In the field of semiconductor optoelectronics, there are still several urgent issues to be addressed regarding materials, efficiency, lifespan, color performance, large-scale fabrication, flexibility, packaging, and production processes. The deficiencies in these aspects have significantly hindered the industrialization of organic optoelectronic functional materials and technologies. Centering on the R&D chain of "material design and synthesis – high-performance device fabrication – device physics research – technology promotion and application," this research direction will strengthen the investigation of key technologies such as high-efficiency optoelectronic functional materials, novel device structures, device stability, and mass production processes, laying a solid foundation for the industrial transformation of scientific research achievements.

Research will be carried out mainly in the following aspects:

1. Research on optoelectronic functional materials

Focusing on three core material systems (crystalline silicon, perovskite, and organic photovoltaic materials), targeted structural design and performance optimization studies will be conducted. For crystalline silicon materials: Key research will focus on the development of high-efficiency passivation layer materials and low-defect crystal growth technologies. Through doping regulation, surface texturing, and other methods, the efficiency of carrier separation and transport will be improved, and the response range to the solar spectrum will be expanded. For perovskite materials: Research will revolve around component regulation, defect engineering, and interface modification of organic-inorganic hybrid perovskites and all-inorganic perovskites. The goal is to develop perovskite materials with high crystalline quality, excellent stability, and broad-spectrum absorption, addressing the performance degradation issues in humid and high-temperature environments. For organic photovoltaic materials: Efforts will be devoted to the molecular design and synthesis of novel conjugated polymer donor materials and non-fullerene acceptor materials. The energy level structure, solubility, and film-forming properties of materials will be optimized to enhance light absorption efficiency and charge separation capability, promoting the synergistic improvement of efficiency and stability in organic solar cells.

2. Research on electroluminescent devices

Taking OLEDs (Organic Light-Emitting Diodes) and PeLEDs (Perovskite Light-Emitting Diodes) as core research objects, the focus will be on device performance optimization and application scenario expansion. For OLED devices: Research will target two main application directions. In the lighting field, the development of white OLED devices with high brightness, high color rendering index, and long lifespan will be prioritized, with optimization of device structures and material combinations to improve luminous efficiency and reduce driving voltage. In the display field, technical development will focus on large-sized ultra-high-definition panels, flexible display panels, and microdisplay devices, breaking through key technologies such as precise color control, flexible substrate adaptation, and large-size uniformity to meet the demands of the high-end display market. For PeLED devices: Aiming at high brightness, high color purity, and long lifespan, research will be conducted on crystallization regulation, interface modification, and structural innovation of perovskite emissive layers. Solution-based large-scale fabrication processes will be developed to explore application potential in emerging fields such as flexible displays, transparent displays, and micro-luminous arrays, addressing the luminous stability of perovskite materials and compatibility with device packaging.

3. Research on photovoltaic devices

Focusing on performance breakthroughs and technical implementation of crystalline silicon photovoltaic devices and perovskite photovoltaic devices, efforts will be made to promote the development of high-efficiency and low-cost photovoltaic technologies.

For crystalline silicon photovoltaic devices, Key research will focus on the development of high-efficiency battery structures such as Passivated Emitter and Rear Contact (PERC), Heterojunction (HJT), and Tunnel Oxide Passivated Contact (TOPCon). Electrode fabrication processes and module integration technologies will be optimized to improve photoelectric conversion efficiency and module reliability, reducing the manufacturing cost per unit power. For perovskite photovoltaic devices: Exploration of the performance limits of single-junction perovskite solar cells will be conducted, while advancing the research and development of tandem battery technologies such as perovskite/crystalline silicon and perovskite/copper indium gallium selenide (CIGS) to enhance full-spectrum solar energy utilization efficiency through spectral complementarity. Low-temperature fabrication processes and flexible substrate adaptation technologies for flexible perovskite photovoltaic devices will be developed to expand applications in scenarios such as wearable devices and Building-Integrated Photovoltaics (BIPV).

4. Research on field-effect transistors

Taking OFETs (Organic Field-Effect Transistors) as the core, the research will focus on improving key device performance and expanding functions. High-performance organic semiconductor active layer materials will be developed, with carrier mobility and environmental stability enhanced through molecular structure design. Device structure design will be optimized, including the selection of top-gate/bottom-gate structures, electrode material modification, and insulation layer interface optimization, to reduce device operating voltage and improve field-effect mobility and on/off current ratio. The integrated applications of OFETs in flexible electronics, sensor arrays, organic logic circuits, printed electronics, and other fields will be explored. Low-temperature mass production processes compatible with flexible substrates will be developed to promote the large-scale application of organic electronic devices.

5. Research on thin-film encapsulation technology

Targeting the stability requirements of optoelectronic functional devices (especially flexible devices), research and development of high-barrier and high-flexibility thin-film encapsulation technologies will be carried out. The chemical reaction mechanisms between water vapor/oxygen and optoelectronic materials will be thoroughly studied, clarifying the degradation pathways of device performance, so as to provide a theoretical basis for the selection of encapsulation materials and structural design. Highly hydrophobic organic encapsulation materials and low-water-permeability inorganic encapsulation materials (such as silicon oxide, silicon nitride, and aluminum oxide) will be developed. The design of organic/inorganic multi-layer composite encapsulation structures will be optimized, and interlayer adhesion will be improved through interface modification to significantly reduce the permeability of water vapor and oxygen. Low-temperature and large-area encapsulation processes compatible with flexible devices will be developed to balance the barrier performance, flexibility, and cost of encapsulation layers, meeting the stringent long-term stability requirements of OLEDs, PeLEDs, flexible photovoltaic devices, and other related devices.

Editor: Danting Xiang