Perovskite lasers, a long-sought but highly challenging solution for building tiny lasers integrated into silicon chips, have seen a major breakthrough in research from Zhejiang University.
A new paper reports unprecedented near-continuous operation, marking a significant step forward for the technology and culminating in a practical device that demonstrates real-world promise. By addressing a long-standing issue with perovskite, the team has opened a new path to miniaturized on-chip lasers.
Semiconductor Problems
Access to semiconductors has been a major issue in global technology supply chains for years. III-V semiconductors—made of elements from groups III and V of the periodic table, such as indium, arsenic, and gallium—are widely used in commercial lasers.
However, these semiconductors require specialized substrates for growth, making production and integration with silicon technology difficult. To overcome these barriers, engineers have searched for new ways to produce efficient miniaturized lasers that can be integrated directly onto silicon chips, enabling faster computing and optical communication speeds.
All-inorganic perovskite films have long been seen as promising, given their low cost, compatibility with a variety of substrates, and strong optical properties. Yet they suffer from the same major obstacle holding back other next-generation technologies, such as quantum computing: reliable performance at room temperature. Specifically, Auger recombination causes perovskite lasers to quickly lose charge carriers at room temperature, preventing continuous operation.
Solving Perovskite Lasers
The Zhejiang University team achieved near-continuous perovskite laser operation with a simple modification to the production process. Their method introduces a volatile ammonium additive during annealing, which creates the polycrystalline perovskite films used for laser lenses. The additive induces phase reconstruction, removing low-dimensional phases that accelerate Auger recombination.
Those low-dimensional phases accelerate the Auger recombination, and by reducing these phases, the unwanted effect is greatly diminished. The resulting pure 3D crystalline structure features lower optical loss while preserving the charge carriers needed for lasing.
To understand the improved performance, the researchers examined how electrons and holes recombine under different pumping conditions. In Auger recombination, energy from electron-hole pair recombination is transferred to another carrier rather than emitted as light.
Continuous beams and longer pulses typically worsen the problem, as carrier injection occurs at a duration close to—or exceeding—the Auger lifetime. This rapid carrier loss prevents the population inversion required for lasing. By minimizing the Auger effect, the team was able to sustain the carrier densities needed for efficient stimulated emission.
Building a Functional Laser
For their research, the team constructed a functional laser device utilizing one of their ammonium-added perovskite lenses in the form of a single-mode vertical-cavity surface-emitting laser (VCSEL). Their VCSEL achieved performance measurements of a low 17.3 μJ/cm² lasing threshold coupled with a quality factor of 3850 under quasi-continuous nanosecond pumping. These numbers represent the strongest performance for a perovskite laser ever recorded.
These results demonstrate a viable path to manufacturing effective perovskite lasers. Such devices could eventually operate under highly desirable continuous-wave or electrically driven conditions, two key benchmarks for integration into photonic chips.
Additionally, the team’s findings may also pave the way toward flexible or wearable optoelectronic applications in the years ahead.
The paper, “Volatile Ammonium-Driven Perovskite Phase Reconstruction for High-Performance Quasi-CW Lasing,” appeared in Advanced Photonics on August 19, 2025.
Ryan Whalen covers science and technology for The Debrief. He holds an MA in History and a Master of Library and Information Science with a certificate in Data Science. He can be contacted at ryan@thedebrief.org, and follow him on Twitter @mdntwvlf.