Molecular structure – electrical performance relationship for OFET-based memory elements comprising photochromic component

A series of photochromic diarylethenes with different bridge moieties have been investigated as light-sensitive components of photoswitchable organic field-effect transistors. It was shown that the presence of carbonyl group and its position in the bridge part of the diarylethene molecule affects strongly the electrical performance and stability of the devices. In particular, compounds with carbonyl groups revealed stronger light-induced switching effects (wider memory windows), while the stability of the formed electrical states was very modest. On the contrary, devices possessing non-polar cyclopentene bridge required longer time for switching, while the induced electrical states demonstrated excellent stability required for memory cells. The established molecular structure – device performance relationship and revealed device operation mechanisms should facilitate a rational design of new materials for advanced optical memories thus paving a way towards their practical implementation.