Journal
ADVANCED SCIENCE
Volume 8, Issue 14, Pages -Publisher
WILEY
DOI: 10.1002/advs.202100546
Keywords
inorganic p‐ type semiconductors; thin‐ film transistors; copper iodide; transparent conductors
Categories
Funding
- Ministry of Science and ICT through the National Research Foundation - Korean government [NRF-2021R1A2C3005401, 2020M3F3A2A01085792]
- Samsung Display Corporation
- National Research Foundation of Korea [2020M3F3A2A01085792] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This paper discusses the potential of CuI as a promising p-type material in various devices, including transparent electrodes, thermoelectric devices, p-n diodes, transistors, light emitting diodes, and solar cells. The focus is on the electronic structure and defect states of CuI, as well as the design concepts for adjusting its optoelectrical properties through different approaches.
Developing transparent p-type semiconductors and conductors has attracted significant interest in both academia and industry because metal oxides only show efficient n-type characteristics at room temperature. Among the different candidates, copper iodide (CuI) is one of the most promising p-type materials because of its widely adjustable conductivity from transparent electrodes to semiconducting layers in transistors. CuI can form thin films with high transparency in the visible light region using various low-temperature deposition techniques. This progress report aims to provide a basic understanding of CuI-based materials and recent progress in the development of various devices. The first section provides a brief introduction to CuI with respect to electronic structure, defect states, charge transport physics, and overviews the CuI film deposition methods. The material design concepts through doping/alloying approaches to adjust the optoelectrical properties are also discussed in the first section. The following section presents recent advances in state-of-the-art CuI-based devices, including transparent electrodes, thermoelectric devices, p-n diodes, p-channel transistors, light emitting diodes, and solar cells. In conclusion, current challenges and perspective opportunities are highlighted.
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