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Issue 21, 2017
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A comparative study of o,p-dimethoxyphenyl-based hole transport materials by altering π-linker units for highly efficient and stable perovskite solar cells

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Abstract

Two easily synthesized o,p-dimethoxyphenyl-based hole transport materials (HTMs) containing biphenyl (HL-1) and carbazole (HL-2) in the π-system, respectively, have been designed and studied for perovskite solar cells (PSCs). A higher efficiency of 18.34% for the HL-2 based device was obtained compared to that of HL-1 showing a lower efficiency of 16.14%. A small hysteresis was also observed in the HL-2 based device while the HL-1 based device displayed a significant hysteresis. As a carbazole unit has a stronger electron-donating ability than biphenyl, HL-2 shows a higher hole mobility. The steady-state photoluminescence characteristics confirm that HL-2 can efficiently extract charge carrier at the perovskite/HTM interface rather than HL-1. Meanwhile, a compact HL-2 film without pin-holes effectively suppressed the non-radiative recombination at the interface, resulting in the improvement of the fill factor and open voltage. Most importantly, the steric hindrance due to the long hexyl chain of HL-2 could restrain the halogen migration from the perovskite to the Ag electrode. Thus, the HL-2 based device without encapsulation showed an advanced thermal stability at 85 °C after storing for 100 h compared to the HL-1. These results indicate that the o,p-dimethoxyphenyl unit is a promising alternative to develop small molecular HTMs for highly efficient and stable PSCs.

Graphical abstract: A comparative study of o,p-dimethoxyphenyl-based hole transport materials by altering π-linker units for highly efficient and stable perovskite solar cells

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Publication details

The article was received on 23 Mar 2017, accepted on 28 Apr 2017 and first published on 28 Apr 2017


Article type: Paper
DOI: 10.1039/C7TA02556D
Citation: J. Mater. Chem. A, 2017,5, 10480-10485
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    A comparative study of o,p-dimethoxyphenyl-based hole transport materials by altering π-linker units for highly efficient and stable perovskite solar cells

    X. Li, M. Cai, Z. Zhou, K. Yun, F. Xie, Z. Lan, J. Hua and L. Han, J. Mater. Chem. A, 2017, 5, 10480
    DOI: 10.1039/C7TA02556D

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