Absorption Modulation, Enhancement, and Narrowing Using Sub-Wavelength Gratings

Liu，Chenxi1; Tang，Haodong1; Liu，Haochen1; Sun，Xiao Wei1; Wu，Dan2; Wang，Kai1

10.1109/ICET55676.2022.9824791

2022

2768-6493

978-1-6654-8509-8

2022 IEEE 5th International Conference on Electronics Technology, ICET 2022

58-63

13-16 May 2022

Chengdu, China

The Sub-Wavelength Grating (SWG) has great potential to be used as a substrate in narrowband photodetectors of an adjustable detection range covered visible and near-infrared spectrum. By the combination of polycrystalline MAPbI3 perovskite material and a specially designed SWG substrate, the absorption spectrum of perovskite material at specific wavelengths within inherently weak band-edge absorption would be enhanced due to guided-mode resonance effect, resulting in a modulated, enhanced, and narrowed absorption of perovskite material. We designed different parameters of SWGs to evaluate the absorption of perovskite within the bandgap of perovskite. The influences of depth, periodicity and fill factor are systematically studied using finite-difference time-domain (FDTD) simulation method. Finally, we achieved a double enhancement of absorption at 780 nm for SWG-perovskite sample compared with planar counterpart at which wavelength normally negligible absorption is witnessed. Moreover, we fabricated the designed SWG substrate and successfully deposited and infiltrated polycrystalline MAPbI3 perovskite material on it.

FDTD narrowband photodetectors polycrystalline perovskite sub-wavelength grating

第一 ; 通讯

英语

EI

National Natural Science Foundation of China[61905107];

20223312574741

Absorption spectroscopy ; Diffraction gratings ; Finite difference time domain method ; Infrared devices ; Numerical models ; Photodetectors ; Photonics ; Photons

Minerals:482.2 ; Light/Optics:741.1 ; Optical Devices and Systems:741.3 ; Mathematics:921 ; Atomic and Molecular Physics:931.3

2-s2.0-85136334594

Scopus

1.Southern University of Science and Technology,Department of Electrical and Electronic Engineering,Shenzhen,China
2.Shenzhen Technology University,College of New Materials and New Energies,Shenzhen,China

Liu，Chenxi,Tang，Haodong,Liu，Haochen,et al. Absorption Modulation, Enhancement, and Narrowing Using Sub-Wavelength Gratings[C],2022:58-63.