We report a pentafluorobenzene-based additive (FPE) to control the donor/acceptor (D/A) interfacial morphology via quadrupolar electrostatic interactions between donor and acceptor polymers in all-polymer solar cells (all-PSCs). The morphology changes are investigated using a combination of atomic force microscopy, grazing incidence wide-angle X-ray scattering, and near-edge X-ray absorption fine-structure spectroscopy. Unlike a conventional solvent additive, such as 1,8-diiodooctane, a bicontinuous interpenetrating morphology without large-scale phase separation and an enhanced π−π stacking with face-on orientation are found in the FPE processed blended films. These morphology changes improve the charge carrier extraction and charge transport between D/A interfaces to achieve an increase in the photovoltaic performance of all-PSCs.

AIPE active deep-red and near infrared iridium(iii) complexes were developed using electron withdrawing substituents and effectively utilized them in solution processable PhOLEDs.

Two different kinds of ancillary ligands such as picolinate and thenoyltrifluoroacetylacetonate have profound effects on the excited state properties of deep red emissive iridium(iii) complexes

Substituent effects on the photophysics of deep-red to near-infrared emissive iridium(iii) complexes.