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Unconventional solution-phase epitaxial growth of organic-inorganic hybrid perovskite nanocrystals on metal sulfide nanosheets



Epitaxial heterostructures based on organic-inorganic hybrid perovskites and two-dimensional materials hold great promises in optoelectronics, but they have been prepared only via solid-state methods that restricted their practical applications. Herein, we report cubic-phased MAPbBr3 (MA=CH3NH3+) nanocrystals were epitaxially deposited on trigonal/hexagonal-phased MoS2 nanosheets in solution by facilely tuning the solvation conditions. In spite of the mismatched lattice symmetry between the square MAPbBr3 (001) overlayer and the hexagonal MoS2 (001) substrate, two different aligning directions with lattice mismatch of as small as 1% were observed based on the domainmatching epitaxy. This was realized most likely due to the flexible nature and absence of surface dangling bonds of MoS2 nanosheets. The formation of the epitaxial interface affords an effective energy transfer from MAPbBr3 to MoS2, and as a result, paper-based photodetectors facilely fabricated from these solution-dispersible heterostructures showed better performance compared to those based on MoS2 or MAPbBr3 alone. In addition to the improved energy transfer and light adsorption, the use of MoS2 nanosheets provided flexible and continuous substrates to connect the otherwise discrete MAPbBr3 nanocrystals and achieved the better film forming ability. Our work suggests that the scalable preparation of heterostructures based on organic-inorganic hybrid perovskites and 2D materials via solution-phase epitaxy may bring about more opportunities for expanding their optoelectronic applications.


基于外延异质结构的有机-无机杂化钙钛矿/二维纳米片复合材料在光电领域具有很好的应用前景, 但目前使用的固相制备方法大大限制了这一目标的实现. 我们通过精细调节溶剂环境, 成功利用外延沉积的方式实现了在三角/六方相MoS2纳米片表面生长立方相MAPbBr3(MA=CH3NH3+)钙钛矿纳米晶. 虽然MAPbBr3与MoS2存在较大的晶格不匹配度, 但是由于MoS2纳米片性质柔软且表面缺失悬挂键, 可以在两条不同方向上观察到较高容忍度(∼1%错位)的外延生长关系. 这种外延界面的形成有利于MAPbBr3与MoS2之间有效的能量转移, 因此基于MAPbBr3/MoS2异质结的纸质器件与MAPbBr3或MoS2器件相比具有更优异的光电性能. 此外, 除了提高光吸收能力和能量传递, MoS2纳米片的存在还为离散的MAPbBr3纳米晶提供柔性和连续的基底, 从而改善了MAPbBr3纳米晶粒的成膜能力. 这种液相外延法可用于高性能的有机无机杂化钙钛矿与二维材料的异质结构材料的大规模制备, 将推动异质结构材料在光电领域的广泛使用.


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This research was supported by the National Natural Science Foundation of China (51322202), and the Young 1000 Talents Global Recruitment Program of China. Xing G acknowledges the financial support from Macau Science and Technology Development Fund (FDCT-116/2016/A3 and FDCT-091/2017/A2), Research Grant (SRG2016-00087-FST) from the University of Macau, the Natural Science Foundation of China (91733302, 61605073 and 2015CB932200), and the Young 1000 Talents Global Recruitment Program of China.

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Correspondence to Guichuan Xing, Xiao Huang or Wei Huang.

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Zhipeng Zhang received his bachelor degree in 2015 at Nanjing Tech University. He is now a master student in the Institute of Advanced Materials (IAM) of Nanjing Tech University. His current research interest is the synthesis and applications of perovskite nanocrystals.

Guichuan Xing obtained his BSc in 2003 at Fudan University and PhD in 2011 at National University of Singapore. He joined IAM of Nanjing Tech University as a professor in 2014. His current research interest is nonlinear optical properties and ultrafast carrier dynamics in novel optoelectronic materials and devices.

Xiao Huang received her bachelor’s degree from the School of Materials Science and Engineering at Nanyang Technological University in Singapore in 2006 and completed her PhD in 2011 under the supervision of Prof. Hua Zhang and Prof. Freddy Boey. She is currently a professor at the Institute of Advanced Materials (IAM), Nanjing Tech University. Her research interest includes the synthesis and applications of two-dimensional nanomaterial-based hybrids.

Wei Huang received his BSc, MSc, and PhD degrees in Chemistry from Peking University in 1983, 1988, and 1992, respectively. He is a member of the Chinese Academy of Sciences, and a foreign member of the Russian Academy of Sciences. In 2001, he became a chair professor at Fudan University, where he founded the Institute of Advanced Materials. In June 2006, he was appointed the Deputy President of Nanjing University of Posts and Telecommunications, where he founded the Key Laboratory for Organic Electronics and Information Displays. In July 2012, he was appointed the President of Nanjing Tech University and moved to Northwestern Polytechnical University in 2017, where he is currently the Provost of Northwestern Polytechnical University. His research interest includes organic optoelectronics, nanomaterials, flexible electronics, and bioelectronics.

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Unconventional solution-phase epitaxial growth of organic-inorganic hybrid perovskite nanocrystals on metal sulfide nanosheets

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Zhang, Z., Sun, F., Zhu, Z. et al. Unconventional solution-phase epitaxial growth of organic-inorganic hybrid perovskite nanocrystals on metal sulfide nanosheets. Sci. China Mater. 62, 43–53 (2019).

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  • organic-inorganic hybrid perovskite
  • transition metal chalcogenide
  • epitaxial growth
  • paper-based photodetector