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Issue 10, 2018
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Fluoranthene-based dopant-free hole transporting materials for efficient perovskite solar cells

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Abstract

Significant efforts have been devoted to developing new dopant-free hole transporting materials (HTMs) for perovskite solar cells (PVSCs). Fluoranthene is one typical cyclopentene-fused polycyclic aromatic hydrocarbon with a rigid planarized structure, and thus could be an ideal building block to construct dopant-free HTMs, which have not been reported yet. Here, we report a new and simple synthetic method to prepare unreported 2,3-dicyano-fluoranthene through a Diels–Alder reaction between dibenzofulvene and tetracyanoethylene, and demonstrate that it can serve as an efficient electron-withdrawing unit for constructing donor–acceptor (D–A) type HTMs. This novel building block not only endows the resulting molecules with suitable energy levels, but also enables highly ordered and strong molecular packing in solid states, both of which could facilitate hole extraction and transport. Thus with dopant-free HTMs, impressive efficiencies of 18.03% and 17.01% which are associated with enhanced stability can be achieved based on conventional n–i–p and inverted p–i–n PVSCs respectively, outperforming most organic dopant-free HTMs reported so far.

Graphical abstract: Fluoranthene-based dopant-free hole transporting materials for efficient perovskite solar cells

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Supplementary files

Article information


Submitted
28 Dec 2017
Accepted
01 Feb 2018
First published
02 Feb 2018

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2018,9, 2698-2704
Article type
Edge Article

Fluoranthene-based dopant-free hole transporting materials for efficient perovskite solar cells

X. Sun, Q. Xue, Z. Zhu, Q. Xiao, K. Jiang, H. Yip, H. Yan and Z. Li, Chem. Sci., 2018, 9, 2698
DOI: 10.1039/C7SC05484J

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