Transparent 3 nm-thick MoS₂ counter electrodes for bifacial dye-sensitized solar cells
- Authors
- Jeong, Taehee; Ham, So-Yeon; Koo, Bonkee; Lee, Phillip; Min, Yo-Sep; Kim, Jae-Yup; Ko, Min Jae
- Issue Date
- Dec-2019
- Publisher
- ELSEVIER SCIENCE INC
- Keywords
- Molybdenum disulfide; Atomic layer deposition; Bifacial solar cells; Counter electrode
- Citation
- JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, v.80, pp.106 - 111
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
- Volume
- 80
- Start Page
- 106
- End Page
- 111
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/32805
- DOI
- 10.1016/j.jiec.2019.07.037
- ISSN
- 1226-086X
- Abstract
- Molybdenum disulfide (MoS2) counter electrode (CE) is considered one of the most viable alternatives to Pt CE in dye-sensitized solar cells (DSSCs) owing to its abundance, low cost, and superior electrocatalytic activity. However, mostly, MoS2 CEs for DSSCs are prepared by conventional chemical reactions and annealing at a high temperature. By these conventional processes, deposition of sufficiently thin and transparent MoS2 layers is challenging; therefore, bifacial DSSCs employing transparent MoS2 CEs have not been studied. Here, we report transparent few-nanometer-thick MoS2 CEs prepared by atomic layer deposition at a relatively low temperature (98 degrees C) for bifacial DSSC applications. MoS2 nanofilms with precisely controlled thicknesses of 3-16 nm are conformally coated on transparent conducting oxide glass substrates. With increase in the MoS2 nanofilm thickness, the MoS2 CE electrocatalytic activity for the iodide/triiodide redox couple enhances, but its transparency decreases. Notably, the application of a thinner MoS2 nanofilm in a bifacial DSSC leads to lower conversion efficiency under front-illumination, but higher conversion efficiency under back-illumination. In particular, only the 3 nm-thick MoS2 nanofilm shows reasonable photovoltaic performances under both front- and back-illumination conditions.
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