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Issue 8, 2019
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Picosecond multi-hole transfer and microsecond charge-separated states at the perovskite nanocrystal/tetracene interface

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Abstract

Hole transfer (HT) is often kinetically sluggish compared to electron transfer (ET), which increases recombination losses and thus limits the efficiency of many energy conversion devices such as light-emitting diodes, solar cells and solar-fuel production systems. Recently introduced lead halide perovskites and their nanocrystals (NCs) have emerged as an important class of energy conversion materials. Here we report that tetracene molecules can enable ultrafast and efficient HT from perovskite NCs. Transient absorption measurements reveal that HT occurs in 7.6 ± 0.2 ps, and the charge-separated states are extremely long-lived (5.1 ± 0.3 μs). Such exceptional charge separation properties are leveraged to demonstrate the dissociation of up to 5.6 excitons per NC by multi-hole transfer for the first time. These results not only suggest that tetracenes are an effective hole-extracting material for perovskite devices, but also have important implications for using perovskite NCs as sensitizers and tetracenes as redox mediators to drive single and even multi-electron photochemical reactions.

Graphical abstract: Picosecond multi-hole transfer and microsecond charge-separated states at the perovskite nanocrystal/tetracene interface

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Publication details

The article was received on 04 Oct 2018, accepted on 21 Dec 2018 and first published on 21 Dec 2018


Article type: Edge Article
DOI: 10.1039/C8SC04408B
Citation: Chem. Sci., 2019,10, 2459-2464
  • Open access: Creative Commons BY license
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    Picosecond multi-hole transfer and microsecond charge-separated states at the perovskite nanocrystal/tetracene interface

    X. Luo, G. Liang, J. Wang, X. Liu and K. Wu, Chem. Sci., 2019, 10, 2459
    DOI: 10.1039/C8SC04408B

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