Recently, Professor Min Qiu's research group has made a breakthrough in the field of perovskite-metal van der Waals contacts. The research of Yihan Lu, a 2021-grade PhD candidate, titled "Ice-assisted van der Waals Metal Contact with Halide Perovskites" has been successfully published in the journal Device . This paper details a novel ice-assisted van der Waals metal contact technology, which successfully addresses a major challenge in electrode integration of halide perovskite materials.

Due to the "soft lattice" characteristic of perovskites, traditional electrode deposition processes tend to introduce amounts of defects at the electrode-perovskite interface, severely impairing carrier transport. The team innovatively introduced water ice as a buffer layer, which effectively protects the perovskite surface during metal deposition. Through rewarming, the ice layer sublimes completely, enabling non-destructive contact between the metal electrode and perovskite.

Perovskite photodetectors fabricated based on this strategy have shown significantly improved performance: the dark current is as low as 69.7 pA at a bias voltage of 0.1 V, reducing by one order of magnitude compared to devices fabricated via traditional electrode integration methods. Meanwhile, under 450 nm blue light excitation, the device achieves an ultra-high on-off ratio of 2.4×10⁵ and maintains a high responsivity of 42.1 A/W under low-light conditions. This research provides a new approach for the development of high-performance perovskite optoelectronic devices.

Paper Link：https://www.cell.com/device/abstract/S2666-9986(25)00247-9