Thermoelectric power generation is based on seebeck effect that was discovered in 1821. From the temperature difference of hot and cold side, we can harvest the electrical energy. To enhance the efficiency of thermoelectric generator, there are two key factors, which is temperature difference (ΔT) and dimensionless figure of merit (ZT). Temperature difference ΔT is system factor of thermoelectric generator that drives the charge carriers from hot side to cold side. Dimensionless figure of merit (ZT) is materials’s intrinsic properties that consists of three parameters (electrical conductivity, seebeck coefficient, thermal conductivity)
Simulation of dispenser printed thermoelectric generator
- Wearable thermoelectric generator especially uses the human body heat to make temperature differences to generator electricity.
- Fabrication process was done by dispenser printing that is easy, fast and cost effective.
(Application in Flexible substrate)
(printed thermoelectric generator design)
Wearable thermoelectric generator with dispenser printing
2. Wearable Thermoelectric Generator
Ti/MgF2 optimum structure calculation
- Metal layers of less than one skin depth (e.g., several nanometers) allow for partial transparency.
- A particular range of wavelengths of incident solar energy can experience enhanced absorption caused by multiple reflections at layer interfaces.
- The basic concept that this simple multilayer structure can profoundly modify optical properties.
Emission spectrum of each layer calculated at Troom
Effect of multiple reflections
1. Solar Absorber Technology
Multilayer Absorber - selective solar absorbers
- Dielectric layers increase the absorption in the visible region.
- Metal layers suppress thermal emission in the IR range
- Multilayer absorbers Metal layers effectively reduce the reflectance in the IR region