Do you know if the new designs proposed using thermophotovoltaics and silicon-carbide pellets are more efficient than traditional RTGs in their use of plutonium

Do you know if the new designs proposed using thermophotovoltaics and silicon-carbide pellets are more efficient than traditional RTGs in their use of plutonium? Eli Yablonovitch mentions work being done at Berkely: https://www.youtube.com/watch?v=lDxJsa8miNQ&t=3280 https://www.youtube.com/watch?v=lDxJsa8miNQ&t=3280