A Single-Dot Perovskite Spectrometer

Linqi Guo, Haoxuan Sun,* Min Wang, Meng Wang, Liangliang Min, Fengren Cao, Wei Tian, and Liang Li*

Adv. Mater. 2022, 34, 2200221

https://doi.org/10.1002/adma.202200221

There are significant applications for miniature on-chip spectrometers in many fields. However, at present, on-chip spectrometers have to utilize an integrated strategy to achieve spectral analysis, which undoubtedly squanders the photosensitive area and adds pressure to the miniaturization of the spectrometer. Here, a unique spectrometer design that adopts a single detection point with in situ modulation realized by the photogain control at various bias voltages is demonstrated. With micrometer-level footprints, this single-dot spectrometer processes a resolution of about 5 nm and a response time down to about 197 µs. This is the first in situ perovskite modulation strategy that breaks the footprint-resolution restriction of spectrum analysis and demonstrates a new design direction for functional perovskite devices.