We report on a GaN/AlGaN quantum cascade detector operating in the terahertz spectral range. The device was grown by metal organic chemical vapor deposition on a c-sapphire substrate and relies on polar GaN/AlGaN step quantum wells. The active region thickness is in micrometer range. The structural, electrical and optical investigations attest of high structural quality of the synthetized nitride material. The detector exhibits a peak photocurrent at 5.7 THz (23.6 meV) with a responsivity of 0.1 mA/W at 10 K under surface normal irradiation through a 10 um period grating. The photocurrent persists up to 20 K.
@article{arxiv.2204.07117,
title = {A 5.7 THz GaN/AlGaN quantum cascade detector based on polar step quantum wells},
author = {Patrick Quach and Arnaud Jollivet and Andrey Babichev and Nathalie Isac and Martina Morassi and Aristide Lemaitre and Pavel Yunin and Eric Frayssinet and Philippe de Mierry and Mathieu Jeannin and Adel Bousseksou and Raffaele Colombelli and Maria Tchernycheva and Yvon Cordier and François Julien},
journal= {arXiv preprint arXiv:2204.07117},
year = {2022}
}