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Cost-Effective Hole Transporting Material for Stable and Efficient Perovskite Solar Cells with Fill Factors up to 82%

Abstract

A new small molecule-based hole selective material (HSM), 4,4',4''-(7,7',7''-(5,5,10,10,15,15-Hexahexyl-truxene-2,7,12-triyl)tris(2,3-dihydrothieno[3,4-b][1,4]dioxine-7,5-diyl))tris(N,N-bis(4-methoxyphenyl)aniline) (TRUX-E-T), has been developed by a facile synthesis with reduced cost. The highest occupied molecular orbital energy level and lowest unoccupied molecular orbital energy level of TRUX-E-T are -5.10 and -2.50 eV, respectively, making it a suitable HSM for lead iodide perovskite solar cells. TRUX-E-T can be smoothly deposited onto perovskite layers, enabling efficient perovskite solar cells with thin TRUX-E-T layers (~50 nm), which helps cut the unit cost of the HSL used in PVSCs to approximately one-fortieth (1/40) of 2,2′,7,7′-Tetrakis (N,N-di-p-methoxyphenylamino)-9,9′-spirobifluorene (spiro-OMeTAD). Additionally, TRUX-E-T exhibits hole mobility as high as 2.47×10-4 cm2/Vs, better than spiro-OMeTAD. As a result, our perovskite solar cells using TRUX-E-T have shown high fill factors up to 82%. The champion cell achieved a maximum power conversion efficiency of 18.35% (16.44%) when measured under reverse (forward) voltage scan under AM1.5 G 100 mW/cm2 illumination. Our un-encapsulated cells exhibited good stability in ambient air, maintaining 96.4% of their initial efficiency of 18.35% after 20 days storage.

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Publication details

The article was received on 13 Sep 2017, accepted on 09 Oct 2017 and first published on 10 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA08053K
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Cost-Effective Hole Transporting Material for Stable and Efficient Perovskite Solar Cells with Fill Factors up to 82%

    L. Guan, X. Yin, D. Zhao, C. Wang, Q. An, J. Yu, N. Shrestha, C. Grice, R. Awni, Y. Yu, Z. Song, J. Zhou, W. Meng, F. Zhang, R. Ellingson, J. Wang, W. Tang and Y. Yan, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08053K

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