NOVELTY - Fabrication of electron tunneling device on a substrate comprises: (i) forming a first non-insulating layer on the substrate; (ii) providing first amorphous layer and second layer; (iii) forming a second non-insulating layer; and (iv) providing an antenna structure. The second layer of material is configured to cooperate with the first amorphous layer such that the first amorphous layer and second layer of material together serve as a transport of electrons.    USE - For fabricating an electron tunneling device for solar energy conversion.    ADVANTAGE - The electron tunneling device has increased performance and manufacturability. The inclusion of second layer results in increased degrees of nonlinearity and asymmetry over and above the given degree of non-linearity and asymmetry while the differential resistance is reduced, with respect to the given voltage. The increase in nonlinearity and asymmetry and reduction in differential resistance is achieved without resorting to the use of epitaxial growth techniques or crystalline layers.    DETAILED DESCRIPTION - Manufacture of electron tunneling device on a substrate comprises:    (a) forming a first non-insulating layer (112) on the substrate;    (b) providing first amorphous layer (116) and second layer (118);    (c) forming a second non-insulating layer (114); and    (d) providing an antenna structure connected with the two non-insulating layers.    The second layer of material is configured to cooperate with the first amorphous layer such that the first amorphous layer and second layer of material together serve as a transport of electrons between and to insulating layers. The transport of electrons includes, at least in part, transport by tunneling.    DESCRIPTION OF DRAWING(S) - The figures are diagrammatic illustration of an electron tunneling device, and graph illustrating the schematic energy band profile of the electron tunneling device.    Non-insulating layers (112, 114)    First amorphous layer (116)    Second layer (118)    Energy band profile (120)