Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.043
Publication date: 7th February 2022
During the past decade, nanocrystals (NCs) have shown that they were an efficient and low-cost photodetection technology to address the infrared range. In particular, in the short-wave infrared by using interband transitions in narrow band gap semiconductors such as HgTe NCs [1]. Here, to go beyond and access the mid-wave infrared range, we use an interesting alternative that are intraband transitions of HgSe doped NCs [2][3]. Throughout a dye sensitized approach which couples an intraband absorber to an undoped material driving the charge conduction, the limitations observed from intraband materials (high dark current, slow response, and low activation energy) are ruled out [3]. Using mid-infrared transient reflectivity (TR) measurement, we unveil the coupling between both material in this heterostructure. The latter displays a unique feature in the TR signal which dynamic matches the hopping time and therefore is an evidence of a charge transfer. Moreover, we develop a strategy to enhance the hybrid material’s photodetection performance by coupling it to an optical nano-resonator. Finally, we demonstrate that the final structure has an enhanced absorption of a factor 4 allowing for an 80 K increase of the operating temperature. The resulting device has among the highest intraband-based photodetection performances.
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