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Article Dans Une Revue Nano Letters Année : 2021

Correlating structure and detection properties in HgTe nanocrystal films

Sang-Soo Chee
Charlie Gréboval
Tung Huu Dang
Audrey Chu
Junling Qu
Adrien Khalili
Tung Huu Dang
Corentin Dabard
Yoann Prado
Julien Chaste

Résumé

HgTe nanocrystals (NCs) enable broadly tunable infrared absorption, now commonly used to design light sensors. This material tends to grow under multipodic shapes and does not present well-defined size distributions. Such point generates traps and reduces the particle packing, leading to a reduced mobility. It is thus highly desirable to comprehensively explore the effect of the shape on their performance. Here, we show, using a combination of electron tomography and tight binding simulations, that the charge dissociation is strong within HgTe NCs, but poorly shape dependent. Then, we design a dual-gate field-effect-transistor made of tripod HgTe NCs and use it to generate a planar p–n junction, offering more tunability than its vertical geometry counterpart. Interestingly, the performance of the tripods is higher than sphere ones, and this can be correlated with a stronger Te excess in the case of sphere shapes which is responsible for a higher hole trap density.
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Dates et versions

hal-03220006 , version 1 (06-05-2021)

Identifiants

Citer

Sang-Soo Chee, Charlie Gréboval, Debora Vale Magalhaes, Tung Huu Dang, Julien Ramade, et al.. Correlating structure and detection properties in HgTe nanocrystal films. Nano Letters, 2021, 21 (10), pp.4145-4151. ⟨10.1021/acs.nanolett.0c04346⟩. ⟨hal-03220006⟩
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