Interfacial Hydrogen Bonding for Efficient and Robust Flexible Tin Perovskite Solar Cells

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Flexible tin perovskite solar cells (F-TPSCs) are promising for wearable electronics due to high efficiency and eco-friendliness.
• Performance limitations arise from poor interfacial adhesion and substrate deformation in F-TPSCs.
• Defects at buried interfaces hinder charge transport and device stability.

Purpose of the Study:

• To enhance the performance and stability of flexible tin perovskite solar cells.
• To improve interfacial adhesion and perovskite film quality using a novel additive.
• To explore the potential of 1-chloro-1-deoxy-D-fructose (1-CDF) in F-TPSC fabrication.

Main Methods:

• Incorporation of 1-chloro-1-deoxy-D-fructose (1-CDF) into the PEDOT:PSS hole-transporting layer.
• Utilizing hydrogen-bonding interactions to improve adhesion between ITO, PEDOT:PSS, and perovskite layers.
• Investigating the effect of 1-CDF on perovskite crystallization dynamics and film morphology.

Main Results:

• Enhanced interfacial adhesion and improved perovskite film quality (pinhole-free, high crystallinity).
• Increased conductivity and better energy level alignment of the PEDOT:PSS layer due to 1-CDF.
• Achieved power conversion efficiencies (PCEs) of 15.56% (0.049 cm^2) and 11.06% (1 cm^2).
• Demonstrated a high PCE of 22.21% under indoor lighting and excellent device stability.

Conclusions:

• 1-CDF effectively addresses interfacial issues in F-TPSCs by promoting adhesion and improving perovskite film quality.
• The modified PEDOT:PSS layer exhibits enhanced electronic properties, boosting device performance.
• This work presents a viable strategy for developing high-performance, stable F-TPSCs for diverse applications.