Hydrothermal disproportionation of transition metal ions (Men), 2Men =Men+1 + Men-1, gave rise to the formation of so called excitonic solids, a new class of transition metal oxides consisting of the atomic-scale p-n junctions (Men-1-O-Men-O-Men+1) [1-3].Here we report the intrinsic electric and magnetic properties of the solids in the temperature range of 2-300 K and the supercurrent density of ca 105 Acm-2 at room temperature at the electric fields of 2-8 V.Our motivation of this work is to find highly efficient atomic-scale devices, e.g.metal oxide diodes, with the excited electrons and holes (excitons).The metal oxide diodes refer to the structural arrays there are already electrons from the conduction band of the solids and holes from doping Men+1, which are combined together as the ground state of the excitons.We propose the possible mechanism of the formation for the possible Bose condensation of electron pairs at room temperature.The creation of excitons by the separation of the combined electrons and holes at a given electric field (built-in field) was followed by the electron-exciton coupling into the Bose condensation responsible for the supercurrent density at room temperature.