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CuI has been recently rediscovered as a p-type transparent conductor with ahigh figure of merit. Even though many metal iodides are hygroscopic, theeffect of moisture on the electrical properties of CuI has not been clarified.In this work, we observe a two-fold increase in the conductivity of CuI afterexposure to ambient humidity for 5 hours, followed by slight long-termdegradation. Simultaneously, the work function of CuI decreases by almost 1 eV,which can explain the large spread in the previously reported work functionvalues. The conductivity increase is partially reversible and is maximized atintermediate humidity levels. Based on the large intra-grain mobility measuredby THz spectroscopy, we suggest that hydration of grain boundaries may bebeneficial for the overall hole mobility.

Water adsorption enhances electrical conductivity in transparent p-type CuI