Tanja C. Link

1 Introduction Perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) is an organic molecule consisting of a perylene core and carboxylic anhydride groups (Figure 1). Its π-conjugated system features delocalized π-electrons across the perylene framework, which stabilizes the molecule and enhances its unique electronic properties [1, 2]. PTCDA serves as a precursor for the synthesis of perylene diimide (PDI), which, like PTCDA, belongs to the rylene dye family.