Miniature spectrometer based on graded bandgap perovskite filter
Sun Peihan,
Hu Xiangmin,
Yuan Shuhao,
Peng Yanyan,
Xu Tingfa,
Zhong Haizheng
Affiliations
Sun Peihan
MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Materials Science and Engineering, 47833Beijing Institute of Technology, Beijing, 100081, China
Hu Xiangmin
School of Optics and Photonics, 47833Beijing Institute of Technology, Beijing, 100081, China
Yuan Shuhao
CT Corporation Services LLC, Abu Dhabi, 20000, UAE
Peng Yanyan
School of Optics and Photonics, 47833Beijing Institute of Technology, Beijing, 100081, China
Xu Tingfa
School of Optics and Photonics, 47833Beijing Institute of Technology, Beijing, 100081, China
Zhong Haizheng
MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Materials Science and Engineering, 47833Beijing Institute of Technology, Beijing, 100081, China
Miniature spectrometer is powerful tool for scientific research and industrial inspection. Here, we report the fabrication of graded perovskite filters with tunable bandgap and their application in constructing miniature spectrometer. The graded perovskite filters were fabricated using a Finkelstein reaction between in-situ formed halogen ion with a preformed MAPbX3 film. The graded bandgap of perovskite films can be well tunned from 400 to 750 nm by controlling the volume ratio between 5,5-dimethyl-1-pyrroline N-oxide and benzyl chloride(bromide). By combining a deep residual network, graded bandgap perovskite film and commercial CMOS sensor chip, a miniature spectrometer is demonstrated, achieving an accurate spectrum reconstruction (PSNR = 40.749) with monochromatic spectral resolution of 1.31 nm.
