Tunable Ferroelectricity in Ruddlesden-Popper Halide Perovskites

Qiannan Zhang, Ankur Solanki, Kaushik Parida, David Giovanni, Mingjie Li, Thomas L. C. Jansen, Maxim S. Pshenichnikov, Tze Chien Sum

OnderzoeksoutputAcademicpeer review

21 Citaten (Scopus)
94 Downloads (Pure)

Samenvatting

Ruddlesden-Popper (RP) halide perovskites are the new kids on the block for high-performance perovskite photovoltaics with excellent ambient stability. The layered nature of these perovskites offers an exciting possibility of harnessing their ferroelectric property for photovoltaics. Adjacent polar domains in a ferroelectric material allow the spatial separation of electrons and holes. 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)((n) over bar -1)Pb(n) over barI3 (n) over bar +1. Second harmonic generation (SHG) confirms the noncentrosymmetric nature of these polycrystalline thin films, whereas piezoresponse 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 degrees C in these films. Extensive molecular dynamics simulations support the experimental results and identified the 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.

Originele taal-2English
Pagina's (van-tot)13523-13532
Aantal pagina's10
TijdschriftACS Applied Materials & Interfaces
Volume11
Nummer van het tijdschrift14
DOI's
StatusPublished - 10-apr-2019

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