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http://hdl.handle.net/10397/95690
Title: | The critical role of composition-dependent intragrain planar defects in the performance of MA₁–xFAxPbI₃ perovskite solar cells | Authors: | Li, W Rothmann, MU Zhu, Y Chen, W Yang, C Yuan, Y Choo, YY Wen, X Cheng, YB Bach, U Etheridge, J |
Issue Date: | Jun-2021 | Source: | Nature Energy, June 2021, v. 6, no. 6, p. 624-632 | Abstract: | Perovskite solar cells show excellent power conversion efficiencies, long carrier diffusion lengths and low recombination rates. This encourages a view that intragrain defects are electronically benign with little impact on device performance. In this study we varied the methylammonium (MA)/formamidinium (FA) composition in MA₁–xFAxPbI₃ (x = 0–1), and compared the structure and density of the intragrain planar defects with device performance, otherwise keeping the device nominally the same. We found that charge carrier lifetime, open-circuit voltage deficit and current density–voltage hysteresis correlate empirically with the density and structure of {111}c planar defects (x = 0.5–1) and {112}t twin boundaries (x = 0–0.1). The best performance parameters were found when essentially no intragrain planar defects were evident (x = 0.2). Similarly, reducing the density of {111}c planar defects through MASCN vapour treatment of FAPbI₃ (x ≈ 1) also improved performance. These observations suggest that intragrain defect control can provide an important route for improving perovskite solar cell performance, in addition to well-established parameters such as grain boundaries and interfaces. | Keywords: | MA₁–xFAxPbI₃ | Publisher: | Nature Publishing Group | Journal: | Nature energy | EISSN: | 2058-7546 | DOI: | 10.1038/s41560-021-00830-9 | Rights: | © The Author(s), under exclusive licence to Springer Nature Limited 2021 This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1038/s41560-021-00830-9. |
Appears in Collections: | Journal/Magazine Article |
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Zhu_Critical_Role_Composition-Dependent.pdf | Pre-Published version | 3.79 MB | Adobe PDF | View/Open |
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