The importance of moisture in hybrid lead halide perovskite thin film fabrication
Moisture, in the form of ambient humidity, has a significant impact on methylammonium lead halide perovskite films. In particular, due to the hygroscopic nature of the methylammonium component, moisture plays a significant role during film formation. This issue has so far not been well understood an...
Main Authors: | , , , , , , , , , , , , |
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Format: | Journal article |
Language: | English |
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American Chemical Society
2015
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author | Eperon, GE Habisreutinger, SN Leijtens, T Bruijnaers, BJ van Franeker, JJ deQuilettes, DW Pathak, S Sutton, RJ Grancini, G Ginger, DS Janssen, RAJ Petrozza, A Snaith, HJ |
author_facet | Eperon, GE Habisreutinger, SN Leijtens, T Bruijnaers, BJ van Franeker, JJ deQuilettes, DW Pathak, S Sutton, RJ Grancini, G Ginger, DS Janssen, RAJ Petrozza, A Snaith, HJ |
author_sort | Eperon, GE |
collection | OXFORD |
description | Moisture, in the form of ambient humidity, has a significant impact on methylammonium lead halide perovskite films. In particular, due to the hygroscopic nature of the methylammonium component, moisture plays a significant role during film formation. This issue has so far not been well understood and neither has the impact of moisture on the physical properties of resultant films. Herein, we carry out a comprehensive and well-controlled study of the effect of moisture exposure on methylammonium lead halide perovskite film formation and properties. We find that films formed in higher humidity atmospheres have a less continuous morphology but significantly improved photoluminescence, and that film formation is faster. In photovoltaic devices, we find that exposure to moisture, either in the precursor solution or in the atmosphere during formation, results in significantly improved open-circuit voltages and hence overall device performance. We then find that by post-treating dry films with moisture exposure, we can enhance photovoltaic performance and photoluminescence in a similar way. The enhanced photoluminescence and open-circuit voltage imply that the material quality is improved in films that have been exposed to moisture. We determine that this improvement stems from a reduction in trap density in the films, which we postulate to be due to the partial solvation of the methylammonium component and “self-healing” of the perovskite lattice. This work highlights the importance of controlled moisture exposure when fabricating high-performance perovskite devices and provides guidelines for the optimum environment for fabrication. Moreover, we note that often an unintentional water exposure is likely responsible for the high performance of solar cells produced in some laboratories, whereas careful synthesis and fabrication in a dry environment will lead to lower-performing devices. |
first_indexed | 2024-03-07T08:22:29Z |
format | Journal article |
id | oxford-uuid:fa9d8f95-8875-4a52-a1f5-8da39a802224 |
institution | University of Oxford |
language | English |
last_indexed | 2024-03-07T08:22:29Z |
publishDate | 2015 |
publisher | American Chemical Society |
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spelling | oxford-uuid:fa9d8f95-8875-4a52-a1f5-8da39a8022242024-02-01T11:46:03ZThe importance of moisture in hybrid lead halide perovskite thin film fabricationJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:fa9d8f95-8875-4a52-a1f5-8da39a802224EnglishSymplectic Elements at OxfordAmerican Chemical Society2015Eperon, GEHabisreutinger, SNLeijtens, TBruijnaers, BJvan Franeker, JJdeQuilettes, DWPathak, SSutton, RJGrancini, GGinger, DSJanssen, RAJPetrozza, ASnaith, HJMoisture, in the form of ambient humidity, has a significant impact on methylammonium lead halide perovskite films. In particular, due to the hygroscopic nature of the methylammonium component, moisture plays a significant role during film formation. This issue has so far not been well understood and neither has the impact of moisture on the physical properties of resultant films. Herein, we carry out a comprehensive and well-controlled study of the effect of moisture exposure on methylammonium lead halide perovskite film formation and properties. We find that films formed in higher humidity atmospheres have a less continuous morphology but significantly improved photoluminescence, and that film formation is faster. In photovoltaic devices, we find that exposure to moisture, either in the precursor solution or in the atmosphere during formation, results in significantly improved open-circuit voltages and hence overall device performance. We then find that by post-treating dry films with moisture exposure, we can enhance photovoltaic performance and photoluminescence in a similar way. The enhanced photoluminescence and open-circuit voltage imply that the material quality is improved in films that have been exposed to moisture. We determine that this improvement stems from a reduction in trap density in the films, which we postulate to be due to the partial solvation of the methylammonium component and “self-healing” of the perovskite lattice. This work highlights the importance of controlled moisture exposure when fabricating high-performance perovskite devices and provides guidelines for the optimum environment for fabrication. Moreover, we note that often an unintentional water exposure is likely responsible for the high performance of solar cells produced in some laboratories, whereas careful synthesis and fabrication in a dry environment will lead to lower-performing devices. |
spellingShingle | Eperon, GE Habisreutinger, SN Leijtens, T Bruijnaers, BJ van Franeker, JJ deQuilettes, DW Pathak, S Sutton, RJ Grancini, G Ginger, DS Janssen, RAJ Petrozza, A Snaith, HJ The importance of moisture in hybrid lead halide perovskite thin film fabrication |
title | The importance of moisture in hybrid lead halide perovskite thin film fabrication |
title_full | The importance of moisture in hybrid lead halide perovskite thin film fabrication |
title_fullStr | The importance of moisture in hybrid lead halide perovskite thin film fabrication |
title_full_unstemmed | The importance of moisture in hybrid lead halide perovskite thin film fabrication |
title_short | The importance of moisture in hybrid lead halide perovskite thin film fabrication |
title_sort | importance of moisture in hybrid lead halide perovskite thin film fabrication |
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