Photoactive Compounds Based on the Thiazolo[5,4‐d]thiazole Core and Their Application in Organic and Hybrid Photovoltaics

Abstract Thiazolo[5,4‐ d ]thiazoles (TzTzs) are fused bicyclic heteroaromatic compounds characterized by a rigid planar backbone and an extended π‐conjugated electronic structure. Although they have been known for many decades, interest in their properties and applications has begun to increase only recently, after their incorporation into a series of active materials used in the field of organic electronics. Recently, the thiazolo[5,4‐ d ]thiazole scaffold has been inserted into new photoactive compounds (both small‐molecule compounds and polymers) used to build bulk‐heterojunction organic solar cells (OSCs), as well as in new organic π dyes for dye‐sensitized solar cells (DSSCs). This microreview focuses on the preparation of such TzTz‐containing materials and their application in the field of organic and hybrid photovoltaics.