Abstract
First-time spectroscopic and computational investigations to elucidate the role of a dicationic salt in the optical, electrical and electronic properties of a triarylamine hole transport material, SFX-MeOTAD.
Highlights
Introduction a Smart Materials Research andDevice Technology (SMaRDT) Group, Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, Glasgow, G1 1XL, UK
Perovskite solar cells (PSCs) are layered devices that contain the perovskite absorber sandwiched between an n-type electron transport layer (ETL) and a p-type hole transport layer (HTL)
Conductivity values of the SFX-MeOTAD films doped with varying molar percentages of SFX-(TFSI)[2] were evaluated from the I–V measurements carried out in the dark inside a N2 filled glovebox using a two-point probe method
Summary
Synthesis of SFX-MeOTAD was carried out as reported in the literature.[21] Synthesis of SFX-(TFSI)[2] was similar to that of spiro(TFSI)[2] as reported by Nguyen et al.[8] Briefly, SFXMeOTAD and silver bis(trifluoromethanesulfonyl)imide were mixed in dry dichloromethane under nitrogen. The resulting mixture was diluted with methylene chloride, filtered and the solvent was removed by rotary evaporation. Different concentrations [0–100 mol%] of SFX-(TFSI)[2] were mixed with SFX-MeOTAD in anhydrous chlorobenzene to a combined concentration of 0.15 M. To this 0.12 M 4-tertbutylpyridine was added before spin coating on cleaned glass (for absorbance and conductivity measurements) or FTO coated glass (for XPS and NEXAFS measurements) at 2000 rpm for 1 minute. For conductivity measurements aluminium electrodes (B80 nm) were deposited by thermal evaporation (B10À6 mbar) on doped and undoped SFX-MeOTAD thin films coated on glass
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