Photoluminescence mapping of 2D/3D perovskite film prepared by low pressure vapor assisted solution process
Yu-An Chen a, Ming-Hsien Li a, Peter Chen a b c
a Department of Photonics, National Cheng Kung University, Tainan 701, Taiwan, ROC.
b Hierarchical Green-Energy Materials (Hi-GEM) Research Center, National Cheng Kung University, 70101 Tainan, Taiwan, ROC
c Division Director of Education & Research Center for Micro/Nano Science and Technology (CMNST), National Cheng Kung University, 70101 Tainan, Taiwan, ROC
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Kyōto-shi, Japan, 2019 January 27th - 29th
Organizers: Hideo Ohkita, Atsushi Wakamiya and Mohammad Nazeeruddin
Poster, Yu-An Chen, 121
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 ABXlattice structure slice the 3D ABXperovskite 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/PbIratio (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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