Issue 24, 2020

Lewis-base containing spiro type hole transporting materials for high-performance perovskite solar cells with efficiency approaching 20%

Abstract

Owing to excellent performance and dopability, spiro-OMeTAD remains an irreplaceable hole transporting material (HTM) in perovskite solar cells (PSCs). In order to further improve the performance of spiro-OMeTAD based PSCs, a Lewis base can be introduced into the structure of spiro-OMeTAD wisely, which can keep the advantages of spiro-OMeTAD while incorporating the functionality of a Lewis base in passivating the surface of the perovskite. Therefore, spiro-type HTMs (spiro-CN-OMeTAD with a dicyano group and spiro-PS-OMeTAD with a thiocarbonyl group) were synthesized and confirmed by density functional theory (DFT) calculations and X-ray single-crystallographic diffraction. Spiro-CN-OMeTAD as an HTM is certified to have a suitable interfacial band alignment with the perovskite, good film quality and effective defect passivation, which facilitate the resulting device to achieve an efficiency of 19.90% with a high open-circuit voltage, low hysteresis, and improved stability. This study provides an alternative strategy for the molecular design of better HTMs in high-performance PSCs.

Graphical abstract: Lewis-base containing spiro type hole transporting materials for high-performance perovskite solar cells with efficiency approaching 20%

Supplementary files

Article information

Article type
Paper
Submitted
09 mar. 2020
Accepted
20 may. 2020
First published
21 may. 2020

Nanoscale, 2020,12, 13157-13164

Lewis-base containing spiro type hole transporting materials for high-performance perovskite solar cells with efficiency approaching 20%

J. Xu, L. Liang, C. Mai, Z. Zhang, Q. Zhou, Q. Xiong, Z. Zhang, L. Deng and P. Gao, Nanoscale, 2020, 12, 13157 DOI: 10.1039/D0NR01961E

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