Paper alert - Linking Nanoscopic Insights to Millimetric-Devices!
© 2024, Advanced Materials
Happy to share our new article 'Linking Nanoscopic Insights to Millimetric-Devices in Formamidinium-Rich Perovskite Photovoltaics', published in Advanced Materials.
In this review, the phase instabilities in state-of-the-art formamidinium (FA)-rich perovskite absorbers are discussed. Challenges in the field are assessed and future research directions are proposed for improving the operational lifetimes of perovskite devices. These approaches, which bridge nanoscale structural properties to working solar cell devices, are believed to be critical to assessing the realization of a bankable PSC product.'
Link to article
Happy to share our new article 'Linking Nanoscopic Insights to Millimetric-Devices in Formamidinium-Rich Perovskite Photovoltaics', published Advanced Materials.
Highlights from the review article;
''This review discusses the phase instabilities in state-of-the-art formamidinium (FA)-rich perovskite absorbers. Also, the concerted efforts are summarized in this prospect, covering aspects from fundamental research to device engineering. Subsequently, a critical analysis of the dictating impact of the nanoscale landscape of perovskite materials on their resulting intrinsic stability is provided ’. Finally, the remaining challenges in the field are assessed and future research directions are proposed for improving the operational lifetimes of perovskite devices. These approaches, which bridge nanoscale structural properties to working solar cell devices, are believed to be critical to assessing the realization of a bankable PSC product.''
''The intrinsic stability of FA-rich perovskite absorbers is a long-standing challenge that needs to be well understood and overcome to validate their commercial deployment. Many studies have revealed that the presence of detrimental nanoscale phase impurities such as δ-phases/SFs is most probably linked with local chemical heterogeneity as a result of complexity in achieving homogeneous distribution of A-site cations in the perovskite lattice. Based on this, we propose three pathways to tackle this phase impurities/compositional heterogeneity issue; first: researching additives or process modification strategies that target the complete conversion of a α-FAPbI3 phase at room temperature without any A-site cationic additives, a feat that has already been achieved for MAPbI3.[40] This will eliminate the possibility of any nanoscale hexagonal phase transitions which are thermodynamically favored at room temperature after the annealing step. Second, exploring ligands or growth templating agents to stabilize the desirable cubic photo-active phase, inspired by the success of ethylenediaminetetraacetic acid (EDTA) chelating agent[32] (However, it should be highlighted that the authors should have assessed the impact of these structural modifications on working solar cell devices to make their argument more solid). In principle, this templating strategy should revert face-sharing atomic stackings (δ-phases) to corner-shared ones (α-phase). Third, the formation of δ-phases/SFs in FA-rich perovskites could be facet-dependent; if so, then retrieving the orientation of these facets and consequently applying the concept of facet-dependent passivation molecules[95, 96] will be critical to guide the design of efficient and stable FAPbI3-based perovskite absorbers. Overcoming these intrinsic instabilities of FA-rich perovskites, as well as designing robust interfaces, will have a considerable impact on enhancing the operational stability of perovskite devices.''