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Published on: November 5, 2014
Dual Dynamic Covalent Bond Adaptive Networks for High-Performance, HTL-Free Carbon-Based Perovskite Solar Cells
Xianfei Cao1, Tong Hu1, Yong Qi2
1State Key Laboratory of Fine Chemicals, Frontier Science Center For Smart Materials, Dalian University of Technology, Dalian, China.
Small (Weinheim an Der Bergstrasse, Germany)
|July 28, 2026
Summary
Researchers developed a new passivation strategy for hole-transport layer-free carbon-based perovskite solar cells (HTL-free C-PSCs). This method uses in situ polymerizable additives to create dual-dynamic covalent bond adaptive networks, significantly boosting efficiency and long-term stability.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Hole-transport layer-free carbon-based perovskite solar cells (HTL-free C-PSCs) offer cost-effectiveness and stability.
- Challenges remain in enhancing their long-term operational stability and defect passivation.
Purpose of the Study:
- To develop a novel passivation encapsulation strategy for HTL-free C-PSCs.
- To improve the intrinsic stability and defect passivation using in situ polymerizable additives.
Main Methods:
- Introduction of Bis(2-furylmethyl)disulfide (BFDS) and diphenylmethane dimaleimide (DMI) into the perovskite precursor.
- In situ polymerization of BFDS and DMI during annealing via Diels-Alder reactions to form polymer dual-dynamic covalent bond adaptive networks (DDCAN).
- Characterization of perovskite crystallization, moisture resistance, device efficiency, and stability.
Main Results:
- Synergistic regulation of perovskite crystallization by BFDS and DMI.
- Formation of DDCAN at grain boundaries, enhancing intrinsic moisture resistance.
- Achieved a champion power conversion efficiency of 22.00% for HTL-free C-PSCs.
- Unencapsulated devices retained over 95% efficiency after 5000 hours of aging in N2.
- Demonstrated self-recovery capability of perovskite devices after thermal degradation.
Conclusions:
- The proposed in situ polymerization strategy effectively creates dynamic networks for enhanced perovskite solar cell performance.
- DDCAN formation significantly improves the stability and self-healing properties of HTL-free C-PSCs.
- This approach offers a promising pathway for developing highly efficient and stable simplified-structure perovskite photovoltaic devices.
