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Presently, the structure-function properties governing the ferroelectric behavior of RP perovskites are an open question. Herein, we realize tunable ferroelectricity in 2-phenylethylammonium (PEA) and methylammonium (MA) RP perovskite (PEA)2(MA)n̄-1Pbn̄I3n̄+1. Second harmonic generation confirms the non-centrosymmetric nature of these poly-crystalline thin films; while piezo force microscopy and polarization-electric field measurements validate the microscopic and macroscopic ferroelectric properties. Temperature dependent SHG and dielectric constant measurements uncover a phase transition temperature at around 170 °C in these films. Extensive Molecular Dynamics (MD) simulations support the experimental results and identified correlated reorientation of MA molecules and ion translations as the source of ferroelectricity. Current-voltage characteristics in the dark reveal the persistence of hysteresis in these devices, which has profound implications for light harvesting and light emitting applications. Importantly, our findings disclose a viable approach for engineering the ferroelectric properties of RP perovskites that may unlock new functionalities for perovskite optoelectronics."},"software":{"citation:softwareName":"OriginPro","citation:softwareVersion":"8.5"},"citation:keyword":[{"citation:keywordValue":"Ruddlesden-popper perovskites"},{"citation:keywordValue":"ferroelectricity"},{"citation:keywordValue":"second harmonic generation"},{"citation:keywordValue":"polarization-electric field"},{"citation:keywordValue":"molecular simulation"}],"citation:datasetContact":[{"citation:datasetContactName":"Zhang Qiannan","citation:datasetContactAffiliation":"Nanyang Technological University"},{"citation:datasetContactName":"Sum, Tze Chien","citation:datasetContactAffiliation":"Nanyang Technological University"}],"publication":[{"publicationCitation":"Zhang, Q., Solanki, A., Parida, K., Giovanni, D., Li, M., Jansen, T. L. C., Pshenichnikov, M. S.,& Sum, T. C. (2019). Tunable Ferroelectricity in Ruddlesden–Popper Halide Perovskites. ACS Applied Materials & Interfaces, 11(14), 13523-13532.","publicationIDType":"doi","publicationIDNumber":"10.1021/acsami.8b21579","publicationURL":"https://pubs.acs.org/doi/10.1021/acsami.8b21579"},{"publicationCitation":"Zhang, Q., Solanki, A., Parida, K., Giovanni, D., Li, M., Jansen, T. L. C., Pshenichnikov, M. S.,& Sum, T. C. (2019). Tunable Ferroelectricity in Ruddlesden–Popper Halide Perovskites. 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