Near-Melting-Point Annealed CuI Film

Dense, Continuous, UV-Responsive

This CuI film achieves dense and continuous morphology via near-melting-point annealing, overcoming porosity and discontinuity, and is ready for high-performance UV photodetectors.

Peijie, Qian · Lv, Yanfei · Xi, Junhua · Yujia, Lin · Li, Fu · Zhao, Shichao

Materials Letters 2026

Specifications

On-off ratio

{'zh': '11', 'en': '11'}

Rise time

{'zh': '156', 'en': '156'} ms

Fall time

{'zh': '21', 'en': '21'} ms

Responsivity

{'zh': '185', 'en': '185'} mA/W

Detectivity

{'zh': '1.12e11', 'en': '1.12e11'} Jones

Advantages

Dense and continuous film

Near-melting-point annealing eliminates pores and yields dense, continuous CuI films, facilitating carrier transport and device performance.

Fast response

The device exhibits rise/fall time of only 156/21 ms, suitable for fast detection.

Simple fabrication

Fabrication only requires copper iodination and annealing, without complex equipment.

Applications

• UV photodetectors：Directly use as the active layer in UV photodetectors, replacing conventional materials.
• flexible optoelectronics：The dense film can be integrated onto flexible substrates for wearable UV monitoring.
• biochemical sensing：The fast response enables real-time detection of UV-related signals in biochemical samples.
• precision measurement：High detectivity supports precise measurement of weak UV light.