物理文献翻译（制备zno薄膜）The co-planar evaporated Al electrodes were v

物理文献翻译（制备zno薄膜）
The co-planar evaporated Al electrodes were verified to yield ohmic behaviour.
The spectral dependence of α exhibits two regions: a power law one at high photon energies and an exponential one at lower energies.
第二句 里的spectral dependence是什么?
需要前两句的译文