Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.094
Publication date: 23rd September 2021
The wide spectral tunability of colloidal quantum dot (CQD) absorption, combined with good mobility of photogenerated charge carriers, make them competitive candidates for sensing wavelengths beyond the Si bandgap. I will present an overview of the latest achievements in CQD infrared photodetection fueled by advances in chemistry, materials science and device architectures. I will then touch on some of the remaining challenges, such as the realization of efficient infrared photodetectors that do not rely on heavy metals. I will present recent results on the use of InAs CQDs for infrared optoelectronics, showing how crucial surface management is in this materials family to achieve sufficient mobility, prevent heavy doping, and minimize surface defects – all aspects needed to enable photodetectors that combine high sensitivity (low dark current and noise, and high photoresponse) and fast operation.