Reactively sputtered nickel nitride as electrocatalytic counter electrode for dye- and quantum dot-sensitized solar cells

Jin Soo Kang, Min Ah Park, Jae Yup Kim, Sun Ha Park, Dong Young Chung, Seung-Ho Yu, Jin Kim, Jongwoo Park, Jung Woo Choi, Kyung Jae Lee, Juwon Jeong, Min Jae Ko, Kwang Soon Ahn, Yung Eun Sung

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Abstract

Nickel nitride electrodes were prepared by reactive sputtering of nickel under a N 2 atmosphere at room temperature for application in mesoscopic dye- or quantum dot- sensitized solar cells. This facile and reliable method led to the formation of a Ni 2 N film with a cauliflower-like nanostructure and tetrahedral crystal lattice. The prepared nickel nitride electrodes exhibited an excellent chemical stability toward both iodide and polysulfide redox electrolytes. Compared to conventional Pt electrodes, the nickel nitride electrodes showed an inferior electrocatalytic activity for the iodide redox electrolyte; however, it displayed a considerably superior electrocatalytic activity for the polysulfide redox electrolyte. As a result, compared to dye-sensitized solar cells (DSCs), with a conversion efficiency (η) = 7.62%, and CdSe-based quantum dot-sensitized solar cells (QDSCs, η = 2.01%) employing Pt counter electrodes (CEs), the nickel nitride CEs exhibited a lower conversion efficiency (η = 3.75%) when applied to DSCs, but an enhanced conversion efficiency (η = 2.80%) when applied to CdSe-based QDSCs.

Original languageEnglish
Article number10450
JournalScientific reports
Volume5
DOIs
Publication statusPublished - 2015 May 21
Externally publishedYes

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    Soo Kang, J., Park, M. A., Kim, J. Y., Ha Park, S., Young Chung, D., Yu, S-H., Kim, J., Park, J., Choi, J. W., Jae Lee, K., Jeong, J., Jae Ko, M., Ahn, K. S., & Sung, Y. E. (2015). Reactively sputtered nickel nitride as electrocatalytic counter electrode for dye- and quantum dot-sensitized solar cells. Scientific reports, 5, [10450]. https://doi.org/10.1038/srep10450