Versatile Reactive Gradient Block Copolymer System for Highly Robust Nanopatterns With Spontaneous Vertical Orientation

Why It Matters

The breakthrough removes a key barrier to deploying high‑χ block copolymers in semiconductor manufacturing, delivering finer, more reliable patterns for next‑generation chips.

Key Takeaways

• Gradient block allows diverse high‑χ derivative synthesis
• Spontaneous vertical orientation achieved without surface neutralization
• Nanopatterns down to 7 nm linewidth with low roughness
• Demonstrated as EUV photoresist height enhancer, aspect ratio 5.78
• Scalable synthesis compatible with organosilicon and organotin chemistries

Pulse Analysis

Directed self‑assembly of high‑χ block copolymers has been hailed as a cost‑effective route to sub‑10 nm features, yet conventional chemistries struggle with vertical orientation and limited post‑synthetic tunability. Traditional BCPs often require elaborate surface neutralization layers, adding process complexity and variability. The industry’s demand for tighter pitch control and lower line‑edge roughness in advanced logic and memory nodes makes these shortcomings a critical bottleneck.

The newly reported GRC‑BCP system tackles these issues by embedding a reactive gradient block within a random copolymer matrix. This gradient architecture acts as a molecular scaffold that can be chemically expanded after polymerization, granting access to a library of high‑χ monomers such as organosilicon and organotin units. Because the gradient induces intrinsic surface energy asymmetry, the copolymer self‑orients vertically on a wide range of substrates without the need for external neutral layers. The result is a highly controllable patterning window, delivering line widths from 7 to 13 nm with line‑edge roughness near 1 nm.

For semiconductor lithography, the implications are profound. The organosilicon variant demonstrated exceptional performance as an extreme ultraviolet (EUV) photoresist height enhancer, enabling silicon etch patterns with an aspect ratio of 5.78 at a 13 nm half‑pitch. Such fidelity meets the stringent requirements of emerging nodes, reducing defectivity and simplifying mask design. Beyond chips, the platform’s modular chemistry opens pathways for nanophotonic devices, biosensors, and quantum materials where precise vertical nanostructures are essential. As the industry pushes toward heterogeneous integration, the GRC‑BCP’s scalability and versatility position it as a cornerstone material for next‑generation nanofabrication.