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<p>All-inorganic perovskite CsPbBr<sub>3</sub> (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 (Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>), 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&#xa0;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<sup>–10</sup>&#xa0;A, a responsivity of 387.1&#xa0;mA&#xa0;W<sup>−1</sup>, an on/off ratio of 610, an EQE of 170.8%, and a specific detectivity of 8.18 × 10<sup>12</sup>&#xa0;Jones at 0&#xa0;V bias and 500&#xa0;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.</p>

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

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Xuewei Yu,
  • Yuxing Huang,
  • Pengfan Li,
  • Yanfeng Jiang,
  • Pingping Yu

摘要

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.