TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The electronic circuit board is a silicon substrate. The electrode (A) is obtained from transparent conductor or semitransparent conductor. The transparent conductor is indium tin oxide or indium-zinc-oxide. The semitransparent conductor is a metal film obtained from silver, aluminum, titanium, nickel, copper, gold or chromium. The semiconductor layer is p-type semiconductor layer and n-type semiconductor layer, buffer layer with p-type semiconductor layer and n-type semiconductor layer, mixing layer of p-type semiconductor layer and n-type semiconductor layer, or mixing layer of p-type semiconductor layer and n-type semiconductor layer with p-type semiconductor layer and n-type semiconductor layer. The semiconductor nanoparticle is obtained from titanium oxide, cadmium selenide or cadmium sulfide. The electrode (B) is single layer structure or double-layer structure. The single layer structure is obtained from magnesium-gold alloy. The double-layer structure is obtained from lithium fluoride or calcium/aluminum.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The small molecule is chosen from pentacene, tetracene, hexabenzcoronene, phthalocyanine, porphyrine, pentacene derivative, tetracene derivative, hexabenzcoronene derivative, phthalocyanine derivative and/or porphyrine derivative. The n-type semiconductor layer is obtained from 60C or its derivatives, 70C or its derivatives, carbon nanotube or its derivatives, 3,4,9,10-perylene (tetracarboxylic-bis-benzimidazole), N,N'-dimethyl-3,4,9,10-perylenetetracarboxylic acid diimide or its derivatives, derivatives of 3,4,9,10-perylene (tetracarboxylic-bis-benzimidazole), polymer and semiconductor nanoparticles. The carbon nanotubes are multi-walled carbon nanotubes or single wall carbon nanotubes. The 60C derivative is phenyl 61C-butyric acid methyl ester.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The substrate is glass substrate, polymer plastic substrate or electronic circuit board. The polymer plastic substrate is obtained from polyethylene teraphthalate and polycarbonate. The conductive polymer is 3,4-polyethylenedioxythiophene-polystyrenesulfonate, polyaniline, polypyrrole or polyacetylene. The surfactant is poly(oxyethylene tridecyl ether). The p-type semiconductor layer is obtained from polythiophene, polyfluorene, polyphenylenevinylene, polythiophene derivative, polyfluorene derivative, polyphenylenevinylene derivative, conjugated oligomer or small molecules. The polythiophene derivative is poly(3-hexylthiophene). The polyfluorene derivative is poly(dioctylfluorene). The polyphenylenevinylene derivative is poly(2-methoxy-5-(2-ethyl-hexyloxy)-1,4-phenylene vinylene). The conjugated oligomer is sexithiophene. The polymer is poly(2,5,2',5'-tetrahexyloxy-7,8'-dicyano-di-p-phenylenevinylene) or poly(9,9'-dioctylfluorene-co-benzothiadiazole). The semiconductor layer is a mixing layer of poly(3-hexylthiophene) and phenyl 61C-butyric acid methyl ester.