Effective Diffusion Barrier Layer Achieves Thermal Stability for n-Type Bi2Te2.7Se0.3 Thermoelectric Generators

single-leg device and module for power generation were fabricated using Ti as the barrier layer between the thermoelectric materials and weldable Ni electrodes. The nearly unchanged output power and conversion efficiency after several thermal cycles and long-term stability measurements at a hot-side temperature of 495 K for 160 h robustly demonstrate the excellent thermal stability for these generators using Ti as a barrier layer.