Abstract

A infrared light trapping structure combining front subwavelength gratings and rear ZnO:Al nanoparticles for a PtSi Schottky-barrier detector over a 3–5 μm waveband is theoretically investigated. By selecting the proper plasmonic material and optimizing the parameters for the proposed structure, the absorption of the PtSi layer is dramatically improved. The theoretical results show that this improvement eventually translates into an equivalent external quantum efficiency (EQE) enhancement of 2.46 times at 3–3.6 μm and 2.38 times at 3.6–5 μm compared to conventional structures. This improvement in the EQE mainly lies in the increase of light path lengths within the PtSi layer by the subwavelength grating diffraction and nanoparticle-scattering effects.

© 2016 Chinese Laser Press

Enhancing near-infrared light absorption in PtSi thin films for Schottky barrier IR detectors using moth-eye surface structures

Federico Lora Gonzalez and Michael J. Gordon
Opt. Lett. 40(7) 1512-1515 (2015)

Room-temperature plasmonic mid-infrared photodetector based on PtSi/p-Si low Schottky-barrier junction

Masahiko Shiraishi, Daiji Noda, Ryo Ohta, and Tetsuo Kan
Appl. Opt. 61(14) 3987-3996 (2022)

Enhancing the external quantum efficiency of Schottky barrier photodetectors through thin copper films

Jongeun Seok, Yeonghoon Jin, and Kyoungsik Yu
Opt. Express 31(23) 38578-38588 (2023)

Enhanced photo-response properties of a single ZnO microwire photodetector by coupling effect between localized Schottky barriers and piezoelectric potential

Haixia Li, Xianghui Zhang, Nishuang Liu, Longwei Ding, Jiayou Tao, Siliang Wang, Jun Su, Luying Li, and Yihua Gao
Opt. Express 23(16) 21204-21212 (2015)

Responsivity enhancement of a PtSi photodetector with graphene by the photogating effect

Amir Hossein Mehrfar and Abdollah Eslami Majd
Appl. Opt. 62(5) 1160-1166 (2023)