Year: 2024
Type: article
Abstract: The power conversion efficiencies (PCEs) of perovskite solar cells have recently developed rapidly compared to crystalline silicon solar cells. To have an effective way to control the crystallization of perovskite thin films is the key for achieving good device performance. However, a paradox in perovskite crystallization is from the mismatch between nucleation and Oswald ripening. Usually, the large numbers of nucleation sites tend to weak Oswald ripening. Here, we proposed a new mechanism to promote the formation of nucleation sites by reducing surface energy from 44.9 mN/m to 36.1 mN/m, to spontaneously accelerate the later Oswald ripening process by improving the grain solubility through the elastic modulus regulation. The ripening rate is increased from 2.37 Åm ⋅ s −1 to 4.61 Åm ⋅ s −1 during annealing. Finally, the solar cells derived from the optimized films showed significantly improved PCE from 23.14 % to 25.32 %. The long‐term stability tests show excellent thermal stability (the optimized device without encapsulation maintaining 82 % of its initial PCE after 800 h aging at 85 °C) and an improved light stability under illumination. This work provides a new method, the elastic modulus regulation, to enhance the ripening process.
Institutions: Shaanxi Normal University, Xi'an University of Science and Technology, Shaanxi University of Science and Technology, City University of Hong Kong, Northwestern Polytechnical University, State Key Laboratory of Solidification Processing, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, University of Chinese Academy of Sciences
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
Funders: City University of Hong Kong, Aromatic Plant Research Center, National Natural Science Foundation of China, China Postdoctoral Science Foundation, Innovation and Technology Commission, Natural Science Foundation of Shaanxi Province, Higher Education Discipline Innovation Project, Yulin University, Dalian National Laboratory for Clean Energy
Awards: G1474490597, G1574357809, G1851116662, G269063593, Using High-Throughput Optical Model to Design High Performance Thin Film Structures for Next-Generation Glass Materials and Products, G2755695991, Development of Efficient and Stable Perovskite Solar Cell with Safe-to-Use, G3116420487, G3224889482, G3632838754, G3686599914, G4025736820, G402712756, G4357002305, G4965598876, G5118648314, G533179223, G5420718260, G5873749235, G5985085803, G5996436051, G6208525038, G6505287937, G6925525404, G7819260696, G8211567928, G8724210328
OpenAlex ID: W4391238579