According
to the innovative design concept of omnidirectional quasi-order
hetero-nanocomposites proposed for potentially realizing high thermoelectric
performance, a series of superarchitectures consisting of longitudinally
periodic diamond-like carbon (DLC) interlayers in latitudinally well-aligned
Bi–Sb–Te (BST)-based nanostructures were successfully
demonstrated for the first time using dual-beam pulsed laser deposition.
This work confirmed that the periodic appearance of DLC is a practical
approach to instantly resetting the BST deposition into another new
crystal growth cycle. The optimized Seebeck coefficient of ∼500
μV K–1 and the corresponding power factor
of ∼40 μW cm–1 K–2 achieved are comparable to or higher than the reported values for
BST or BST-based nanocomposites, which evidently originated from the
periodically added DLC, as clarified in the Pisarenko plot. In addition,
the DLC additives effectively reduce the thermal transport as qualitatively
evidenced by micro-Raman characterizations.
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