Table 1 Comparison of spontaneous polarization reported for WZ III-nitride semiconductors

Local polarization

measurements

Electrical

measurements^34,39,40

Ref. ZB^1,16,21,38

Ref. LH^21,25,41

AlN

1.37^a

1.40

−0.081 to −0.090

1.339–1.351

GaN

1.29^a

−0.022 to −0.035

1.299–1.312

InN

1.04^a

−0.032 to −0.053

1.026–1.032

ScAlN

0.5–1.5

−0.089 to −0.296

1.35–1.00

ScAlN^a

1.34–1.43 ⁽ⁱ⁾

1.48 ⁽ⁱ⁾

1.37–1.15 ⁽ⁱⁱ⁾