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This lecture covers the fundamental concepts of solitons in organic electronics, focusing on the formation, properties, and behavior of solitons in poly(acetylene). Topics include the Peierls instability, degenerate ground states, neutral solitons, the SSH model, chemical doping effects, and the transition of solitons to charged carriers. The instructor discusses the impact of chemical doping on the conductivity of poly(acetylene) and the formation of charged solitons supported by theoretical models and experimental evidence.