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Charge-carrier dynamics, mobilities and diffusion lengths of 2D-3D hybrid butylammonium-caesium-formamidinium lead halide perovskites
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Buizza, Leonardo R. V., Crothers, Timothy W., Patel, Jay B., Milot, Rebecca, Johnston, Michael B., Snaith, Henry J. and Herz, Laura M. (2019) Charge-carrier dynamics, mobilities and diffusion lengths of 2D-3D hybrid butylammonium-caesium-formamidinium lead halide perovskites. Advanced Functional Materials, 29 (35). 1902656. doi:10.1002/adfm.201902656 ISSN 1616-301X.
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Official URL: https://doi.org/10.1002/adfm.201902656
Abstract
Perovskite solar cells have improved dramatically over the past decade, increasing in efficiency and gradually overcoming hurdles of temperature- and humidity-induced instability. Materials that combine high charge-carrier lifetimes and mobilities, strong absorption and good crystallinity of three-dimensional (3D) perovskites with the hydrophobic properties of two-dimensional (2D) perovskites have become particularly promising candidates for use in solar cells. In order to fully understand the optoelectronic properties of these 2D-3D hybrid systems we investigate the hybrid perovskite BAx(FA0.83Cs0.17)1-xPb(I0.6Br0.4)3 across the composition range 0 ≤ x ≤ 0.8. We find that small amounts of butylammonium (BA) help to improve crystallinity and appear to passivate grain boundaries, thus reducing trap-mediated charge-carrier recombination and enhancing charge-carrier mobilities. Excessive amounts of BA lead to poor crystallinity and inhomogeneous films formation, greatly reducing charge-carrier mobility. For low amounts of BA the benevolent effects of reduced recombination and enhanced mobilities lead to charge-carrier diffusion lengths up to
| Item Type: | Journal Article | ||||||||
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Journal or Publication Title: | Advanced Functional Materials | ||||||||
| Publisher: | Wiley - V C H Verlag GmbH & Co. KGaA | ||||||||
| ISSN: | 1616-301X | ||||||||
| Official Date: | 28 August 2019 | ||||||||
| Dates: |
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| Volume: | 29 | ||||||||
| Number: | 35 | ||||||||
| Article Number: | 1902656 | ||||||||
| DOI: | 10.1002/adfm.201902656 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Reuse Statement (publisher, data, author rights): | This is the peer reviewed version of the following article: [FULL CITE], which has been published in final form at [Link to final article using the DOI]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. | ||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||
| Date of first compliant deposit: | 12 June 2019 | ||||||||
| Date of first compliant Open Access: | 28 June 2019 | ||||||||
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