By changing the cubic silicon structure to a hexagonal nanowire structure, scientists managed to develop photon-based silicon alloy circuitry that may replace electron-based transistors. The photon-based material prevents electron traffic jams, overheating and transmission slowdowns caused by cramming too many transistors.
https://www.notebookcheck.net/Scientists-develop-photon-based-silicon-circuitry-that-could-make-Moore-s-Law-obsolete.461662.0.html
"Intel is planning to reach the 1 nm transistor size limit by the end of this decade"
You mean start using sub-14nm process by the end of decade? Looking at their delays and lack of progress they'd be lucky to offer all of their products on 7nm node by the end of this decade.