NOVELTY - A lateral nanotube device comprises a substrate; an anodic oxide material (3); a column disposed in material extending from one distal to another end of the material; and first and second materials (4, 5) disposed within the column. The first material fills a distal end of the column and gradiently decreases towards another distal end of the column along inner walls of the column. The second material fills another distal end of the column and gradiently decreases towards the distal end of the column within the first material.    USE - As a lateral nanotube device comprising solar cell, light emitting diode, laser, electrostatic capacitor, battery and supercapcitor; and in system containing several lateral nanotube devices (claimed) useful for capturing, generating and storing electrical energy for integrating into power management circuitry.    ADVANTAGE - The lateral nanotube device provides enhanced functionality, including energy and power management systems and electrical power management circuitry with components to capture and generate energy, to store electrical energy, and to integrate these functions with power management circuitry. The nanotube device can produce a favorable energy capture per unit volume and per unit weight in solar cell devices.    DETAILED DESCRIPTION - A lateral nanotube device comprises a substrate; an anodic oxide material (3) disposed on the substrate; at least one column disposed in the anodic oxide material extending from one distal end of the anodic oxide material to another end of the anodic oxide material; and first and second materials (4, 5) disposed within the column. The first material fills a distal end of the column and gradiently decreases towards another distal end of the column along inner walls of the column. The second material fills another distal end of the column and gradiently decreases towards the distal end of the column within the first material. The two materials are concentrically disposed within the column. One of the materials comprises an electron donating material, and the other of the materials comprises an electron accepting material. The materials overlap at least 25% of a length of the column. The substrate is rigid or flexible. The lateral nanotube device further comprises a third material disposed between the first and second materials; first and second wiring structures connected to an exposed end of the first and second materials, respectively; and first and second conductive layers disposed on outer surfaces of the first and second materials, respectively. The first and second materials comprise n-type and p-type semiconductor materials. The anodic oxide material has a thickness of 25 nm to 1 millimeter. The third material comprises an electrical insulator. An INDEPENDENT CLAIM is included for preparation of the lateral nanotube device involving etching a passivation layer and an aluminum layer disposed on a substrate to expose portions of the aluminum layer; forming a pore at each distal end of an exposed portion of the aluminum layer such that the pores connect to form a single columnar pore; depositing a first material into a distal end of the columnar pore; depositing a second material into another distal end of the columnar pore, where the depositing the first material comprises filling the distal end of the columnar pore with the first material and gradiently decreasing towards the another distal end of the columnar pore along inner walls of the columnar pore, and the depositing the second material comprises filling the another distal end of the columnar pore with the second material and gradiently decreasing towards the distal end of the columnar pore within the first material.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view for materials within the solar cell nanodevice.    Anodic oxide material (3)    First material (4)    Second material (5)    First end of anodic oxide material (6)    Second end of anodic oxide material (7)