NOVELTY - Electrically conductive, thermally curable composition comprises: electrically conductive particles comprising a core and a shell; and a curable polymer composition capable of being cured at less than or equal to 250 degrees C.    USE - The electrically conductive, thermally curable composition is useful: for forming an electrically conductive layer on a substrate; for forming electrically conductive member for layered assembly and photovoltaic device; and as conductive bus bars for solar cell (all claimed).    ADVANTAGE - The electrically conductive, thermally curable composition: provides the electrically conductive member that exhibits a contact resistivity of less than 20 ohm-cm2, and a volume resistivity of less than 75 milliohm/square/mil; utilizes the electrically conductive particles that offer low cost benefit with enhanced leach resistance; has excellent electrical conductivity and can be cured at low temperatures i.e. less than 250 degrees C; utilizes the polymer composition that is free from solvent, hence can be used in processing or manufacturing operations without solvent recovery concerns; and provides the solar cells and photovoltaic device having high power conversion efficiency.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) forming an electrically conductive layer on a substrate, comprising forming the electrically conductive, thermally curable composition, applying the composition on a substrate to a thickness of 1-100 mu m, and heating the applied composition to a temperature less than 250 degrees C to form an electrically conductive layer;    (2) a substrate having a thin layer of an electrically conductive polymeric material, where the material includes 70-92 wt.% of electrically conductive particles dispersed in a polymer matrix formed from thermally curing the curable polymer composition;    (3) a photovoltaic device comprising many layers, and an electrically conductive member, where the electrically conductive member is formed from a composition comprising the electrically conductive particles and a polymer matrix formed from thermally curing the curable polymer composition;    (4) a layered assembly (10) comprising a substrate (40), a layer of a transparent conducting oxide (20) on the substrate, and the electrically conductive member in electrical communication with the layer of transparent conducting oxide;    (5) a layered assembly comprising a silicon substrate, a layer of aluminum on the silicon substrate, and the electrically conductive member in electrical communication with the layer of aluminum;    (6) an electrically conductive, thermally curable composition comprising electrically conductive particles having a core-shell configuration, and fatty acid modified epoxy (meth)acrylate monomer(s) and (meth)acrylate monomer(s) or their oligomer(s); and    (7) a solar cell comprising either (a) p-type silicon substrate having an n-emitter disposed on its first side, (b) an aluminum-containing back contact layer disposed on its second side, (c) a passivation layer disposed over the n-emitter, (d) front silver-based contacts disposed on, or fired through, at least a portion of the passivation layer, and (e) many polymer based conductive bus bars disposed on the back contact layer, where the polymer based conductive bus bars comprise the electrically conductive, thermally curable composition, or (a1) an n-type silicon substrate having an n+ emitter disposed on its first side, (b1) a p+ aluminum-silicon containing back contact layer disposed on its second side, (c1) a passivation layer disposed over the emitter and the components (d) and (e) as above per se, or (a2) an aluminum back contact and (b2) at least one bus bar disposed on the back contact, where the bus bar contact is formed by curing the electrically conductive, thermally curable composition.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic cross-sectional view of the layered assembly.    Layered assembly (10)    Transparent conducting oxide layer (20)    Upper layer (30)    Substrate (40)    Lower layer (50)