The present invention proposes a novel method to fabricate a Bipolar Junction Transistor device. The solar array has a plurality of solar modules, each module having at least one DCDC converter for converting the raw panel output to an optimized high voltage, low current output. The attachment portion can contain a plurality of apertures provided therein which sequentially become more elongated as they are positioned toward a side edge of the attachment portion in order to deal with thermal expansion and contraction of the panel. The conductive reflective film provides improved adhesion properties with respect to a base material while maintaining a high reflectivity and a high conductivity of a silver nanoparticle-sintered film. A method for detecting a target nucleic acid using a said compound is described. The electronic component is mounted in the opening and is electrically connected to the non-cavity layer exposed through the opening.