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<p>Single quantum well (single-QW) two-dimensional (2D) perovskites are set to transform optoelectronic devices due to their stability and superior properties. However, solution-processed 2D perovskites often form disordered multiple-QW structures, leading to inconsistent performance. Here, we present a solvent-hydrolysis-driven method for controlling crystallization kinetics, resulting in highly ordered single-QW 2D perovskite films. Dimethylamine (DMA), formed from the hydrolysis of <i>N</i>,<i>N</i>-dimethylformamide (DMF), acts as a key mediator, preventing cluster aggregation and ensuring uniform colloidal distribution. This process avoids a heterogeneous intermediate phase, thereby fostering the formation of a homogeneous (DMA,MA)PbI<sub>3</sub> phase, which is crucial for the development of single-QW films. The resulting photodetector demonstrates outstanding performance, with a responsivity of 1153 mA/W and a detectivity of 6.98 × 10<sup>12</sup> Jones, along with excellent photostability under ambient conditions. These attributes make it ideal for photoelectric imaging sensors and large-scale integration. Our findings provide a scalable, solution-processed strategy for high-performance 2D perovskite materials, opening up new possibilities for advanced optoelectronic applications.</p>

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Solvent-hydrolysis-driven engineering of ordered single quantum well 2D perovskites

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月14日

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  • Siliang Hu,
  • Weijun Wang,
  • Dongchang He,
  • Yi Shen,
  • Da Xiong,
  • Yunfan Wang,
  • Haifan Li,
  • Boxiang Gao,
  • Mengxue Chen,
  • Shuai Zhang,
  • Dylan Xiangyu Fan,
  • Zhengxun Lai,
  • Sai-Wing Tsang,
  • Chun-Yuen Wong,
  • Johnny C. Ho

摘要

Single quantum well (single-QW) two-dimensional (2D) perovskites are set to transform optoelectronic devices due to their stability and superior properties. However, solution-processed 2D perovskites often form disordered multiple-QW structures, leading to inconsistent performance. Here, we present a solvent-hydrolysis-driven method for controlling crystallization kinetics, resulting in highly ordered single-QW 2D perovskite films. Dimethylamine (DMA), formed from the hydrolysis of N,N-dimethylformamide (DMF), acts as a key mediator, preventing cluster aggregation and ensuring uniform colloidal distribution. This process avoids a heterogeneous intermediate phase, thereby fostering the formation of a homogeneous (DMA,MA)PbI3 phase, which is crucial for the development of single-QW films. The resulting photodetector demonstrates outstanding performance, with a responsivity of 1153 mA/W and a detectivity of 6.98 × 1012 Jones, along with excellent photostability under ambient conditions. These attributes make it ideal for photoelectric imaging sensors and large-scale integration. Our findings provide a scalable, solution-processed strategy for high-performance 2D perovskite materials, opening up new possibilities for advanced optoelectronic applications.