Cage Molecules Stabilize Lead Halide Perovskite Thin Films
The environmental stability of hybrid organic–inorganic perovskite (HOIP) materials needs to increase to enable their widespread adoption in thin-film solar and optoelectronic devices. Molecular additives have recently emerged as an effective strategy for regulating HOIP crystal growth and passivati...
| Main Authors: | , , , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
American Chemical Society
2024
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| Online Access: | https://hdl.handle.net/1721.1/155275 |
| _version_ | 1826201319350730752 |
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| author | Sun, Shijing Liu, Ming Thapa, Janak Hartono, Noor Titan Putri Zhao, Yicheng He, Donglin Wieghold, Sarah Chua, Matthew Wu, Yue Bulović, Vladimir Ling, Sanliang Brabec, Christoph J. Cooper, Andrew I. Buonassisi, Tonio |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Sun, Shijing Liu, Ming Thapa, Janak Hartono, Noor Titan Putri Zhao, Yicheng He, Donglin Wieghold, Sarah Chua, Matthew Wu, Yue Bulović, Vladimir Ling, Sanliang Brabec, Christoph J. Cooper, Andrew I. Buonassisi, Tonio |
| author_sort | Sun, Shijing |
| collection | MIT |
| description | The environmental stability of hybrid organic–inorganic perovskite (HOIP) materials needs to increase to enable their widespread adoption in thin-film solar and optoelectronic devices. Molecular additives have recently emerged as an effective strategy for regulating HOIP crystal growth and passivating defects. However, to date the choice of additives is largely limited to a dozen or so materials under the design philosophy that high crystallinity is a prerequisite for stable HOIP thin films. In this study, we incorporate porous organic cages (POCs) as functional additives into perovskite thin films for the first time and investigate the HOIP–POC interaction via a combined experimental and computational approach. POCs are significantly larger than the small-molecule additives explored for HOIP synthesis to date but much smaller than polymeric sealants. Partially amorphized composites of MAPbI3 (methylammonium lead iodide, HOIP) and RCC3 (an amine POC) form a network-like surface topography and lead to an increase in the optical bandgap from 1.60 to 1.63 eV. Further in situ optical imaging suggests that RCC3 can delay the MAPbI3 film degradation onset up to 50× under heat and humidity stresses, showing promise for improving reliability in HOIP-based solar-cell and light-emitting applications. Furthermore, there is evidence of molecular interactions between RCC3 and MAPbI3, as fingerprinted by the suppressed N–H stretching mode in MA+ from Fourier transform infrared (FTIR) spectra and density functional theory (DFT) simulations that suggest strong hydrogen bonding between MA+ and RCC3. Given the diversity of POCs and HOIPs, our work opens a new avenue to stabilize HOIPs via tailored molecular interactions with functional organic materials. |
| first_indexed | 2024-09-23T11:49:41Z |
| format | Article |
| id | mit-1721.1/155275 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2025-02-19T04:20:52Z |
| publishDate | 2024 |
| publisher | American Chemical Society |
| record_format | dspace |
| spelling | mit-1721.1/1552752025-01-04T05:43:53Z Cage Molecules Stabilize Lead Halide Perovskite Thin Films Sun, Shijing Liu, Ming Thapa, Janak Hartono, Noor Titan Putri Zhao, Yicheng He, Donglin Wieghold, Sarah Chua, Matthew Wu, Yue Bulović, Vladimir Ling, Sanliang Brabec, Christoph J. Cooper, Andrew I. Buonassisi, Tonio Massachusetts Institute of Technology. Department of Mechanical Engineering Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science The environmental stability of hybrid organic–inorganic perovskite (HOIP) materials needs to increase to enable their widespread adoption in thin-film solar and optoelectronic devices. Molecular additives have recently emerged as an effective strategy for regulating HOIP crystal growth and passivating defects. However, to date the choice of additives is largely limited to a dozen or so materials under the design philosophy that high crystallinity is a prerequisite for stable HOIP thin films. In this study, we incorporate porous organic cages (POCs) as functional additives into perovskite thin films for the first time and investigate the HOIP–POC interaction via a combined experimental and computational approach. POCs are significantly larger than the small-molecule additives explored for HOIP synthesis to date but much smaller than polymeric sealants. Partially amorphized composites of MAPbI3 (methylammonium lead iodide, HOIP) and RCC3 (an amine POC) form a network-like surface topography and lead to an increase in the optical bandgap from 1.60 to 1.63 eV. Further in situ optical imaging suggests that RCC3 can delay the MAPbI3 film degradation onset up to 50× under heat and humidity stresses, showing promise for improving reliability in HOIP-based solar-cell and light-emitting applications. Furthermore, there is evidence of molecular interactions between RCC3 and MAPbI3, as fingerprinted by the suppressed N–H stretching mode in MA+ from Fourier transform infrared (FTIR) spectra and density functional theory (DFT) simulations that suggest strong hydrogen bonding between MA+ and RCC3. Given the diversity of POCs and HOIPs, our work opens a new avenue to stabilize HOIPs via tailored molecular interactions with functional organic materials. 2024-06-14T16:03:25Z 2024-06-14T16:03:25Z 2022-10-26 2024-06-14T15:58:22Z Article http://purl.org/eprint/type/JournalArticle 0897-4756 1520-5002 https://hdl.handle.net/1721.1/155275 Chem. Mater. 2022, 34, 21, 9384–9391. en 10.1021/acs.chemmater.2c01502 Chemistry of Materials Creative Commons Attribution-Noncommercial-ShareAlike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf American Chemical Society Author |
| spellingShingle | Sun, Shijing Liu, Ming Thapa, Janak Hartono, Noor Titan Putri Zhao, Yicheng He, Donglin Wieghold, Sarah Chua, Matthew Wu, Yue Bulović, Vladimir Ling, Sanliang Brabec, Christoph J. Cooper, Andrew I. Buonassisi, Tonio Cage Molecules Stabilize Lead Halide Perovskite Thin Films |
| title | Cage Molecules Stabilize Lead Halide Perovskite Thin Films |
| title_full | Cage Molecules Stabilize Lead Halide Perovskite Thin Films |
| title_fullStr | Cage Molecules Stabilize Lead Halide Perovskite Thin Films |
| title_full_unstemmed | Cage Molecules Stabilize Lead Halide Perovskite Thin Films |
| title_short | Cage Molecules Stabilize Lead Halide Perovskite Thin Films |
| title_sort | cage molecules stabilize lead halide perovskite thin films |
| url | https://hdl.handle.net/1721.1/155275 |
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