Construction of Layered Structure of Anion-Cations To Tune the Work Function of Aluminum-Doped Zinc Oxide for Inverted Polymer Solar Cells

ACS Applied Materials & Interfaces
Weitao MaYuguang Ma

Abstract

Suitable work function (WF) of the cathode in polymer solar cells (PSCs) is of essential importance for the efficient electron extraction and collection to boost the power conversion efficiency. Herein, we report a facile and efficient method to tune the surface WF of aluminum-doped zinc oxide (AZO) through building of a definite interfacial dipole, which is realized by the construction of a layered structure of positive and negative ionized species. A cross-linked perylene bisimide (poly-PBI) thin film is deposited onto the AZO surface first, and then it is reduced to the radical anion state (poly-PBI•-) in an electrochemical cell, using tetraoctylammonium (TOA+), a bulky cation, as a counter ion. Owing to the huge volume of TOA+, it is absorbed on the surface of the cross-linked PBI•- thin film through Coulomb force, and thus a definite interface dipole is formed between the two ionized layers. Because of the definite interface dipole, the surface WF of the electrode modified with ionized layers is decreased dramatically to 3.9 eV, which is much lower than that of the electrode modified with the neutral PBI layer (4.5 eV). By using this novel cathode interlayer with a definite interface dipole in PSCs, a significantly increas...Continue Reading

References

Nov 9, 2011·ACS Applied Materials & Interfaces·Alexander W HainsBrian A Gregg
Mar 2, 2013·Advanced Materials·Aung Ko Ko KyawAlan J Heeger
Oct 12, 2013·Advanced Materials·Bo Ram LeeMyoung Hoon Song
Nov 14, 2014·Angewandte Chemie·David SchmidtFrank Würthner
May 29, 2015·Journal of the American Chemical Society·Li NianYuguang Ma
Sep 12, 2015·ACS Applied Materials & Interfaces·Wenwen DengHanxi Yang
Nov 4, 2016·Chemical Communications : Chem Comm·Weitao MaYuguang Ma

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