Perseverance of direct bandgap in multilayer 2D PbI 2 under an experimental strain up to 7.69%

Lena Du, Cong Wang, Wenqi Xiong, Shuai Zhang, Congxin Xia, Zhongming Wei, Jingbo Li, Sefaattin Tongay, Fengyou Yang, Xinzheng Zhang, Xinfeng Liu, Qian Liu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The two-dimensional (2D) materials are naturally suitable for various flexible 2D optoelectronic devices, in which the direct band gap perseverance is crucial because the flexibility deformations often cause a bandgap transition and thus break performance of the devices. Most of 2D transition metal dichalcogenides (TMDs) materials such as monolayer MoS 2 , WS 2 and MoSe 2 have been thought to be not suitable for flexible optoelectronic devices due to their direct-to-indirect bandgap transition even under a small strain (∼1%-2%) for any flexibility deformations. So far, only 2D phosphorene has been theoretically predicted to be able to keep direct bandgap property under a large strain. Here we report a 2D material lead iodide (PbI 2 ) mutilayer with a direct band gap and find by photoluminescence (PL) measurements that it maintains a direct bandgap nature under a large experimental strain up to 7.69%. Theoretical simulations support and explain well our experimental results.

Original languageEnglish (US)
Article number025014
Journal2D Materials
Volume6
Issue number2
DOIs
StatePublished - Feb 8 2019

Fingerprint

Multilayers
Energy gap
optoelectronic devices
flexibility
Electron transitions
Optoelectronic devices
iodides
transition metals
Iodides
photoluminescence
Transition metals
causes
Monolayers
Photoluminescence
Lead
simulation

ASJC Scopus subject areas

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

Cite this

Perseverance of direct bandgap in multilayer 2D PbI 2 under an experimental strain up to 7.69% . / Du, Lena; Wang, Cong; Xiong, Wenqi; Zhang, Shuai; Xia, Congxin; Wei, Zhongming; Li, Jingbo; Tongay, Sefaattin; Yang, Fengyou; Zhang, Xinzheng; Liu, Xinfeng; Liu, Qian.

In: 2D Materials, Vol. 6, No. 2, 025014, 08.02.2019.

Research output: Contribution to journalArticle

Du, L, Wang, C, Xiong, W, Zhang, S, Xia, C, Wei, Z, Li, J, Tongay, S, Yang, F, Zhang, X, Liu, X & Liu, Q 2019, ' Perseverance of direct bandgap in multilayer 2D PbI 2 under an experimental strain up to 7.69% ', 2D Materials, vol. 6, no. 2, 025014. https://doi.org/10.1088/2053-1583/ab01eb
Du, Lena ; Wang, Cong ; Xiong, Wenqi ; Zhang, Shuai ; Xia, Congxin ; Wei, Zhongming ; Li, Jingbo ; Tongay, Sefaattin ; Yang, Fengyou ; Zhang, Xinzheng ; Liu, Xinfeng ; Liu, Qian. / Perseverance of direct bandgap in multilayer 2D PbI 2 under an experimental strain up to 7.69% In: 2D Materials. 2019 ; Vol. 6, No. 2.
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AU - Xiong, Wenqi

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AU - Xia, Congxin

AU - Wei, Zhongming

AU - Li, Jingbo

AU - Tongay, Sefaattin

AU - Yang, Fengyou

AU - Zhang, Xinzheng

AU - Liu, Xinfeng

AU - Liu, Qian

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