Structure, Morphology, and Photovoltaic Implications of Halide Alloying in Lead-Free Cs3Sb2ClxI9-x 2D-Layered Perovskites
Abstract
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.
- Authors:
-
[2]
- Indian Association for the Cultivation of Science, Jadavpur, Kolkata (India)
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Publication Date:
- Research Org.:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Org.:
- 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
- OSTI Identifier:
- 1677431
- Alternate Identifier(s):
- OSTI ID: 1786511
- Report Number(s):
- NREL/JA-5900-77107
Journal ID: ISSN 2367-198X; MainId:26053;UUID:1974ffef-09ef-4645-a9c6-4bbdf9322f85;MainAdminID:18589
- Grant/Contract Number:
- AC36-08GO28308
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Solar RRL
- Additional Journal Information:
- Journal Volume: 5; Journal Issue: 1; Journal ID: ISSN 2367-198X
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 14 SOLAR ENERGY; halide alloying; layered perovskite; lead-free; optoelectronic properties; photovoltaic
Citation Formats
Paul, Goutam, Pal, Amlan J., and Larson, Bryon W. Structure, Morphology, and Photovoltaic Implications of Halide Alloying in Lead-Free Cs3Sb2ClxI9-x 2D-Layered Perovskites. United States: N. p., 2020.
Web. doi:10.1002/solr.202000422.
Paul, Goutam, Pal, Amlan J., & Larson, Bryon W. Structure, Morphology, and Photovoltaic Implications of Halide Alloying in Lead-Free Cs3Sb2ClxI9-x 2D-Layered Perovskites. United States. https://doi.org/10.1002/solr.202000422
Paul, Goutam, Pal, Amlan J., and Larson, Bryon W. Wed .
"Structure, Morphology, and Photovoltaic Implications of Halide Alloying in Lead-Free Cs3Sb2ClxI9-x 2D-Layered Perovskites". United States. https://doi.org/10.1002/solr.202000422. https://www.osti.gov/servlets/purl/1677431.
@article{osti_1677431,
title = {Structure, Morphology, and Photovoltaic Implications of Halide Alloying in Lead-Free Cs3Sb2ClxI9-x 2D-Layered Perovskites},
author = {Paul, Goutam and Pal, Amlan J. and Larson, Bryon W.},
abstractNote = {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.},
doi = {10.1002/solr.202000422},
journal = {Solar RRL},
number = 1,
volume = 5,
place = {United States},
year = {Wed Sep 23 00:00:00 EDT 2020},
month = {Wed Sep 23 00:00:00 EDT 2020}
}
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