Electrical conditioning of conjugated polyelectrolytes for cathode interfacial layer engineering of solution-processable optoelectronic devices

The development of conjugated polyelectrolytes as cathode interfacial material (CIM) has significantly affected the performance of OLEDs and OPVs. We have designed, synthesized and tested a family of CIMs comprising a fluorene-based backbone with pendant polar or ionic groups, which increase alcohol/water solubility, hence providing a more environmentally friendly option to manufacture solution-processed multilayer devices by using orthogonal solvents. We have recently shown that the insertion of a CIM layer significantly improves the performance of hybrid LEDs highlighting the crucial role of the interfacial layer polarization. Starting from that basis, in this work contribution we investigate on the behaviour of compare the effect of the same CIMs in different kinds of optoelectronic devices, by comparing their effect on OLEDs and OPVs functioning. In particular we focus this study on the effectinfluence of the electrical conditioning of the CIM layer on the device performance.