Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
Publication date: 11th July 2022
It is widely known that a supporting hole transporting material is used in a perovskite solar cell (PSCs) to improve the device efficiency. The conventional material is 2,2',7,7'-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene (spiro-OMeTAD) has several drawbacks. One of them the requirement of hydrophilic additives which can enhance its conductivity and mobility. With the purpose to overcome those drawbacks, we developed three new derivatives of dibenzothiophene and conducted a comprehensive study of their properties including absorption, photoluminescence, photoemission, cyclic voltammetry, charge mobility and molecular dynamics (MD) [1]. The charge extraction by linearly increasing voltage (CELIV) and time-of-flight (TOF) techniques were employed to measure the hole mobility of dibenzothiophene derivatives as a function of electric field and temperature. We observed that the hole mobility has no major impact on the performance of the solar cell. Based upon the Gaussian disorder model the hole mobility the parameters of diagonal and off-diagonal (positional) disorder were extracted. In parallel, the parameters for positional disorder (interstice, orientational, and torsional disorder) were determined via MD studies. The results of the mobility measurements and MD studies are mutually consistent regarding positional disorder. The dopant-free PSCs with one of the synthesized derivatives dibenzothiophene exhibited efficiency slightly above of 20% which was much higher than that of dopant-free spiro-OMeTAD-based reference device. This result is consistent with both appropriate hole density dynamics characterized by “effective” hole recombination rate of 11.8 ms-1 and hole-transporting properties with hole mobility of 9.45×10-4 cm2/Vs of the derivative of dibenzothiophene.
This project has received funding in the frame of the program SMART-ER Seed Project (“T-i-PSCer” No V22/02/36).
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