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A mixed hole transport material employing a highly planar conjugated molecule for efficient and stable perovskite solar cells

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Abstract

We successfully demonstrated a simple and facile way to improve the efficiency and stability of perovskite solar cells using a mixed hole transport material, which was a composite of spiro-OMeTAD and a conjugated small molecule, DRSBDT-2OT. DRSBDT-2OT, with an acceptor–donor–acceptor (A–D–A) structure, exhibits a high molecular planarity via noncovalent intramolecular S⋯O interactions, leading to comparatively low reorganization energy and high hole mobility. Owing to the surface passivation effects of DRSBDT-2OT in the mixed HTM and the increased hole mobility in comparison with the spiro-OMeTAD, the mixed HTM-based device exhibits a significantly enhanced efficiency of 21.31%, which is much higher than that of single-component HTM-based devices. Furthermore, the mixed HTM-based devices are much more stable than the control devices that use Sprio-OMeTAD as the HTM. These findings pave the way for the rational design of planar hole-transport materials for mixed HTMs toward efficient and stable perovskite solar cells.

Graphical abstract: A mixed hole transport material employing a highly planar conjugated molecule for efficient and stable perovskite solar cells

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Article information


Submitted
06 Dec 2019
Accepted
06 Feb 2020
First published
07 Feb 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

A mixed hole transport material employing a highly planar conjugated molecule for efficient and stable perovskite solar cells

X. Ji, T. Zhou, X. Ke, W. Wang, S. Wu, M. Zhang, D. Lu, X. Zhang and Y. Liu, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA13365H

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