A new solar thermoelectric device is in the offing- and what’s cool is that it can be retrofit into existing solar water heaters to gain the benefits. This means the payback for adding the device is amplified. Dr. Gang Chen and ZhiFeng Ren and twelve colleagues and doctoral students (MIT, Boston College, GMZ Energy (founded by the primary authors), and Masdar Institute of Abu Dhabi), published these results in Nature Materials.