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The orders α of the curves (Jph ~ Iα) are 0.70, 0.90, 0.72, and 0.84 respectively for Ag-planar-inverted device at T = 300 K, Ag-grating-inverted device at T = 300 K, Ag-planar-inverted device at T = 270 K, and Ag-grating-inverted device at T = 270 K. The effective applied voltage is set to V0-V = 4.0 V.
