Effects of the diphenyl ether additive in halogen-free processed non-fullerene acceptor organic solar cells

Abstract

The development of an environmentally friendly fabrication process for non-fullerene acceptor organic solar cells is an essential condition for their commercialization. However, devices fabricated by processing the active layer with...

Understanding the Surface Chemistry of SnO2 Nanoparticles for High Performance and Stable Organic Solar Cells

“…[11,14,15] In particular, the commercially available Alfa Aesar water-based SnO 2 (Alfa-SnO 2 ) is one of the most promising options due to its low cost and benign solvent, making it an excellent candidate for a lab-to-fab transition. [16][17][18] Unfortunately, surface defects are inherent to nanoparticle surfaces, which ultimately can affect negatively the interface with the active layer, and the device performance. [19] Intriguingly, while several groups have reported passivation methods for the SnO 2 nanoparticle surface that employ for instance organic molecules, [20][21][22][23] quantum dots, [24] or even perovskite nanowires, [25] an accurate description of the origin of the surface defects is still missing.…”

Additive-assisted strategy for high-efficiency organic solar cells

“…The additives with different structures such as DIO and 1-CN were also developed. [80][81][82][83][84] Huang et al designed the additive, 2,5-dibromo-3,4-difluorothiophene (FBrT, Fig. 1a), with the traits of high boiling point and fine dissolving capacity, which enabled FBrT to prolong the crystallization and phase separation kinetic process during the film formation.…”

“…1a), a non-halogenated solvent additive, was also widely used in fabricating environmentally friendly OSCs with green processing solvents. [81][82][83] Recently, Zhang et al applied DPE in the donor layer of PNTB6-Cl/BTP-4F-12 (Fig. 2) based QPHJ OSCs and obtained a high PCE of 17.81%, compared with the control device without DPE (17.07%).…”

Progress in organic photovoltaics based on green solvents: from solubility enhancement to morphology optimization

“…37,[77][78][79][80][81][82][83][84] Meanwhile, the additive strategy employs the addition of small amounts of specific agents to modify the dynamic process of crystal formation in the active layer, thus achieving better molecular mixing and higher PCEs. 49,[85][86][87][88][89][90][91][92][93] As for the posttreatment method, it applies selective treatment processes to the films after deposition to enhance their morphologies or further influence the crystallization of the photoactive materials. 23,79,88,[94][95][96][97][98][99] Finally, the film coating method regulation is used to control factors such as temperature, humidity, solution concentration, coating speed, drying time, etc., which affect the quality of the active layer film, creating an ideal structure for efficient exciton dissociation and charge transport.…”