Structure, Morphology, and Photovoltaic Implications of Halide Alloying in Lead-Free Cs3Sb2ClxI9-x 2D-Layered Perovskites

Paul, Goutam; Pal, Amlan J.; Larson, Bryon W.

doi:10.1002/solr.202000422

Title: Structure, Morphology, and Photovoltaic Implications of Halide Alloying in Lead-Free Cs₃Sb₂Cl_xI_9-x 2D-Layered Perovskites

Journal Article · Wed Sep 23 00:00:00 EDT 2020 · Solar RRL

DOI:https://doi.org/10.1002/solr.202000422· OSTI ID:1677431

Paul, Goutam ^[1]; Pal, Amlan J. ^[1];

^[2]

Indian Association for the Cultivation of Science, Jadavpur, Kolkata (India)
National Renewable Energy Lab. (NREL), Golden, CO (United States)

Compositional tuning is a major driving force behind the excellent optoelectronic properties observed in typical Pb‐based perovskites. For lead‐free perovskite derivatives, a challenge to understand the connection between compositional tuning and intrinsic optoelectronic properties, hence a barrier toward boosting their performance, comes from the fact that multiple crystalline substructures can form based on composition, film processing, or both. Especially with lower dimensional (0D, 1D, and 2D) substructures, the particular polymorph present in the film can be a greater determinant of optoelectronic properties than the composition itself. Herein, a simple method to alloy the halide site in all‐inorganic lead‐free Cs ₃ Sb ₂ I ₉ films is reported while maintaining a consistent 2D‐layered substructure, as a means to independently study the photovoltaic implications of halide substitution. A broad suite of spectroscopy and device measurements is used to identify an optimal stoichiometric substitution of chloride for iodide (≈8 mol%, measured) that balances both intrinsic and bulk optoelectronic properties to achieve a top power conversion efficiency of 2.2%. This work underscores the importance of controlling substructure while investigating the impacts of compositional tuning for the development of lead‐free perovskites and more broadly validates the approach toward realizing lead‐free alternative perovskite solar technologies.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; Council of Scientific & Industrial Research (CSIR); Bhsakara Advanced Solar Energy Fellowship; JC Bose National Fellowship

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1677431

Alternate ID(s):: OSTI ID: 1786511

Report Number(s):: NREL/JA-5900-77107; MainId:26053; UUID:1974ffef-09ef-4645-a9c6-4bbdf9322f85; MainAdminID:18589

Journal Information:: Solar RRL, Vol. 5, Issue 1; ISSN 2367-198X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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14 SOLAR ENERGY
halide alloying
layered perovskite
lead-free
optoelectronic properties
photovoltaic

Title: Structure, Morphology, and Photovoltaic Implications of Halide Alloying in Lead-Free Cs3Sb2ClxI9-x 2D-Layered Perovskites

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References (48)

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Related Subjects

Title: Structure, Morphology, and Photovoltaic Implications of Halide Alloying in Lead-Free Cs₃Sb₂Cl_xI_9-x 2D-Layered Perovskites