The second is to choose a thermoelectric material which conducts heat badly (so that different parts remain at different temperatures) but electricity well.
And as you may have guessed, diamond conducts heat even better than graphite because each atom spreads that energy in three directions rather than two.
It's 200 times stronger than steel by weight, lighter than paper, it's super-flexible and the most conductive material of both electricity and heat ever discovered.
78. Question: How can we improve the thermal conductivity of a PCB in PCBA? Answer: By using materials with high thermal conductivity, adding thermal vias, or incorporating heat - spreaders.