Dual molecular bridges at perovskite heterointerfaces for efficient inverted solar cells

Journal article

Utilizing molecular bridges presents a promising means to enhance the performance of perovskite solar cells (PSCs). However, concurrently bridging the perovskite absorber and its two adjacent interfaces remains a significant challenge that is yet to be achieved. Here, we construct dual molecular bridges at perovskite heterointerfaces, enabled by a self-organizing additive of 4-fluoro-phenethylammonium formate (4-F-PEAFa) and a synthesized hole transporter of [2-(7H-dibenzo[c, g]carbazol-7-yl)ethyl]phosphonic acid (DBZ-2PACz). The molecular bridges spanning two interfaces lead to the formation of an ‘integral carrier transport pathway’, mitigating both non-radiative recombination and charge-transport losses in the fabricated PSC devices. We thus achieve a champion power conversion efficiency (PCE) of 26.0% (25.6% certified) in inverted PSCs, accompanied by an exceptionally high fill factor of 0.87 (maximum 0.88 from the certified devices, 97% of its Shockley–Queisser limit) and a low ideality factor of 1.06. The unencapsulated devices retain 96% of their PCEs after aging at 85°C for 2200 h and 90% after maximum power point tracking at an elevated temperature of 50°C for 973 h.

Authors: Lian, Q; Wang, L; Wang, G; Mi, G; Li, B

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Oxford University Press
• Journal: National Science Review
• Volume: 12
• Issue: 7
• Article number: nwaf211
• Publication date: 2025-05-22
• Acceptance date: 2025-05-21
• DOI: 10.1093/nsr/nwaf211
• EISSN: 2053-714X
• ISSN: 2095-5138
• Language: English
• Keywords: perovskite solar cell; self-assemble material; heterointerface engineering; molecular bridge