標題: Structure-Dependent Photoluminescence in Low-Dimensional Ethylammonium, Propylammonium, and Butylammonium Lead Iodide Perovskites
作者: Lin, Chang-Wei
Liu, Fangzhou
Chen, Ting-Yang
Lee, Kuan-Hua
Chang, Chung-Kai
He, Yanling
Leung, Tik Lun
Ng, Alan Man Ching
Hsu, Chia-Hung
Popovic, Jasminka
Djurisic, Aleksandra
Ahn, Hyeyoung
交大名義發表
National Chiao Tung University
關鍵字: two-dimensional materials;hybrid lead halide perovskites;alkylammonium;excitonic emission;broadband emission
公開日期: 29-Jan-2020
摘要: 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 as the largest challenge for practical applications. Recently emerging two-dimensional (2D) perovskites with Ruddlesden-Popper structures are found to greatly improve the stability and aging problems. Furthermore, strong confinement of excitons in these natural quantum-well structures results in the distinct and narrow light emission in the visible spectral range, enabling the development of spectrally tunable light sources. Besides the strong quasi-monochromatic emission, some 2D perovskites composed of the specific organic cations and inorganic layer structures emit a pronounced broadband emission. Herein, we report the light-emitting properties and the degradation of low-dimensional perovskites consisting of the three shortest alkylammonium spacers, mono-ethylammonium (EA), n-propylammonium (PA), and n-butylammonium (BA). While (BA)(2)PbI4 is known to form well-oriented 2D thin films consisting of layers of corner-sharing PbI6 octahedra separated by a bilayer of BA cations, EA with shorter alkyl chains tends to form other types of lower-dimensional structures. Nevertheless, optical absorption edges of asprepared fresh EAPbI(3), (PA)(2)PbI4, and (BA)(2)PbI4 are obviously blue-shifted to 2.4-2.5 eV compared to their 3D counterpart, methylammonium lead iodide (MAPbI(3)) perovskite, and they all emit narrow excitonic photoluminescence. Furthermore, by carefully optimizing deposition conditions, we have achieved a predominantly 2D structure for (PA)(2)PbI4. However, unlike (BA)(2)PbI4, upon exposure to ambient environment, (PA)(2)PbI4 readily transforms to a different crystal structure, exhibiting a prominently broadband light from similar to 500 to 800 nm and a gradual increase in intensity as structural transformation proceeds.
URI: http://dx.doi.org/10.1021/acsami.9b17881
http://hdl.handle.net/11536/153805
ISSN: 1944-8244
DOI: 10.1021/acsami.9b17881
期刊: ACS APPLIED MATERIALS & INTERFACES
Volume: 12
Issue: 4
起始頁: 5008
結束頁: 5016
Appears in Collections:Articles