Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
DOI: https://doi.org/10.29363/nanoge.hopv.2018.117
Publication date: 21st February 2018
Organic-inorganic hybrid perovskite has attracted extensive attention in recent years for its wide applications in various optoelectronic devices such as solar cells, light emitting diodes (LEDs), lasers, transistors, and photodetectors. However, it is still challenging to directly pattern perovskite thin films because perovskite is very sensitive to polar solvents and high temperature environment. In this work, we demonstrate our novel approach to fabricate high-quality perovskite grating and its potential applications in optoelectronic devices through the study of the performances of grating patterned light emitting diode.[1]
Our results show that (1) different from typical imprint method to form nanograting, we report for the first time to utilize methylamine gas (MA) to fabricate CH3NH3PbI3 (MAPbI3) periodic nanostructures via MA induced phase transition under ambient condition (the MA induced intermediate is liquid under room temperature). This approach is quite different from traditional nanoimprinting which use high pressure to press the rigid mold and completely different from most used photo-lithography or electron beam lithography technique which needs solvent to etch the sample. (2) our direct nano-patterning approach is suitable for fabrication of large-area perovskite pattern. As a proof of concept in lab scale, 15 mm*15 mm periodic nanostructures have been demonstrated. (3) Our direct nano-patterning approach can not only fabricate periodic nanostructures in different perovskite materials such as MAPbI3 and HC(NH2)2PbI3 (FAPbI3) but also improve the crystallinity, light absorption and emission of perovskite for solar cell and LED applications. It should be noted that some works reported by others also demonstrate the fabrication of perovskite grating, however most of them lead to reduced crystallinity and PL. Consequently, our approach opens up a simple way to nano-engineering perovskite. The nano-patterned perovskite can be used in different perovskite optoelectronic devices.
Reference: [1] Adv. Funct. Mater., 2017, DOI: 10.1002/adfm.201606525.
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