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Internal Ultrathin Hydrophobic Self-Assembled Capping Layers Enables Moisture-Resistant All-Perovskite Tandems
Shiqiang Fu1, Guang Li1, Kexin Ming1
1School of Physics and Technology, Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|March 26, 2026
Summary
We developed a new encapsulation method using hydrophobic molecules to protect wide-bandgap perovskite solar cells from humidity. This significantly improves the operational stability and efficiency of perovskite tandem solar cells.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Operating stability is a major challenge for all-perovskite tandem solar cells.
- Degradation of wide-bandgap (WBG) perovskite films under humidity hinders commercialization.
Purpose of the Study:
- To develop an internal encapsulation strategy to enhance the stability of WBG perovskite solar cells.
- To improve the moisture and operational stability of all-perovskite tandem solar cells.
Main Methods:
- An internal encapsulation strategy using phosphonic acid-terminated hydrophobic molecules was employed.
- These molecules formed a hydrophobic capping layer on the tin oxide electron transport layer, protecting WBG perovskites.
- The strategy aimed to maintain efficient interfacial charge transport while preventing degradation.
Main Results:
- Encapsulated WBG perovskite devices (1.77 eV) retained 95% of their initial PCE after 2500h at 65% RH and 2000h at 85% RH.
- All-perovskite tandem devices achieved a maximum steady-state PCE of 29.01%.
- Encapsulated devices maintained 90% of initial efficiencies after 2000h (WBG) and 750h (tandem) of operation under 1-sun illumination (ISOS-L-1).
Conclusions:
- The internal encapsulation strategy effectively enhances moisture and operational stability.
- This approach provides a viable path for the commercialization of high-performance all-perovskite tandem solar cells.
