TY - JOUR
T1 - Out-of-Plane Mechanical Properties of 2D Hybrid Organic-Inorganic Perovskites by Nanoindentation
AU - Tu, Qing
AU - Spanopoulos, Ioannis
AU - Hao, Shiqiang
AU - Wolverton, Chris
AU - Kanatzidis, Mercouri G.
AU - Shekhawat, Gajendra S.
AU - Dravid, Vinayak P.
N1 - Publisher Copyright:
© Copyright 2018 American Chemical Society.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018/7/5
Y1 - 2018/7/5
N2 - 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.
AB - 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.
KW - mechanical properties
KW - nanoindentation
KW - out-of-plane
KW - structureproperty relationship
KW - two-dimensional hybrid organic-inorganic perovskites
UR - http://www.scopus.com/inward/record.url?scp=85048371257&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85048371257&partnerID=8YFLogxK
U2 - 10.1021/acsami.8b05138
DO - 10.1021/acsami.8b05138
M3 - Article
C2 - 29882400
AN - SCOPUS:85048371257
VL - 10
SP - 22167
EP - 22173
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 26
ER -