Pore-Filling of Spiro-OMeTAD in Solid-State Dye Sensitized Solar Cells: Quantification, Mechanism, and Consequences for Device Performance
نویسندگان
چکیده
In this paper, the pore filling of spiro-OMeTAD (2,2(,7,7(-tetrakis-(N,N-di-pmethoxyphenylamine)9,9(-spirobifluorene) in mesoporous TiO2 films is quantified for the first time using XPS depth profiling and UV–Vis absorption spectroscopy. It is shown that spiro-OMeTAD can penetrate the entire depth of the film, and its concentration is constant throughout the film. We determine that in a 2.5-mm-thick film, the volume of the pores is 60–65% filled. The pores become less filled when thicker films are used. Such filling fraction is much higher than the solution concentration because the excess solution on top of the film can act as a reservoir during the spin coating process. Lastly, we demonstrate that by using a lower spin coating speed and higher spiro-OMeTAD solution concentration, we can increase the filling fraction and consequently the efficiency of the device.
منابع مشابه
Melt-infiltration of spiro-OMeTAD and thermal instability of solid-state dye-sensitized solar cells.
A method for achieving complete pore-filling in solid-state dye-sensitized solar cells termed melt-infiltration is presented: after the customary solution-processed deposition of spiro-OMeTAD, the device is heated above the glass transition temperature of spiro-OMeTAD to soften the material and allow capillary action to pull additional spiro-OMeTAD from the overlayer reservoir into the pores. T...
متن کاملThe Effect of Hole Transport Material Pore Filling on Photovoltaic Performance in SolidState DyeSensitized Solar Cells
A detailed investigation of the effect of hole transport material (HTM) pore fi lling on the photovoltaic performance of solid-state dye-sensitized solar cells (ss-DSCs) and the specifi c mechanisms involved is reported. It is demonstrated that the effi ciency and photovoltaic characteristics of ss-DSCs improve with the pore fi lling fraction (PFF) of the HTM, 2,2’,7,7’-tetrakis-( N , N -dip -m...
متن کاملEnhancing the hole-conductivity of spiro-OMeTAD without oxygen or lithium salts by using spiro(TFSI)₂ in perovskite and dye-sensitized solar cells.
2,2',7,7'-Tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD), the prevalent organic hole transport material used in solid-state dye-sensitized solar cells and perovskite-absorber solar cells, relies on an uncontrolled oxidative process to reach appreciable conductivity. This work presents the use of a dicationic salt of spiro-OMeTAD, named spiro(TFSI)2, as a facile means ...
متن کاملHole transport materials with low glass transition temperatures and high solubility for application in solid-state dye-sensitized solar cells.
We present the synthesis and device characterization of new hole transport materials (HTMs) for application in solid-state dye-sensitized solar cells (ssDSSCs). In addition to possessing electrical properties well suited for ssDSSCs, these new HTMs have low glass transition temperatures, low melting points, and high solubility, which make them promising candidates for increased pore filling int...
متن کاملDeposition of hole-transport materials in solid-state dye-sensitized solar cells by doctor-blading
We report using doctor-blading to replace conventional spin coating for the deposition of the hole-transport material spiro-OMeTAD (2,20 ,7,70-tetrakis-(N,N-di-p-methoxyphenylamine)-9,90-spirobifluorene) in solid-state dye-sensitized solar cells. Doctor-blading is a roll-to-roll compatible, large-area coating technique, is capable of achieving the same spiro-OMeTAD pore filling fraction as spin...
متن کامل