Abstract
The exotic transport physics of single-crystalline transition-metal pentatellurides has been debated for years. The authors discover that in fact polycrystalline samples show the same unusual properties, and that viewing these compounds as semiconductors with bipolar conduction explains their behavior. This insight allows for the prediction and optimization of their thermoelectric properties. Considering the dearth of work on materials for waste-heat recovery at lower temperatures, and on generators employing a single compound for both legs, this study could change the way we think about what is possible in thermoelectric applications.
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