Related Experiment Video
Updated: Oct 26, 2025
In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation
Published on: March 2, 2021
p-Type Carbon Dots for Effective Surface Optimization for Near-Record-Efficiency CsPbI2 Br Solar Cells
Xi Guo1, Biao Zhao2, Kunxiang Xu2
1Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, China.
Functionalized blue carbon dots (B-CDs) enhance perovskite solar cell (PSC) performance and stability by passivating defects and improving charge transport. This interface modification leads to higher efficiency and remarkable long-term durability for CsPbI2Br PSCs.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Efficient charge transport and minimal recombination are critical for high-performing perovskite solar cells (PSCs).
- Interface engineering is a key strategy to overcome performance limitations in PSCs.
Purpose of the Study:
- To investigate the use of functionalized p-type blue carbon dots (B-CDs) as an interface passivation layer in all-inorganic CsPbI2Br PSCs.
- To enhance the power conversion efficiency (PCE) and long-term stability of CsPbI2Br PSCs through B-CDs modification.
Main Methods:
- Blue carbon dots (B-CDs) with N-H, C-N, C-O, and C-O functional groups were synthesized and applied as a passivation layer.
- Characterization of defect passivation via hydrogen and coordinative bonds with perovskite ions (I- and Pb2+).
- Fabrication and testing of CsPbI2Br PSCs with and without B-CDs modification, including stability tests under ambient conditions.
Main Results:
- B-CDs effectively passivated defects in the perovskite layer by interacting with I- and Pb2+ ions.
- The p-type B-CDs formed a P-N junction with the n-type perovskite, facilitating hole transfer and blocking electrons.
- B-CDs modification improved the hydrophobicity of the perovskite film, enhancing device stability.
- Modified CsPbI2Br PSCs achieved a high PCE of 16.76%.
- Devices retained 95.33% of their initial PCE after 1000 hours of ambient storage, demonstrating excellent air and light stability.
Conclusions:
- Functionalized blue carbon dots serve as an effective interface passivation layer for CsPbI2Br PSCs.
- B-CDs modification significantly boosts both the efficiency and long-term operational stability of perovskite solar cells.
- Blue carbon dots show great potential for application in advanced perovskite-based optoelectronic devices.
