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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...

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Wafer-Scale Single-Crystal WSe2 Monolayers Using Substrate-Passivation-Driven Epitaxy.

Lin-Yun Huang1, Yu-Wei Hsu2, Fangyuan Zheng3

  • 1Department of Material Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan.

ACS Nano
|January 2, 2026
PubMed
Summary
This summary is machine-generated.

A new passivation-driven epitaxy strategy enables wafer-scale, single-orientation p-type tungsten diselenide (WSe2) monolayers. This breakthrough advances 2D electronics by overcoming challenges in producing high-quality p-type transition metal dichalcogenides (TMDs).

Keywords:
WSe2 monolayerp-type TMDssingle-orientationsubstrate-passivation epitaxial growthsurface engineeringwafer-scale

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDs) are crucial for next-generation electronics and optoelectronics due to their subnanometer thickness and unique functionalities.
  • P-type TMDs, like tungsten diselenide (WSe2), are essential for complementary metal-oxide-semiconductor (CMOS) 2D circuits, but achieving wafer-scale, single-orientation monolayers remains a significant challenge compared to n-type materials.
  • Existing methods struggle to produce large-area, highly oriented p-type TMD monolayers, hindering their integration into advanced electronic devices.

Purpose of the Study:

  • To develop a robust strategy for producing wafer-scale, single-orientation p-type WSe2 monolayers.
  • To overcome the limitations in achieving high-quality, oriented p-type TMDs for scalable 2D electronic applications.
  • To establish a materials platform that bridges the performance gap between n-type and p-type 2D semiconductors.

Main Methods:

  • Implementation of a substrate-passivation-driven epitaxy strategy.
  • In situ substrate treatment involving precise control over the introduction sequence of H2 gas and Se vapor.
  • Engineering of an AlOSe2-Se-passivated sapphire surface to stabilize the WSe2 monolayer growth.
  • Growth of WSe2 monolayers on a two-inch C-plane sapphire substrate.

Main Results:

  • Achieved a 98.44% single-orientation WSe2 monolayer on a two-inch C-plane sapphire substrate, significantly surpassing previous benchmarks (82-87%).
  • The engineered passivation layer stabilized the WSe2 monolayer with a predominantly 30° single orientation.
  • Optical and electrical characterization confirmed the structural uniformity and consistent device performance across wafer-scale transistor arrays.

Conclusions:

  • The developed passivation-driven epitaxy strategy is a breakthrough for scalable, single-orientation p-type TMD monolayers.
  • This method provides a robust materials platform for advancing 2D electronics and optoelectronics.
  • It effectively bridges the performance gap between n-type and p-type 2D semiconductors, paving the way for fully integrated 2D CMOS circuits.