Citation: Xixi Pang, Yingtao Zhao, Xiangxiang Gao, Guoqi Wang, Hao Sun, Jun Yin, Jian Zhu. Two-step colloidal synthesis of micron-scale Bi₂O₂Se nanosheets and their electrostatic assembly for thin-film photodetectors with fast response[J]. Chinese Chemical Letters, ;2021, 32(10): 3099-3104. doi: 10.1016/j.cclet.2021.03.039 shu

Two-step colloidal synthesis of micron-scale Bi₂O₂Se nanosheets and their electrostatic assembly for thin-film photodetectors with fast response

Xixi Pang ^{a, b} ,
Yingtao Zhao ^{a, b} ,
Xiangxiang Gao ^{a, b} ,
Guoqi Wang ^{a, b} ,
Hao Sun ^{a, b} ,
Jun Yin ^{a, b, *,} ,
Jian Zhu ^{a, b, c, *,}

a.
School of Materials Science and Engineering, Nankai University, Tianjin 300350, China
b.
National Institute for Advanced Materials, Nankai University, Tianjin 300350, China
c.
Tianjin Key Laboratory for Rare Earth Materials and Applications, Nankai University, Tianjin 300350, China

yinj@nankai.edu.cn

zj@nankai.edu.cn

Received Date: 23 February 2021
Revised Date: 10 March 2021
Accepted Date: 11 March 2021
Available Online: 17 March 2021

Figures(5)

Recently discovered bismuth oxychalcogenide (Bi₂O₂Se) has aroused great interest due to its ultrahigh carrier mobility, tunable band gap and good environmental stability, making it a promising candidate for high-performance electronics and optoelectronics. Their synthesis by colloidal approaches represents a cost-effective alternative to well-established chemical vapor deposition methods, and the resulting electronic-grade inks are important for large-area printed or wearable electronics. However, it is still challenging to control the colloidal growth of Bi₂O₂Se nanosheets in solution in addition to their assembly into high-performance thin films. Here, we report a two-step colloidal synthesis of Bi₂O₂Se nanosheets by separating the seeding and growth steps, thereby achieving controllable production of nanosheets with a lateral size of 1.4 μm and a thickness of 10 nm at optimized reaction conditions. These Bi₂O₂Se nanosheets are electrostatically assembled into large-area thin films, from which a photodetector is fabricated with a responsivity of 6.1 A/W and a short response time of 368 μs under the 520-nm laser illumination. The device exhibits fast response to modulations as high as 100 kHz, along with a −3 dB bandwidth of 1 kHz. This work provides an important understanding of the controlled colloidal synthesis of Bi₂O₂Se nanosheets, and demonstrates their potential applications in fast photodetectors.
- Bi₂O₂Se nanosheets,
- Colloidal synthesis,
- Electrostatic assembly,
- Photodetectors,
- Solution-processed electronics
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Two-step colloidal synthesis of micron-scale Bi2O2Se nanosheets and their electrostatic assembly for thin-film photodetectors with fast response

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通讯作者: 陈斌, bchen63@163.com

Two-step colloidal synthesis of micron-scale Bi₂O₂Se nanosheets and their electrostatic assembly for thin-film photodetectors with fast response