Abstract
Two-dimensional (2D) layered hybrid organic-inorganic perovskites (HOIPs) have demonstrated improved stability and promising photovoltaic performance. The mechanical properties of such functional materials are both fundamentally and practically important to achieve both high performance and mechanically stable (flexible) devices. Here, we report the mechanical properties of a series of 2D layered lead iodide HOIPs and investigate the role of structural subunits (e.g., variation of the length of the organic spacer molecules, R and the number of inorganic layers, n) in the mechanical properties. Although 2D HOIPs have much lower nominal elastic modulus and hardness than 3D HOIPs, larger n number and shorter R lead to stiffer materials. Density functional theory simulations showed a trend similar to the experimental results. We compared these findings with other 2D layered crystals and shed light on routes to further tune the out-of-plane mechanical properties of 2D layered HOIPs.
Original language | English (US) |
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Pages (from-to) | 22167-22173 |
Number of pages | 7 |
Journal | ACS Applied Materials and Interfaces |
Volume | 10 |
Issue number | 26 |
DOIs | |
State | Published - Jul 5 2018 |
Funding
This work made use of the SPID facilities of the Northwestern University's NUANCE Center, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) resource (NSF ECCS-1542205); the MRSEC program (NSF DMR-1720139) at the Materials Research Center; the International Institute for Nanotechnology (IIN); the Keck Foundation, and the State of Illinois, through the IIN. This work was supported by the National Science Foundation IDBR Grant Award Number 1256188, and partially supported by Air Force Research Laboratory grant FA8650-15-2-5518. M.G.K. acknowledges the support under ONR Grant N00014-17-1-2231.
Keywords
- mechanical properties
- nanoindentation
- out-of-plane
- structureproperty relationship
- two-dimensional hybrid organic-inorganic perovskites
ASJC Scopus subject areas
- General Materials Science