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Tunable work function MXene electrodes enabled high-performance self-powered CsPbBr3 photodetector.

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Title: Tunable work function MXene electrodes enabled high-performance self-powered CsPbBr3 photodetector.
Authors: Yu, Xuewei1 (AUTHOR), Huang, Yuxing1 (AUTHOR), Li, Pengfan1 (AUTHOR), Jiang, Yanfeng1 (AUTHOR), Yu, Pingping1 (AUTHOR) pingpingyu@jiangnan.edu.cn
Source: Journal of Materials Science. May2026, Vol. 61 Issue 19, p13372-13389. 18p.
Subjects: Electrodes, Electron work function, Interfaces (Physical sciences), Electronic band structure, Photodetectors, Optoelectronic devices
Abstract: All-inorganic perovskite CsPbBr3 (CPB) has become an excellent choice for photoactive layers in high-performance photodetectors (PDs). However, energy band mismatch at the electrode–semiconductor interface limits its further performance improvements. MXene (Ti3C2Tx), with its tunable work function, offers a viable method to prepare high-performance photodetectors using surface functionalization. In this work, the work function of MXene electrodes is changed from 5.00 to 5.25 eV by surface functionalization using selenium (Se), copper (Cu), and polydopamine (PDA). The fabricated Ag-CPB-MXene@Cu PD demonstrated a maximum photocurrent of 8.54 × 10–10 A, a responsivity of 387.1 mA W−1, an on/off ratio of 610, an EQE of 170.8%, and a specific detectivity of 8.18 × 1012 Jones at 0 V bias and 500 nm. Comparing to the Ag-CPB-MXene PD, Ag-CPB-MXene@Cu PD shows notable gains of 3.78 times, 406 times, 3.42 times, and 136.9%, respectively. Additionally, an imaging system constructed based on the Ag-CPB-MXene@Cu PD successfully achieved high-resolution optical imaging. This work demonstrates that surface functionalization of MXene for tunable work function provides a new pathway to address interfacial band alignment challenges in optoelectronic devices, while also extending the potential applications of MXene in high-efficiency photoelectronic systems. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 192984077
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Tunable work function MXene electrodes enabled high-performance self-powered CsPbBr<subscript>3</subscript> photodetector.
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  Data: <searchLink fieldCode="AR" term="%22Yu%2C+Xuewei%22">Yu, Xuewei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Huang%2C+Yuxing%22">Huang, Yuxing</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Pengfan%22">Li, Pengfan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jiang%2C+Yanfeng%22">Jiang, Yanfeng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yu%2C+Pingping%22">Yu, Pingping</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> pingpingyu@jiangnan.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Materials+Science%22">Journal of Materials Science</searchLink>. May2026, Vol. 61 Issue 19, p13372-13389. 18p.
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  Data: <searchLink fieldCode="DE" term="%22Electrodes%22">Electrodes</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+work+function%22">Electron work function</searchLink><br /><searchLink fieldCode="DE" term="%22Interfaces+%28Physical+sciences%29%22">Interfaces (Physical sciences)</searchLink><br /><searchLink fieldCode="DE" term="%22Electronic+band+structure%22">Electronic band structure</searchLink><br /><searchLink fieldCode="DE" term="%22Photodetectors%22">Photodetectors</searchLink><br /><searchLink fieldCode="DE" term="%22Optoelectronic+devices%22">Optoelectronic devices</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: All-inorganic perovskite CsPbBr3 (CPB) has become an excellent choice for photoactive layers in high-performance photodetectors (PDs). However, energy band mismatch at the electrode–semiconductor interface limits its further performance improvements. MXene (Ti3C2Tx), with its tunable work function, offers a viable method to prepare high-performance photodetectors using surface functionalization. In this work, the work function of MXene electrodes is changed from 5.00 to 5.25 eV by surface functionalization using selenium (Se), copper (Cu), and polydopamine (PDA). The fabricated Ag-CPB-MXene@Cu PD demonstrated a maximum photocurrent of 8.54 × 10–10 A, a responsivity of 387.1 mA W−1, an on/off ratio of 610, an EQE of 170.8%, and a specific detectivity of 8.18 × 1012 Jones at 0 V bias and 500 nm. Comparing to the Ag-CPB-MXene PD, Ag-CPB-MXene@Cu PD shows notable gains of 3.78 times, 406 times, 3.42 times, and 136.9%, respectively. Additionally, an imaging system constructed based on the Ag-CPB-MXene@Cu PD successfully achieved high-resolution optical imaging. This work demonstrates that surface functionalization of MXene for tunable work function provides a new pathway to address interfacial band alignment challenges in optoelectronic devices, while also extending the potential applications of MXene in high-efficiency photoelectronic systems. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10853-026-12671-6
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      – Code: eng
        Text: English
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        PageCount: 18
        StartPage: 13372
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      – SubjectFull: Electrodes
        Type: general
      – SubjectFull: Electron work function
        Type: general
      – SubjectFull: Interfaces (Physical sciences)
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      – SubjectFull: Electronic band structure
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      – SubjectFull: Photodetectors
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      – SubjectFull: Optoelectronic devices
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    Titles:
      – TitleFull: Tunable work function MXene electrodes enabled high-performance self-powered CsPbBr3 photodetector.
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            NameFull: Yu, Xuewei
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            NameFull: Huang, Yuxing
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            NameFull: Li, Pengfan
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            NameFull: Jiang, Yanfeng
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            NameFull: Yu, Pingping
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              M: 05
              Text: May2026
              Type: published
              Y: 2026
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