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Defect Dynamics and Solution-Processed Interconnects in Perovskite-Organic Tandem Solar Cells
Yingjie Hu1, Qianyi Li1, Kaifeng Jing1
1Department of Electrical and Electronic Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, 999077, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|December 12, 2025
Summary
Perovskite-organic tandem solar cells achieve over 25% efficiency by addressing defects in wide-bandgap perovskite layers and optimizing interconnecting layers. This breakthrough enhances both performance and stability for next-generation solar technology.
Area of Science:
- Materials Science
- Renewable Energy
- Semiconductor Physics
Background:
- Perovskite and organic semiconductors share properties like bandgap tunability and solution processability, making them suitable for perovskite-organic tandem solar cells (POTSCs).
- Efficiency and stability of POTSCs are currently limited by electrical losses in wide-bandgap (WBG) perovskite layers and interconnecting layers (ICLs).
Purpose of the Study:
- To identify the cause of open-circuit voltage (VOC) losses in WBG perovskites and mitigate them.
- To develop improved ICLs for POTSCs to reduce electrical losses and enhance device stability.
- To achieve high efficiency and operational stability in POTSCs through synergistic strategies.
Main Methods:
- Investigated mobile defects at the surface regions of WBG perovskites as the cause of VOC losses.
- Employed a passivation agent with functional chemical groups to heal mobile defects in WBG perovskites.
- Developed solution-processed graphene oxide (GO) layers as ICLs for tandem solar cells.
Main Results:
- Passivation of mobile defects enhanced VOC to 1.35 V for WBG perovskite solar cells (bandgap 1.81 eV).
- Solution-processed GO ICLs reduced electrical losses and improved the operational stability of POTSCs.
- Synergistic integration of defect passivation and optimized ICLs enabled POTSCs to exceed 25% efficiency.
Conclusions:
- Effective passivation of WBG perovskite surface defects is crucial for improving VOC.
- Graphene oxide ICLs offer a viable solution for reducing losses and enhancing stability in POTSCs.
- The developed strategies pave the way for highly efficient and stable perovskite-organic tandem solar cells.
