Performance-limiting nanoscale trap clusters at grain junctions in halide perovskites.
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Authors
Winchester, Andrew J
Pareek, Vivek
Kosar, Sofiia
Andaji-Garmaroudi, Zahra
Chiang, Yu-Hsien
Park, Ji-Sang
Petoukhoff, Christopher E
Publication Date
2020-04Journal Title
Nature
ISSN
0028-0836
Publisher
Springer Science and Business Media LLC
Volume
580
Issue
7803
Pages
360-366
Language
eng
Type
Article
This Version
AM
Physical Medium
Print-Electronic
Metadata
Show full item recordCitation
Doherty, T., Winchester, A. J., Macpherson, S., Johnstone, D., Pareek, V., Tennyson, B., Kosar, S., et al. (2020). Performance-limiting nanoscale trap clusters at grain junctions in halide perovskites.. Nature, 580 (7803), 360-366. https://doi.org/10.1038/s41586-020-2184-1
Abstract
Halide perovskite materials have promising performance characteristics for low-cost optoelectronic applications. Photovoltaic devices fabricated from perovskite absorbers have reached power conversion efficiencies above 25 per cent in single-junction devices and 28 per cent in tandem devices1,2. This strong performance (albeit below the practical limits of about 30 per cent and 35 per cent, respectively3) is surprising in thin films processed from solution at low-temperature, a method that generally produces abundant crystalline defects4. Although point defects often induce only shallow electronic states in the perovskite bandgap that do not affect performance5, perovskite devices still have many states deep within the bandgap that trap charge carriers and cause them to recombine non-radiatively. These deep trap states thus induce local variations in photoluminescence and limit the device performance6. The origin and distribution of these trap states are unknown, but they have been associated with light-induced halide segregation in mixed-halide perovskite compositions7 and with local strain8, both of which make devices less stable9. Here we use photoemission electron microscopy to image the trap distribution in state-of-the-art halide perovskite films. Instead of a relatively uniform distribution within regions of poor photoluminescence efficiency, we observe discrete, nanoscale trap clusters. By correlating microscopy measurements with scanning electron analytical techniques, we find that these trap clusters appear at the interfaces between crystallographically and compositionally distinct entities. Finally, by generating time-resolved photoemission sequences of the photo-excited carrier trapping process10,11, we reveal a hole-trapping character with the kinetics limited by diffusion of holes to the local trap clusters. Our approach shows that managing structure and composition on the nanoscale will be essential for optimal performance of halide perovskite devices.
Relationships
Is supplemented by: https://doi.org/10.17863/CAM.48273
Sponsorship
Engineering and Physical Sciences Research Council (EP/P007767/1)
Engineering and Physical Sciences Research Council (EP/R008779/1)
European Research Council (756962)
Engineering and Physical Sciences Research Council (EP/R023980/1)
Engineering and Physical Sciences Research Council (EP/P024947/1)
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (841386)
Engineering and Physical Sciences Research Council (EP/S019367/1)
Engineering and Physical Sciences Research Council (EP/R00661X/1)
Identifiers
External DOI: https://doi.org/10.1038/s41586-020-2184-1
This record's URL: https://www.repository.cam.ac.uk/handle/1810/307108
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