Single-Crystalline and Back-Contact Perovskite Optoelectronics
Udo Bach a b, Wenxin Mao a, Xiongfeng LIn a, Siqi Deng a
a ARC Centre of Excellence in Exciton Science, Department of Chemical Engineering, Monash University, Clayton, VIC, Australia
b Melbourne Centre for Nanofabrication, Australia
Invited Speaker, Udo Bach, presentation 040
DOI: https://doi.org/10.29363/nanoge.iperop.2020.040
Publication date: 14th October 2019

Solution-processed thin films of lead halide perovskites show exceptional properties, making them interesting candidates for a range of optoelectronic applications such as solar cells and light-emitting diodes. The thickness and crystallite-size in these films is typically in the sub-micron range, resulting in an abundance of grain-boundaries. Here we will describe techniques for growing thin single-crystalline lead perovskite crystallites with edge lengths of several tens of microns and thicknesses of around 1 micron, starting from single-source 1D lead halide perovskite precursors. In a first study we used platelet-shaped MAPbBr3 single-crystals to fabricate active electro-optical modulators (AEOM) exhibiting > 98% light transmission intensity modulation. In a second study we successfully grew mixed halide MAPbBr(3-x)Ix single crystals to study photoinduced halide demixing in crystalline materials, using a range of different spectroscopic techniques such as narrowband fluorescence imaging and time-resolved spectroscopy. In the final section of this talk we will report on the recent progress in the development of back-contact perovskite solar cells, including the use of mask-free lithography techniques and novel honey-comb-like back-contact architectures.

We gratefully acknowledge financial support from from the Australian Research Council (CE170100026 and DP160104575) and the Australian Renewable Energy Agency through the Australian Centre for Advanced Photovoltaics. We also thank Melbourne Centre for Nanofabrication and Monash Centre of Electron Microscope for the technical support.

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