Dual-Band Electrochromic Devices Utilizing Niobium Oxide Nanocrystals

16 February 2024, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


In this study we realize functioning electrochromic devices based on colloidal niobium oxide nanocrystals which show dual-band electrochromic behavior, with spectral selectivity between near-infrared and visible wavelengths. Minimally coloring vanadium oxide counter electrodes allow for full electrochromic devices that embody the dual-band electrochromic behavior of the niobium oxide component. The devices are fabricated using solution processing on both glass and flexible substrates, demonstrating that our platform has potential for the development of low-cost dual-band electrochromic devices for dynamic solar control in a variety of form factors and applications.


Colloidal Nanocrystals
Smart Window
Flexible Film
Solution Processing

Supplementary materials

Supporting Information
The supporting information includes the following: Descriptions of Tvis, TLum, TNIR, and SHGC; Electrochromism of vanadium oxide thin films; Electrochromic Performance of 10x10 cm2 device; Electrochromism of Nb12O29 NCs on ITO-coated PET substrate; Cycling performance of electrochromic device; Device performance comparison table; Cycling Stability Performance Metrics.


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