Correlating Structure and Detection Properties in HgTe Nanocrystal Films

• DOI: 10.1021/acs.nanolett.0c04346
• Publication Date: 2021-05-06T21:40:14Z
• Authors: Sang-Soo Chee; Charlie Gréboval; Debora Vale Magal...; Julien Ramade; Audrey Chu; Junling Qu; Prachi Rastogi; Adrien Khalili; Tung Huu Dang; Corentin Dabard; Yoann Prado; Gilles Patriarche; Julien Chaste; Michael Rosticher; Sara Bals; Christophe Delerue; Emmanuel Lhuillier
• Keywords: Tripod (photography); Sphere packing

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