Crovetto Andrea, Hempel Hannes, Rusu Marin, Choubrac Leo, Kojda Danny, Habicht Klaus, Unold Thomas
Department of Structure and Dynamics of Energy Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner Platz 1, 14109 Berlin, Germany.
Department of Methods for Characterization of Transport Phenomena in Energy Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner Platz 1, 14109 Berlin, Germany.
ACS Appl Mater Interfaces. 2020 Oct 28;12(43):48741-48747. doi: 10.1021/acsami.0c11040. Epub 2020 Oct 15.
CuI has been recently rediscovered as a p-type transparent conductor with a high figure of merit. Even though many metal iodides are hygroscopic, the effect of moisture on the electrical properties of CuI has not been clarified. In this work, we observe a 2-fold increase in the conductivity of CuI after exposure to ambient humidity for 5 h, followed by slight long-term degradation. Simultaneously, the work function of CuI decreases by almost 1 eV, which can explain the large spread in the previously reported work function values. The conductivity increase is partially reversible and is maximized at intermediate humidity levels. On the basis of the large intragrain mobility measured by THz spectroscopy, we suggest that hydration of grain boundaries may be beneficial for the overall hole mobility.
最近，碘化亚铜（CuI）作为一种具有高优值的p型透明导体被重新发现。尽管许多金属碘化物具有吸湿性，但水分对CuI电学性能的影响尚未明确。在这项工作中，我们观察到CuI在暴露于环境湿度5小时后，电导率增加了两倍，随后是轻微的长期降解。同时，CuI的功函数降低了近1 eV，这可以解释先前报道的功函数值的较大差异。电导率的增加部分是可逆的，并且在中等湿度水平下达到最大值。基于太赫兹光谱测量的大晶粒内迁移率，我们认为晶界的水合作用可能有利于整体空穴迁移率。
