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Towards solving the heat concentration problem in power semiconductors, researchers have developed a highly efficient boiling immersion cooler using lotus metals. LTS succeeded in increasing the cooling performance from about 200 W/cm2 of the conventional cooler to 530 W/cm2 or more by using the boiling promotion technology using lotus metals. This technology is also considered as a highly efficient cooling technology for CPUs for conventional workstations and large-scale servers.