Effect of Doping on the Thermochromic Performance of VO2

This chapter aims to elaborate the roles of the dopants in tailoring the thermochromic performance of vanadium dioxide (VO₂). It illustrates the role of dopants in tailoring the thermochromic performance of VO₂ both by experimental investigations and theoretical simulations, which will help the authors to understand the doping effect in depth. After Sb doping, both VO₂(R) and VO₂(M) exhibit an increase in the absorption coefficient. For the reflectivity spectra, one can see that the reflectance decreased after Sb doping. Different from the atomic substitution in doping with metallic cations, hydrogen doping is done in order to insert protons into the center of the open channels in the lattice of VO₂. When the doping element serves as the donor or acceptor in VO₂, it injects its electrons or holes into the electronic structure of VO₂, which increases the carrier concentration in the system.