The field of organic photovoltaics (OPVs) has seen remarkable progress, largely fueled by the development of advanced non-fullerene acceptors (NFAs). Among these, Y6 (BTP-4F) and its chlorinated counterpart, Y7 (BTP-4Cl), stand out as pivotal materials. Understanding the nuanced differences between these two NFAs is key to optimizing OPV device design. NINGBO INNO PHARMCHEM CO.,LTD. is a trusted supplier of both these cutting-edge materials.

Y6, characterized by its fused thienothienopyrrolo-thienothienoindole (TTP-TTI) core and difluorinated indene malononitrile end units (2FIC), established a new standard for NFA performance. It demonstrated impressive PCEs when paired with polymer donors like PM6. Y7, on the other hand, replaces the fluorine atoms in the end units with chlorine atoms. This seemingly small modification leads to significant changes in the material's properties, offering distinct advantages for OPV applications.

The primary difference lies in their optical and electronic characteristics. Y7 exhibits a redshift in its optical absorption spectrum by approximately 20 nm compared to Y6. This means Y7 can absorb light in a slightly longer wavelength range, including the near-infrared, potentially leading to better light harvesting. Electronically, Y7 shows a downshift of about 100 meV in its LUMO level. This can influence the energy offset with the donor material, impacting charge separation and the resulting open-circuit voltage (Voc). Indeed, Y7 has been shown to provide higher Voc values than Y6 in optimized devices.

Both Y6 and Y7 are highly conjugated and possess an A-DAD-A structure, making them excellent electron-deficient acceptors. Their performance in OPV devices is often evaluated in terms of PCE, charge carrier mobility, and device stability. While Y6 opened the door to high efficiencies, Y7 builds upon this foundation by offering improvements in light absorption and voltage, further enhancing the potential for high-performance organic solar cells. NINGBO INNO PHARMCHEM CO.,LTD. ensures that both materials are available at high purity for researchers to conduct comparative studies and push the boundaries of OPV technology.

For those looking to buy Y7 or Y6, or to explore the critical role of NFA organic photovoltaic solar cell materials, understanding these distinctions is vital. The choice between Y7 and Y6 may depend on the specific donor material and desired device characteristics. NINGBO INNO PHARMCHEM CO.,LTD. is committed to supporting innovation in organic electronics by providing access to these advanced materials.