Solution Processing of Inorganic Semiconductors: Opportunities for Electronics and Energy Technologies

Seminar series
Inorganic Chemistry
Mon, Feb 4 4:30pm
3069 Young Hall
Speaker Dr. David B. Mitzi
IBM T. J. Watson Research Center

The effort to identify low-cost, high-throughput solution-based deposition techniques for preparing thin-film semiconductors has generated substantial recent interest, as a result of new applications potentially enabled by the technologies (e.g., flexible displays, smart cards/fabric, large-area solar cells).  While much work in this field has focused on organic systems, this talk will address solution-based processing of inorganic-based semiconductors.  The demonstration of spin-coated and melt-processed hybrid perovskites, comprising a semiconducting metal halide framework and functional organic molecules, has opened important opportunities for fundamental chemistry study, as well as application in electronic devices such as thin-film transistors (TFTs) and solar cells. Similarly, the development of highly soluble hydrazine-based chalcogenide precursors has enabled the deposition of ultrathin metal chalcogenide films with large field-effect mobilities (up to 15 cm2/V-s) for use in TFTs.  Thicker metal chalcogenide films have been solution deposited as solar cell absorbers, yielding devices with up to 15% power conversion efficiency—including world-record performance for Cu-Zn-Sn-S-Se kesterites that rely on earth abundant metals.  Development of these and related high performance solution-processed inorganic semiconductors offers outstanding opportunities for meeting price and performance targets for emerging technologies.