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Updated: Jun 26, 2026
Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
Molecular Surface Self-Accumulation Toward High-Efficiency and Mechanically Robust Flexible Perovskite Solar Cells
Ruilin Han1, Peimin Weng2, Yiming Huangfu2
1State Key Laboratory of Flexible Electronics (LOFE) & Institute of Flexible Electronics (IFE), Shaanxi Key Laboratory of Flexible Electronics, MIIT Key Laboratory of Flexible Electronics (KLOFE), Northwestern Polytechnical University, Xi'an, China.
Researchers developed a molecular surface self-accumulation strategy to enhance flexible perovskite solar cells (F-PSCs). This method improves spatial homogeneity, boosting efficiency and stability for portable energy applications.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Flexible perovskite solar cells (F-PSCs) offer potential for portable energy systems but suffer from lower efficiency and stability compared to rigid devices.
- Key challenges include high substrate roughness leading to interface heterogeneity and reduced carrier transport, along with mechanical instability from dynamic stress.
Purpose of the Study:
- To enhance the efficiency and mechanical stability of ultra-thin flexible perovskite solar cells.
- To address the issues of spatial heterogeneity and interfacial delamination in F-PSCs.
Main Methods:
- A molecular surface self-accumulation strategy was employed using halogenated phenothiazine-based molecules (Br-4PAPT) added to the perovskite precursor solution.
- Br-4PAPT molecules diffuse during crystallization to fill vacancies in the underlying self-assembled monolayers (SAMs), improving interface homogeneity.
- The strategy was combined with a mechanical neutral plane design for ultra-thin F-PSCs.
Main Results:
- Record efficiencies of 22.02% (1 cm²) and 24.47% (0.1 cm²) were achieved for p-i-n structured ultra-thin (9 µm) F-PSCs.
- Ultra-thin large-area F-PSCs demonstrated a power-per-weight of 12.71 W/g.
- The modified F-PSCs maintained 91.81% of their initial efficiency after 10,000 bending cycles at a 2 mm radius.
Conclusions:
- The molecular surface self-accumulation strategy effectively enhances the spatial homogeneity of interfaces in F-PSCs, significantly improving both power conversion efficiency and mechanical robustness.
- This approach represents a significant advancement for the development of high-performance, stable, and flexible solar energy solutions for portable applications.
