Structure-Dependent Photoluminescence in Low-Dimensional Ethylammonium, Propylammonium, and Butylammonium Lead Iodide Perovskites

Lead (geology)
DOI: 10.1021/acsami.9b17881 Publication Date: 2019-12-31T07:48:00Z
ABSTRACT
Hybrid organic–inorganic perovskites have attracted great attention as the next generation materials for photovoltaic and light-emitting devices. However, their environment instability issue remains largest challenge practical applications. Recently emerging two-dimensional (2D) with Ruddlesden–Popper structures are found to greatly improve stability aging problems. Furthermore, strong confinement of excitons in these natural quantum-well results distinct narrow light emission visible spectral range, enabling development spectrally tunable sources. Besides quasi-monochromatic emission, some 2D composed specific organic cations inorganic layer emit a pronounced broadband emission. Herein, we report properties degradation low-dimensional consisting three shortest alkylammonium spacers, mono-ethylammonium (EA), n-propylammonium (PA), n-butylammonium (BA). While (BA)2PbI4 is known form well-oriented thin films layers corner-sharing PbI6 octahedra separated by bilayer BA cations, EA shorter alkyl chains tends other types lower-dimensional structures. Nevertheless, optical absorption edges as-prepared fresh EAPbI3, (PA)2PbI4, obviously blue-shifted 2.4–2.5 eV compared 3D counterpart, methylammonium lead iodide (MAPbI3) perovskite, they all excitonic photoluminescence. carefully optimizing deposition conditions, achieved predominantly structure (PA)2PbI4. unlike (BA)2PbI4, upon exposure ambient environment, (PA)2PbI4 readily transforms different crystal structure, exhibiting prominently from ∼500 800 nm gradual increase intensity structural transformation proceeds.
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