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Issue 7, 2015
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A simple spiro-type hole transporting material for efficient perovskite solar cells

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Abstract

We developed a cost-effective spiro-type 4,4′,4′′,4′′′\-(2H,2′H,4H,4′H-3,3′-spiro-bi[thieno[3,4-b][1,4]dioxepine]-6,6′,8,8′-tetrayl)tetrakis(N,N-bis(4-methoxyphenyl)aniline) hole transporting material (PST1) for perovskite solar cells (PSCs) that works efficiently even without a cobalt dopant. The PST1 is obtained by employing facile synthetic routes and tends to crystallize in the solid state. An X-ray diffraction study of PST1 revealed a unique quasi-spiro molecular configuration and found multiple CH/π and π–π intermolecular contacts. For the first time, the crystal structure of 2,2′,7,7′-tetrakis(N,N′-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD) is also studied for comparison. The device based on PST1 exhibited a PCE of 13.44%, and a comparable 12.74% PCE was achieved for its undoped form, which paves the way for developing new low cost hole transporting materials and final industrialization of perovskite solar cells.

Graphical abstract: A simple spiro-type hole transporting material for efficient perovskite solar cells

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Supplementary files

Article information


Submitted
29 Nov 2014
Accepted
21 Apr 2015
First published
21 Apr 2015

Energy Environ. Sci., 2015,8, 1986-1991
Article type
Communication
Author version available

A simple spiro-type hole transporting material for efficient perovskite solar cells

P. Ganesan, K. Fu, P. Gao, I. Raabe, K. Schenk, R. Scopelliti, J. Luo, L. H. Wong, M. Grätzel and M. K. Nazeeruddin, Energy Environ. Sci., 2015, 8, 1986
DOI: 10.1039/C4EE03773A

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