title: 25th anniversary article: progress in chemistry and applications of functional indigos for organic electronics.
abstract: Indigo and its derivatives are dyes and pigments with a long and distinguished history in organic chemistry. Recently, applications of this 'old' structure as a functional organic building block for organic electronics applications have renewed interest in these molecules and their remarkable chemical and physical properties. Natural-origin indigos have been processed in fully bio-compatible field effect transistors, operating with ambipolar mobilities up to 0.5 cm(2) /Vs and air-stability. The synthetic derivative isoindigo has emerged as one of the most successful building-blocks for semiconducting polymers for plastic solar cells with efficiencies > 5%. Another isomer of indigo, epindolidione, has also been shown to be one of the best reported organic transistor materials in terms of mobility (∼2 cm(2) /Vs) and stability. This progress report aims to review very recent applications of indigoids in organic electronics, but especially to logically bridge together the hereto independent research directions on indigo, isoindigo, and other materials inspired by historical dye chemistry: a field which was the root of the development of modern chemistry in the first place.
authors.affiliation: Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, Johannes Kepler University, Linz, Austria.
authors.forename: Eric Daniel
authors.initials: ED
authors.lastname: Głowacki
authors.forename: Gundula
authors.initials: G
authors.lastname: Voss
authors.forename: Niyazi Serdar
authors.initials: NS
authors.lastname: Sariciftci
mesh_terms: D000846:Anniversaries and Special Events; D001672:Biocompatible Materials / Q000737:chemistry; D004396:Coloring Agents / Q000737:chemistry / Q000378:metabolism; D007203:Indigo Carmine / Q000737:chemistry* / Q000378:metabolism; D029883:Indigofera / Q000737:chemistry / Q000378:metabolism; D007211:Indoles / Q000138:chemical synthesis / Q000737:chemistry; D008968:Molecular Conformation; D011108:Polymers / Q000737:chemistry; D012666:Semiconductors; D012993:Solar Energy
chemical_list: D001672:Biocompatible Materials; D004396:Coloring Agents; D007211:Indoles; D011108:Polymers; D007203:Indigo Carmine
keywords: dyes and pigments; materials chemistry; natural products; organic electronics