Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Publication date: 23rd October 2018
Recently, 2D-layered perovskites have attracted extensive attention, mainly due to their improved stability compared with 3D counterpart and remarkable optoelectrical properties. Large-sized cations (typically ammonium-based cations such as phenyl ethyl-ammonium (PEA) or butyl-ammine (BA)) which aren't compatible with ABX3 lattice structure slice the 3D ABX3 perovskite to form 2D-layered Ruddlesden-Popper perovskite with a formula of A2’An-1PbnX3n+1, where n is the layer number of PbI6octahedral between two large-sized cations. In our previous works, we control the PEAI/PbI2 ratio (from 2 to 0) to achieve composition engineering in the hybrid 2D/3D perovskite via low-pressure vapor-assisted solution process (LP-VASP). In this study, we further overdope the amount of PEAI (PEAI/PbI2=3) to enhance the 2D-layered perovskite residual in the vapor-treated film. From the steady photoluminescence (PL) spectrum, different characteristic peaks are simultaneously excited, implying the formation of multiple 2D-layered perovskite with variant n value. We conduct confocal and two-photon absorption microscopy to spatial map the multiple 2D perovskite. Surface potential mapping along with surface morphology of high-content PEA perovskite film measured by Kelvin probe force microscopy (KPFM) also allow us to identify the spatial distribution of 2D-layered perovskite.
The authors are grateful to the financial support from the Ministry of Science and Technology (MOST 107-2221-E-006-190-MY3 and MOST 107- 2119-M-006-002).
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