Initial Light Soaking Treatment Enables Hole Transport Material to Outperform Spiro-OMeTAD in Solid-State Dye-Sensitized Solar Cells

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• 作者：Lei Yang ; Bo Xu ; Dongqin Bi ; Haining Tian ; Gerrit Boschloo ; Licheng Sun ; Anders Hagfeldt ; Erik M. J. Johansson
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：May 15, 2013
• 年：2013
• 卷：135
• 期：19
• 页码：7378-7385
• 全文大小：422K
• 年卷期：v.135,no.19(May 15, 2013)
• ISSN：1520-5126

文摘

Efficient solid state dye-sensitized solar cells (sDSCs) were obtained using a small hole transport material, MeO-TPD (N,N,N鈥?N鈥?tetrakis(4-methoxyphenyl)benzidine), after an initial light soaking treatment. It was discovered that the light soaking treatment for the MeO-TPD based solar cells is essential in order to achieve the high efficiency (4.9%), which outperforms spiro-OMeTAD based sDSCs using the same dye and device preparation parameters. A mechanism based on Li⁺ ion migration is suggested to explain the light soaking effect. It was observed that the electron lifetime for the MeO-TPD based sDSC strongly increases after the light soaking treatment, which explains the higher efficiency. After the initial light soaking treatment the device efficiency remains considerably stable with only 0.2% decrease after around 1 month (unsealed cells stored in dark).