Zero thermal expansion in a nanostructured inorganic-organic hybrid crystal |
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Authors: | Zhang Y Islam Z Ren Y Parilla P A Ahrenkiel S P Lee P L Mascarenhas A McNevin M J Naumov I Fu H-X Huang X-Y Li J |
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Institution: | National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401, USA. yong_zhang@nrel.gov |
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Abstract: | There are very few materials that exhibit zero thermal expansion (ZTE), and of these even fewer are appropriate for electronic and optoelectronic applications. We find that a multifunctional crystalline hybrid inorganic-organic semiconductor, beta-ZnTe(en)(0.5) (en denotes ethylenediamine), shows uniaxial ZTE in a very broad temperature range of 4-400 K, and concurrently possesses superior electronic and optical properties. The ZTE behavior is a result of compensation of contraction and expansion of different segments along the inorganic-organic stacking axis. This work suggests an alternative route to designing materials in a nanoscopic scale with ZTE or any desired positive or negative thermal expansion (PTE or NTE), which is supported by preliminary data for ZnTe(pda)(0.5) (pda denotes 1,3-propanediamine) with a larger molecule. |
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