Assertion: impurity's effect | /r/HasProperty | 24⇓⇓–27
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text: On the other hand, power factors have also been enhanced via different approaches such as band engineering (19⇓⇓–22), inducing resonant levels (23), the carrier filtering effect (24⇓⇓–27), ionized impurity scattering (28), and modulation doping (29, 30).