Transparent heat mirrors can be constructed from single- or multi-layer coatings. For single-layer mirrors wide-band-gap semiconductors are the best available materials. The required fundamental semiconductor properties are reviewed and experimental data of binary and ternary compounds discussed.
"Materials For Transparent Heat Mirror Coatings", Proc. SPIE 0324, Optical Coatings for Energy Efficiency and Solar Applications, (12 April 1982); doi: 10.1117/12.933248; https://doi.org/10.1117/12.933248