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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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The article was received on 08 Mar 2016, accepted on 28 Apr 2016 and first published on 28 Apr 2016


Article type: Paper
DOI: 10.1039/C6EE00709K
Energy Environ. Sci., 2016,9, 2326-2333

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    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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