Effect of Overlayer Thickness of Hole Transport Material on Photovoltaic Performance in Solid-Sate Dye-Sensitized Solar Cell
- Authors
- Kim, Hui-Seon; Lee, Chang-Ryul; Jang, In-Hyuk; Kang, Weekyung; Park, Nam-Gyu
- Issue Date
- 20-Feb-2012
- Publisher
- KOREAN CHEMICAL SOC
- Keywords
- Solid-state dye-sensitized solar cell; Hole transport; Spiro-MeOTAD; Overlayer thickness; Electron transport
- Citation
- BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.33, no.2, pp.670 - 674
- Journal Title
- BULLETIN OF THE KOREAN CHEMICAL SOCIETY
- Volume
- 33
- Number
- 2
- Start Page
- 670
- End Page
- 674
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/12493
- DOI
- 10.5012/bkcs.2012.33.2.670
- ISSN
- 0253-2964
- Abstract
- The photovoltaic performance of solid-state dye-sensitized solar cells employing hole transport material (HTM), 2,2',7,7'-tetrakis-(N,N-di-p-methoxyphenyl-amine)-9,9'-spirobifluorene (spiro-MeOTAD), has been investigated in terms of HTM overlayer thickness. Two important parameters, soak time and spin-coating rate, are varied to control the HTM thickness. Decrease in the period of loading the spiro-MeOTAD solution on TiO2 layer (soak time) leads to decrease in the HTM overlayer thickness, whereas decrease in spin-coating rate increases the HTM overlayer thickness. Photocurrent density and fill factor increase with decreasing the overlayer thickness, whereas open-circuit voltage remains almost unchanged. The improved photocurrent density is mainly ascribed to the enhanced charge transport rate, associated with the improved charge collection efficiency. Among the studied HTM overlayer thicknesses, ca. 230 nm-thick HTM overlayer demonstrates best efficiency of 4.5% at AM 1.5G one sun light intensity.
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