The efficiency loss caused by area scaling is one of the key factors hindering the development of the perovskite solar cell industry. Chen Junchao of Shanghai Jiao Tong University and others obtained a self-assembled monolayer (SAM ) with a large dipole moment (2.32D), Ph-4PACz. The study found that Ph-4PACz with high polarity can improve the band alignment and minimize energy loss, resulting in an open circuit voltage (Voc) of 1.55eV perovskite as high as 1.2V. However, when applied to large-area devices, the fill factor (FF) degrades significantly.
Therefore, the authors introduced aluminum oxide nanoparticles (Al2O3-NP) into the interface between Ph-4PACz and the rough FTO substrate to further improve the flatness, thereby forming a conformal perovskite film with almost no voids in the interface, and then Promotes low exciton binding energies, fast hot carrier extraction and low non-radiative recombination.
The final device achieved a small-area power conversion efficiency (PCE ) of 25.60% and a large-area (1 cm2) PCE of 24.61%. In addition, the authors conducted small module and stability tests to prove the feasibility of commercialization.
Anxin Sun et.al High Open-Circuit Voltage (1.197 V) in Large-Area (1 cm2) Inverted Perovskite Solar Cell via Interface Planarization and Highly Polar Self-Assembled Monolayer Adv. Energy Mater. 2024
DOI: 10.1002/aenm.202303941
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