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Issue 7, 2016
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Dopant-free polymeric hole transport materials for highly efficient and stable perovskite solar cells

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Abstract

We report a dopant-free polymeric hole transport material (HTM) that is based on benzo[1,2-b:4,5:b′]dithiophene and 2,1,3-benzothiadiazole, which results in highly efficient and stable perovskite solar cells (∼17.3% for over 1400 h at 75% humidity). The HTM comprises a random copolymer (RCP), which is characterized using UV-vis absorption spectroscopy, cyclic voltammetry, space-charge-limited current, and grazing-incidence wide-angle X-ray scattering. The RCP-based perovskite solar cell exhibits the highest efficiency (17.3%) in the absence of dopants [lithium bis(trifluoromethanesulfonyl)imide and tert-butylpyridine]. The observed efficiency is attributed to a deep HOMO energy level and high hole mobility. In addition, the long-term stability of the device is dramatically improved by avoiding deliquescent or hygroscopic dopants and by introducing a hydrophobic polymer layer. RCP devices maintain their initial efficiency for over 1400 h at 75% humidity, whereas devices made of HTMs with additives fail after 900 h.

Graphical abstract: Dopant-free polymeric hole transport materials for highly efficient and stable perovskite solar cells

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Supplementary files

Article information


Submitted
08 Mar 2016
Accepted
28 Apr 2016
First published
28 Apr 2016

Energy Environ. Sci., 2016,9, 2326-2333
Article type
Paper

Dopant-free polymeric hole transport materials for highly efficient and stable perovskite solar cells

G. Kim, G. Kang, J. Kim, G. Lee, H. I. Kim, L. Pyeon, J. Lee and T. Park, Energy Environ. Sci., 2016, 9, 2326
DOI: 10.1039/C6EE00709K

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