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Highly Efficient Inverted Perovskite Solar Cells With Sulfonated Lignin Doped PEDOT as Hole Extract Layer
Ying Wu1,2, Junyi Wang3, Xueqing Qiu1,2
1School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou, China.
Unlabelled:
Sulfonated-acetone-formaldehyde (SAF) was grafted with alkali lignin (AL) to prepare grafted sulfonated-acetone-formaldehyde lignin (GSL). Considering the rich phenolic hydroxyl groups in GSL, we detected a hole mobility of 2.27 × 10(-6) cm(2) V(-1) s(-1) with GSL as a hole transport material by space-charge-limited current model. Compared with nonconjugated poly(styrene sulfonic acid), GSL was applied as p-type semiconductive dopant for PEDOT to prepare water-dispersed
Pedot:
GSL.
Pedot:
GSL shows enhanced conductivity compared with that of
Pedot:
PSS. Simultaneously, the enhanced open-circuit voltage, short-circuit current density, and fill factor are achieved using
Pedot:
GSL as a hole extract layer (HEL) in sandwich-structure inverted perovskite solar cells. The power conversion efficiency is increased to 14.94% compared with 12.6% of
Pedot:
PSS-based devices. Our results show that amorphous GSL is a good candidate as dopant of PEDOT, and we provide a novel prospective for the design of HEL based on lignin, a renewable biomass and phenol derivatives.
