Challenges and Opportunities in 2D Optoelectronic Materials: Towards Enhanced Performances and Scalability

Dear Colleagues,

Two-dimensional optoelectronic materials, such as graphene and molybdenum disulfide (MoS2), feature unique two-dimensional structures with distinctive optical and electronic properties, making them promising for devices such as photodetectors, solar cells, and light emitters. However, these materials also face several challenges, including:

1. Quantum efficiency: The quantum efficiency of these materials often falls short of that of traditional materials. Enhancing their photon-to-electron conversion rate is a crucial challenge.
2. Degradation and stability: 2D materials can be susceptible to degradation from environmental factors such as moisture and oxygen, limiting their lifespan and effectiveness in devices.
3. Processing and manufacturing: Scaling up the production of these materials with consistent quality is a hurdle. Efficient and cost-effective manufacturing methods are needed to make these materials commercially viable.
4. Integration with conventional electronics: Integrating 2D materials with conventional electronics is a complex technical challenge. Ensuring compatibility and effectiveness in this integration is crucial for practical applications.
5. Spectral limitations: Some 2D materials have limitations regarding the spectrum of light they can absorb and emit. Expanding their spectral range is important for broadening their applications.
6. Manipulation and control: Precisely controlling the properties of these materials, such as modulating their energy bands, is essential to optimize their performance in optoelectronic devices.
7. Non-radiative photoluminescent effect: Many 2D materials exhibit a non-radiative photoluminescent effect, where absorbed energy is dissipated as heat rather than emitted as light. This reduces efficiency in emissive devices.
8. Scalability: While the promising properties of these materials are often demonstrated in the laboratory, making their production scalable for real-world applications is a significant challenge.

Overcoming these challenges requires ongoing research and innovation, with collaboration between materials science, device engineering, and manufacturing technology. This Special Issue addresses these challenges, aiming for a more comprehensive and effective exploration of 2D optoelectronic materials in various technological applications.

Dr. Ribeiro Vander Alkmin dos Santos
Dr. Adhimar Oliveira
Dr. Lin Gan
Guest Editors

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• 2D optoelectronic materials
• challenges
• quantum efficiency
• scalability
• integration
• spectral limitations
• photoluminescent effect