Stabilizing Buried Contacts in Hybrid-Deposited Perovskite Solar Cells via Amidinium-Based Passivation
Advanced Functional Materials, cilt.36, sa.63, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 36 Sayı: 63
- Basım Tarihi: 2026
- Doi Numarası: 10.1002/adfm.77018
- Dergi Adı: Advanced Functional Materials
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Applied Science & Technology Source, Chemical Abstracts Core, Chimica, Compendex, INSPEC, MEDLINE, Academic Search Ultimate (EBSCO)
- Anahtar Kelimeler: buried surface, evaporation-solution method, fully textured, lead iodide, perovskite solar cells, perovskite/silicon tandem solar cells
- Marmara Üniversitesi Adresli: Evet
Özet
Monolithic integration of perovskite solar cells (PSCs) with textured silicon is essential for commercializing perovskite/silicon tandem photovoltaics. Hybrid evaporation–solution processing enables conformal perovskite deposition on textured surfaces, but residual PbI2 at the buried interface limits performance and stability. Here, we introduce 2,4-difluorobenzamidine hydrochloride (2,4-FPhFACl) into self-assembled monolayers (SAMs) as a buried hole-selective contact to improve interface quality. The amidinium groups strongly interact with the perovskite, suppressing thermal decomposition and eliminating PbI2 formation. This approach enhances surface passivation and energy-level alignment. Wide-bandgap (1.65 eV) devices achieve a power conversion efficiency (PCE) of 20.19% and retain 80% efficiency after 2000 h at 85°C. Applied to fully textured perovskite/silicon tandems, this strategy delivers a champion PCE of 29.91% (1.04 cm2), offering a scalable route to high-performance tandem photovoltaics.