TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation (claimed): Preparation of (A) comprises forming (II) on a growth substrate; forming active layer by linking (III) with (II); and placing the active layer between two electrodes. Preferred Process: In the process, formation of (II) is obtained by: filling a nanoporous membrane, laid on a silicon growth substrate and covered with gold; chemical deposit in vapor phase, which is facilitated by plasma; and microwave or radio frequency plasma deposit. In the process, formation of (II) is obtained by: depositing a layer of gold (having a thickness of 1nm) on growth substrate covered with a layer of transparent conducting oxide or conducting oxide; annealing the covered growth substrate to form a layer of gold; and chemically dissolving the gold after the growth of (II), on an aggregate layer of gold. In the process; removal of the (II) after their growth; removed (II) are solubilized after functionalization in (III) (which is a polymer); and deposition of the active layer of (A) on a substrate of a device covered with a layer forming the first electrode. The mixture is deposited by coating (centrifugal or laminar). (II) are formed on the layer of tin doped indium oxide (ITO) (which are covered with a layer of small molecules obtained by evaporation under vacuum) forming the first electrode, which are impregnated with (III) after functionalization to form the active layer.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: (III) (which is a small molecule) is a conjugated polymer (polyaniline, polypyrrole, polyacetylene, polyparaphenylene, polyparaphenylenevinylene or its derivatives, poly-paraphenylene sulfide, polyisothionaphthalene, polyheptadiene, poly(3,4-ethylenedioxythiophene) or its family, polysquaraines, polyfluorene, polythiophene or its derivatives, polyfluorenone or their derivatives or polythienylenevinylene or their derivatives); and phtalocyanine, porphyrine, chlorophyll, perylene, pentacene, tetracene and their optionally substituted polyene derivatives, merocyanine, naphtalocyanine, quinacridone and/or their derivatives. (I) is silicon or germanium. (I) is doped n or doped p. The diameter of (II) is lower than 100 (preferably lower than 10) nm. (II) are functionalized by a treatment surface. The growth substrate (silicon) is a glass substrate in which a layer of transparent conducting oxide is deposited; or substrate of a device.