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Ten subphthalocyanine triimides (SubPcTI) with different substituents at imide sites and B atoms were designed and synthesized. These compounds with low-lying lowest unoccupied molecular orbital energy levels (from −3.91 to −3.98 eV), strong absorption in the range of 450–650 nm, and adjustable solubility are expected to be excellent electron acceptors. Non-fullerene bulk heterojunction organic solar cells based on acceptor 8c showed power conversion efficiency of 4.92%, which is the highest value among subphthalocyanine derivatives.

Protein adsorption behavior is a key factor that determines whether materials can be used as medical polymer materials. In this study, fibrinogen (Fib) adsorptions on three different poly(ethylene glycol) (PEG) surfaces that differed in chain length and chain density were investigated using a quartz crystal microbalance with dissipation (QCM-D) and a dual polarization interferometry (DPI) with respect to adsorbed masses, viscoelastic properties and chain conformations. On QCM-D chips, PEG chains were tight and in extended brush conformations. Meanwhile, on DPI chips, PEG 1000 and PEG 2000 may have the same pancake-like conformations, but PEG 5000 had a mushroom conformation. Moreover, several bare spaces were observed on the loose pancake-like PEG 1000 -and PEG 2000 -modified DPI surfaces. Fib could fully spread on the relatively dense PEG 1000 -modified DPI surface and partly spread and tightly orient on the relatively sparse PEG 2000 -modified DPI surface. Thus, grafting density was found to have greater significance in determining Fib adsorption resistance due to its influence on Fib spreading when the chain conformations of hydrophilic molecules were loose pancake-like structures. Furthermore, brush and mushroom structured PEG 5000 chains both had high deformation capacity, which excellently resisted protein adsorption by adjusting their conformation to decrease interaction with Fib. Therefore, the Fib adsorption resistance of PEG-modified surface depended on the grafting density of PEG layer and the deformation capacity of the PEG chain.