| Item type |
学術雑誌論文 / Journal Article(1) |
| PubDate |
2020-07-27 |
| Title |
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Title |
Performance-limiting nanoscale trap clusters at grain junctions in halide perovskites |
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Language |
en |
| Language |
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Language |
eng |
| Resource Type |
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Resource Type Identifier |
http://purl.org/coar/resource_type/c_6501 |
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Resource Type |
journal article |
| Author |
Doherty, Tiarnan A. S.
Winchester, Andrew J.
Macpherson, Stuart
Johnstone, Duncan N.
Pareek, Vivek
Tennyson, Elizabeth M.
Kosar, Sofiia
Kosasih, Felix U.
Anaya, Miguel
Abdi-Jalebi, Mojtaba
Andaji-Garmaroudi, Zahra
Wong, E Laine
Madéo, Julien
Chiang, Yu-Hsien
Park, Ji-Sang
Jung, Young-Kwang
Petoukhoff, Christopher E.
Divitini, Giorgio
Man, Michael K. L.
Ducati, Caterina
Walsh, Aron
Midgley, Paul A.
Dani, Keshav M.
Stranks, Samuel D.
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| Bibliographic Information |
en : Nature
Volume Number 580,
Issue Number 7803,
p. 360-366,
Issue Date 2020-04-15
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| Abstract |
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Description Type |
Other |
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Description |
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 devices(1,2). This strong performance (albeit below the practical limits of about 30 per cent and 35 per cent, respectively(3)) is surprising in thin films processed from solution at low-temperature, a method that generally produces abundant crystalline defects(4). Although point defects often induce only shallow electronic states in the perovskite bandgap that do not affect performance(5), 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 performance(6). The origin and distribution of these trap states are unknown, but they have been associated with light-induced halide segregation in mixed-halide perovskite compositions(7) and with local strain(8), both of which make devices less stable(9). 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 process(10,11), 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. |
| Publisher |
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Publisher |
Nature Research |
| ISSN |
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Source Identifier Type |
ISSN |
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Source Identifier |
0028-0836 |
| ISSN |
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Source Identifier Type |
ISSN |
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Source Identifier |
1476-4687 |
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Relation Type |
isVersionOf |
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Identifier Type |
PMID |
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Related Identifier |
info:pmid/32296189 |
| DOI |
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Relation Type |
isVersionOf |
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Identifier Type |
DOI |
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Related Identifier |
info:doi/10.1038/s41586-020-2184-1 |
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Identifier Type |
URI |
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Related Identifier |
https://www.nature.com/articles/s41586-020-2184-1 |
| Author's flag |
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Version Type |
AM |
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Version Type Resource |
http://purl.org/coar/version/c_ab4af688f83e57aa |
combined_paper_20200708_Final Version_with fig (4.5 MB)
