Molecularly thin two-dimensional hybrid perovskites with tunable optoelectronic properties due to reversible surface relaxation

Kai Leng, Ibrahim Abdelwahab, Ivan Verzhbitskiy, Mykola Telychko, Leiqiang Chu, Wei Fu, Xiao Chi, Na Guo, Zhihui Chen, Zhongxin Chen, Chun Zhang, Qing Hua Xu, Jiong Lu, Manish Chhowalla, Goki Eda, Kian Ping Loh

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Due to their layered structure, two-dimensional Ruddlesden–Popper perovskites (RPPs), composed of multiple organic/inorganic quantum wells, can in principle be exfoliated down to few and single layers. These molecularly thin layers are expected to present unique properties with respect to the bulk counterpart, due to increased lattice deformations caused by interface strain. Here, we have synthesized centimetre-sized, pure-phase single-crystal RPP perovskites (CH3(CH2)3NH3)2(CH3NH3)n−1PbnI3n+1 (n = 1–4) from which single quantum well layers have been exfoliated. We observed a reversible shift in excitonic energies induced by laser annealing on exfoliated layers encapsulated by hexagonal boron nitride. Moreover, a highly efficient photodetector was fabricated using a molecularly thin n = 4 RPP crystal, showing a photogain of 105 and an internal quantum efficiency of ~34%. Our results suggest that, thanks to their dynamic structure, atomically thin perovskites enable an additional degree of control for the bandgap engineering of these materials.

Original languageEnglish
Pages (from-to)908-914
Number of pages7
JournalNature Materials
Volume17
Issue number10
DOIs
Publication statusPublished - Oct 1 2018

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Surface relaxation
perovskites
Optoelectronic devices
Semiconductor quantum wells
Boron nitride
Photodetectors
Quantum efficiency
Energy gap
Single crystals
Annealing
Crystals
Lasers
quantum wells
laser annealing
boron nitrides
photometers
quantum efficiency
engineering
shift
single crystals

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Molecularly thin two-dimensional hybrid perovskites with tunable optoelectronic properties due to reversible surface relaxation. / Leng, Kai; Abdelwahab, Ibrahim; Verzhbitskiy, Ivan; Telychko, Mykola; Chu, Leiqiang; Fu, Wei; Chi, Xiao; Guo, Na; Chen, Zhihui; Chen, Zhongxin; Zhang, Chun; Xu, Qing Hua; Lu, Jiong; Chhowalla, Manish; Eda, Goki; Loh, Kian Ping.

In: Nature Materials, Vol. 17, No. 10, 01.10.2018, p. 908-914.

Research output: Contribution to journalArticle

Leng, K, Abdelwahab, I, Verzhbitskiy, I, Telychko, M, Chu, L, Fu, W, Chi, X, Guo, N, Chen, Z, Chen, Z, Zhang, C, Xu, QH, Lu, J, Chhowalla, M, Eda, G & Loh, KP 2018, 'Molecularly thin two-dimensional hybrid perovskites with tunable optoelectronic properties due to reversible surface relaxation', Nature Materials, vol. 17, no. 10, pp. 908-914. https://doi.org/10.1038/s41563-018-0164-8
Leng, Kai ; Abdelwahab, Ibrahim ; Verzhbitskiy, Ivan ; Telychko, Mykola ; Chu, Leiqiang ; Fu, Wei ; Chi, Xiao ; Guo, Na ; Chen, Zhihui ; Chen, Zhongxin ; Zhang, Chun ; Xu, Qing Hua ; Lu, Jiong ; Chhowalla, Manish ; Eda, Goki ; Loh, Kian Ping. / Molecularly thin two-dimensional hybrid perovskites with tunable optoelectronic properties due to reversible surface relaxation. In: Nature Materials. 2018 ; Vol. 17, No. 10. pp. 908-914.
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AU - Chu, Leiqiang

AU - Fu, Wei

AU - Chi, Xiao

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