期刊
ADVANCED MATERIALS
卷 30, 期 30, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201801401
关键词
2D; 3D hybrid perovskites; low-temperature vapor-assisted solution processing; perovskite solar cells; Ruddlesden-Popper perovskites
类别
资金
- Ministry of Science and Technology [MOST 106-2119-M-006-017, MOST 106-2811-M-006-046, MOST 106-2119-M-006-027, MOST 106-2119-M-006-004]
- Top-Notch Project under the Headquarter of University Advancement at the National Cheng Kung University - Ministry of Education, Taiwan, ROC
- Research Center for Energy Technology and Strategy (RCETS), National Cheng Kung University
- Advanced Optoelectronic Technology Center (AOTC), National Cheng Kung University
- Hierarchical Green-Energy Materials (Hi-GEM) Research Center, from The Featured Areas Research Center Program within the Ministry of Education (MOE) in Taiwan
The fabrication of multidimensional organometallic halide perovskite via a low-pressure vapor-assisted solution process is demonstrated for the first time. Phenyl ethyl-ammonium iodide (PEAI)-doped lead iodide (PbI2) is first spin-coated onto the substrate and subsequently reacts with methyl-ammonium iodide (MAI) vapor in a low-pressure heating oven. The doping ratio of PEAI in MAI-vapor-treated perovskite has significant impact on the crystalline structure, surface morphology, grain size, UV-vis absorption and photoluminescence spectra, and the resultant device performance. Multiple photoluminescence spectra are observed in the perovskite film starting with high PEAI/PbI2 ratio, which suggests the coexistence of low-dimensional perovskite (PEA(2)MA(n-1)Pb(n)I(3n+1)) with various values of n after vapor reaction. The dimensionality of the as-fabricated perovskite film reveals an evolution from 2D, hybrid 2D/3D to 3D structure when the doping level of PEAI/PbI2 ratio varies from 2 to 0. Scanning electron microscopy images and Kelvin probe force microscopy mapping show that the PEAI-containing perovskite grain is presumably formed around the MAPbI(3) perovskite grain to benefit MAPbI(3) grain growth. The device employing perovskite with PEAI/PbI2 = 0.05 achieves a champion power conversion efficiency of 19.10% with an open-circuit voltage of 1.08 V, a current density of 21.91 mA cm(-2), and a remarkable fill factor of 80.36%.
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