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We have identified at least five different local breakdown mechanisms according to the temperature coefficient (TC) and slope of their characteristics and electroluminescence (EL) under reverse bias. These are (1) early pre-breakdown (strongly negative TC, low slope), (2) edge breakdown (positive TC, low slope, no EL), (3) weak defect-induced breakdown (zero or weakly negative TC, moderate slope,...
We present a comparison of large area pn-junction thermoelectric generators and classical thermoelectric modules. In contrast to conventional thermocouples, the thermal generation of carriers is explicitly used within the new device structures. The gradient of the pn-junction's built-in potential causes the separation of the thermally generated carriers. For the application of waste heat recovery,...
By using the low thermal conductivity of SiGe to increase the average temperature along the pn-junction of the structure, the efficiency and power output of our thermoelectric elements can be increased dramatically. Further improvement can be achieved by using optimized graded Ge content to fully adapt the temperature distribution to our needs
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