The present disclosure is directed to optically-tuned electronic components including one or more layers of photosensitive semiconductive materials. In some embodiments, an optically-tuned electronic component includes a plurality of device layers have different bandgap characteristics. One or more selected layers can be optically activated (i.e. made substantially conductive) by illuminating at least a portion of each selected layer with illumination having a wavelength shorter than or substantially equal to the activation wavelength of each selected layer. Accordingly, various parameters can be tuned or a circuit can be switched between alternative paths by providing one or more selected wavelengths of illumination.