Minimizing 1/f Noise Through State-Resolved Delocalized Transport With HgTe Infrared Colloidal Quant
Abstract
Approved for Public Release Abstract: The work will evaluate two proposed conjectures on granular solids made of colloidal quantum, dots: (i) a higher conductance between quantum dots will reduce 1/f noise and a regime of delocalized electrons will minimize the 1,/f noise. (ii) A narrower size dispersion will increase the mobility and will provide the means to reach delocalized electrons by a,chieving electronic coherence between neighboring particles. The proposed material is HgTe colloidal quantum dot and it is compatibl,e with wafer scale sensitization of silicon CMOS chips for infrared imaging, which makes this particular system of relevance to the, Navy. The work will develop a synthesis of 10-20 nm diameter and monodispersed HgTe quantum dots with a goal of 3% size distributi,on. The size range will be suitable for MWIR or LWIR detector applications. The material size, shape, and dispersion will be charact,erized by electron microscopy and X-ray diffraction. Spectroscopy will be used to describe the quantum dot states, and the homogen,eous width/coherence of the states. The materials will be deposited as thin films. Different ligand exchange strategies will be u,sed to vary the electronic coupling between quantum dots by several orders of magnitude. Field-effect transistors will be measured f,rom room temperature to cryogenic temperatures to determine the nature of the transport, hopping or delocalized. Delocalized transp,ort will be most probable when the electronic coupling, the energy disorder and the state linewidth will be similar. 1/f noise will, be measured and related to the mobility and interdot conductance. The effect of contacts will be evaluated to ascertain if the noi,se is intrinsic to the film or the contacts. The project will support the training of graduate students and form the basis of PhD th,eses on synthetic advances and transport measurements.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Dec 10, 2021
- Source ID
- N000142212027
Entities
People
- Philippe Guyot-Sionnest
Organizations
- Office of Naval Research
- United States Navy
- University of Chicago