Nanoscale Engineering of Polymorphism in Cu2Se-Based Composites

Lu, Ruiming; Olvera, Alan; Bailey, Trevor P.; Uher, Ctirad; Poudeu, Pierre P.

doi:10.1021/acsami.0c06968

Nanoscale Engineering of Polymorphism in Cu₂Se-Based Composites

Journal Article · Fri Jun 19 00:00:00 EDT 2020 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.0c06968· OSTI ID:1656920

Lu, Ruiming ^[1]; Olvera, Alan ^[2]; Bailey, Trevor P. ^[2]; Uher, Ctirad ^[2]; ^[2]

University of Michigan, Ann Arbor, MI (United States); University of Michigan
University of Michigan, Ann Arbor, MI (United States)

Crystal polymorphism selection during synthesis is extremely challenging. However, promoting the formation of a specific metastable polymorph enables modulation of the functional properties of phase-change materials through alteration of the relative abundance of various polymorphs. Here, we demonstrate the stabilization of the superionic β-Cu₂Se phase under ambient conditions and the direct control over the relative ratio between the α-Cu₂Se and β-Cu₂Se polymorphs in (x)CuGaSe₂/(1-x)Cu₂Se composites using CuGaSe₂ nanoseeds. Here, we found that the small lattice mismatch between β-Cu₂Se (cubic) and the ab plane of tetragonal CuGaSe₂ nanoseeds promotes the formation of low-energy coherent CuGaSe₂/β-Cu₂Se interfaces leading to preferential stabilization of β-Cu₂Se. Astonishingly, the hierarchical microstructure of the resulting composites enables a remarkable decoupling of charge and heat transport, which is manifested by a breakdown of the Wiedemann-Franz law

View Accepted Manuscript (DOE)

Research Organization:: University of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0018941

OSTI ID:: 1656920

Journal Information:: ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 28 Vol. 12; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Nanoscale Engineering of Polymorphism in Cu₂Se-Based Composites