A Versatile and Simple Approach to Generate Light Emission in Semiconductors Mediated by Electric Double Layers

Jiang Pu, Taiyo Fujimoto, Yuki Ohasi, Shota Kimura, Chang-Hsiao Chen, Lain-Jong Li, Tomo Sakanoue, Taishi Takenobu

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


The light-emitting device is the primary device for current light sources. In principle, conventional light-emitting devices need heterostructures and/or intentional carrier doping to form a p-n junction. This junction formation is, however, very difficult to achieve for most emerging semiconductors, and the fabrication of light-emitting devices is invariably a significant challenge. This study proposes a versatile and simple approach to realize light-emitting devices. This proposed device requires only a semiconducting film with two electrodes that are covered with an electrolyte. This unique structure achieves light emission at a voltage slightly larger than the bandgap energy of materials. This study applies this concept to emerging direct bandgap semiconductors, such as transition metal dichalcogenide monolayers and zinc oxide single crystals. These devices generate obvious light emission and provide sufficient evidence of the formation of a dynamic p-i-n junction or tunneling junction, presenting a versatile technique to develop optoelectronic devices.
Original languageEnglish (US)
Pages (from-to)1606918
JournalAdvanced Materials
Issue number24
StatePublished - Apr 18 2017

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: T.T. was partially supported by the Funding Program for the Next Generation of World-Leading Researchers and Grants-in-Aid from MEXT (JP26107533, JP26102012, JP16K13618, JP15K21721, and JP25000003). T.S. was supported by the Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Young Scientists (A) (JP26706012). J.P. was supported by the Leading Graduate Program in Science and Engineering, Waseda University from MEXT, and by the Research Fellowship for Young Scientists from JSPS. L.J.L. acknowledges support from KAUST (Saudi Arabia), the Ministry of Science and Technology, Taiwan Consortium of Emergent Crystalline, Academia Sinica Taiwan, and AOARD-134137 (USA). C.H.C. acknowledges the supports from the Ministry of Science and Technology, MOST104-2218-E-035-010 and MOST104-2628-E-035-002-MY3.


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