For a deep dive into the physics of organic semiconductors , several authoritative texts and PDF resources are available that bridge the gap between molecular chemistry and solid-state physics. Key PDF Resources & Texts Physics of Organic Semiconductors (Brütting)
(Wiley-VCH): A detailed technical PDF focusing on the molecular orbital theory (HOMO/LUMO), the distinction between polymers and small molecules, and the electronic energy levels that govern these materials. physics of organic semiconductors pdf