Unfolding the mysterious roles of GeTe/SnTe compositing within CuInTe2 thermoelectric alloy: Short-range and local chemical orders
Source abstract
Abstract
The optimization of thermoelectric (TE) properties in TE materials requires controlling intrinsic factors such as order/disorder in crystal and chemical structures. Although heterogeneous interfaces play a key role in regulating TE properties, the corresponding atomic disorder-order has been ignored in composited systems. We demonstrate examples of GeTe/SnTe compositing for tuning CuInTe 2 TE properties. Evidences of increased short-range order and nanoclusters with local chemical order are presented via synchrotron X-ray pair distribution function and scanning transmission electron microscopy. Specifically, GeTe/SnTe compositing within CuInTe 2 enhances short-range order. Nanodomains of CuInTe 2(GeTe) x are accompanied by a significant atomic-intensity fluctuation that intensifies the scattering of phonons. In contrast to CuInTe 2(GeTe) x, nanoclusters with local chemical order are observed in CuInTe 2(SnTe) y, accompanied by a weak atomic-intensity fluctuation, which provides superior carrier transport channels and power factor for CuInTe 2(SnTe) 0.01. Ultimately, a maximum thermoelectric figure of merit zT of ∼1.0 is reported for CuInTe 2(SnTe) 0.01, which is 54 % greater than that of pristine CuInTe 2, and higher than the 0.86 for CuInTe 2(GeTe) 0.01. This work demonstrates new disorder-order insights that reveal the mysterious roles of compositing for tuning TE transport.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Chalcogenide Semiconductor Thin Films · Heusler alloys: electronic and magnetic properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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