In a new Invited Review in Synthetic Metals [Syn. Met., 288 (2022) 11710], Noguchi et al. offer a new and comprehensive perspective on the role of spontaneous polarization in organic semiconductor thin films, as well as a discussion of its impact on device design and performance.
Spontaneous orientation polarization (SOP) arises as a result of the preferential orientation of molecular permanent electric dipole moments leading to the formation of a polarization field. This polarization can be large enough to significantly impact charge injection and exciton behavior in organic semiconductor thin films.
Noguchi et al. review how the field’s understanding of SOP has evolved over the last two decades (and continues to evolve), while also discussing important implications for the operation of organic light-emitting devices (OLEDs), of ubiquitous application in displays.
This Invited Review also offers a useful perspective on the potential role of SOP in the realization of novel vibrational energy harvesting devices, based on electrets. This work will be of significant interest to the broad community of researchers working on the development of novel organic semiconductor materials, methods for their processing, and applications in electronic and optoelectronic devices.
See the paper (Open Access for 6 months) here: https://www.sciencedirect.com/science/article/pii/S0379677922000959