Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Efficient solid state dye-sensitized solar cells (sDSCs) were obtained using a small hole transport material, MeO-TPD, (N,N,N',N'-tetrakis(4-methoxyphenyl)benzidine) after an initial light soaking treatment. It was found that the light soaking treatment for the MeO-TPD based solar cells is essential in order to achieve the high efficiency, 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 one month (unsealed cells stored in dark).
Different hole transport materials were also compared for the perovskite (CH3NH3)PbI3 mesoscopic solid-state solar cells. Photoinduced absorption spectroscopy (PIA) was used to show that hole transfer occurs from the (CH3NH3)PbI3to the HTMs after excitation of (CH3NH3)PbI3. The electron lifetime (τe) in these devices were rather different, while the charge transport time (ttr) were rather similar. The difference in τecan therefore explain the differences in efficiency of the devices. This report shows that the nature of the HTM is essential for charge recombination and elucidate that finding an optimal HTM for the perovskite solar cell includes controlling the perovskite/HTM interaction.
1 Yang, L.; Xu, B.; Bi, D.; Tian, H.; Boschloo, G.; Sun, L.; Hagfeldt, A.; Johansson, E. M. J. Initial Light Soaking Treatment Enables Hole Transport Material to Outperform Spiro-OMeTAD in Solid-State Dye-Sensitized Solar Cells, J. Am. Chem. Soc. 2013, 135, 7378-7385 2 Bi, D.; Yang, L.; Boschloo, G.; Hagfeldt, A.; Johansson, E. M. J. Effect of Different Hole Transport Materials on Recombination in CH3NH3PbI3 Perovskite-Sensitized Mesoscopic Solar Cells, J. Phys. Chem. Lett. 2013, 4, 1532-1536
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