; Ma, Ke ^[2]; ^[2]; Schulz, Jacob ^[2]; ^[2]; Coffey, Aidan H. ^[2]; Sun, Dewei ^[2]; ^[2]; ^[2]; ^[2]; ^[2]

Purdue Univ., West Lafayette, IN (United States); Purdue University
Purdue Univ., West Lafayette, IN (United States)

Controlling the crystallization of perovskites is imperative to reduce defect densities in perovskite thin films and extend device lifetimes. In this work, combinations of amine and chalcogenide ligands were introduced in the sequential deposition method to fabricate highly crystalline and orientated formamidinium lead iodide thin films with reduced defect densities and increased charge carrier lifetimes. The dual additives can tune the perovskite intermediate state and control the crystallization leading to devices with improved efficiencies and stabilities. While thiophenol failed to prevent the amine ligand from degrading the perovskite precursors, benzene selenol combinations with amine-ligands drastically changed the solution chemistry to increase the PbI₂ conversion to highly crystalline and orientated α-FAPbI₃ films with lower defect densities. X-ray photoelectron spectroscopy studies reveal benzene selenol evaporates from the thin film leaving behind a modified surface, which is associated with the amine additive. These results indicate the amine selection can be used to tune the surface properties. Lastly, we propose a highly tunable I₂ reduction strategy using chalcogenide chemistry to help enable the realization of perovskite solar cells with high performance and stability.

View Accepted Manuscript (DOE)

Research Organization:: Purdue Univ., West Lafayette, IN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: EE0009519

OSTI ID:: 1903131

Journal Information:: Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 2 Vol. 127; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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