Highly flexible, conductive and transparent MoO₃/Ag/MoO₃ multilayer electrode for organic photovoltaic cells

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• 作者：T. Abachi ; L. Cattin ; G. Louarn ; Y. Lare ; A. Bou ; M. Makha ; P. Torchio ; M. Fleury ; M. Morsli ; M. Addou ; J.C. Bern¨¨de
• 关键词：Flexible substrate ; ITO-free electrode ; MoO3/Ag/MoO3 electrode ; Organic solar cell
• 刊名：Thin Solid Films
• 出版年：2013
• 出版时间：31 October, 2013
• 年：2013
• 卷：545
• 期：Complete
• 页码：438-444
• 全文大小：1461 K

文摘

MoO₃/Ag/MoO₃(MAM) multilayer structures were deposited by vacuum evaporation on polyethylene terephthalate (PET) substrate. We demonstrate that, as in the case of glass substrate, the sheet resistance of such structures depends significantly on the Ag film deposition rate. When it is deposited between 0.2 and 0.4 nm/s, an Ag thickness of 11 nm allows achieving sheet resistance of 13 ¦¸/sq and an averaged transmission of 74 % . A study of the influence of the PET substrate on the optimum MoO₃ thicknesses was done. A good qualitative agreement between the theoretical calculations of the variation of the optical transmittance of the MoO₃/Ag/MoO₃ structures is obtained. The optimum MAM structures MoO₃ (17.5 nm)/Ag (11 nm)/MoO₃ (35 nm) has a factor of merit F_M = 4.21 10^? 3 (¦¸/sq)^? 1. Proven by the scotch test the MAM structures exhibit a good adhesion to the PET substrates. The MAM structures were also submitted to bending tests. For outer bending, the samples exhibit no variation of their resistance value, while for inner bending there is a small increase of the resistance of the MAM structures. However this increasing is smaller than that exhibited by Indium Tin Oxide. When the PET/MAM structures are used as anode in organic photovoltaic cells, it is shown that the need to use thicker Ag films inside the multilayer and to cover the MAM with Au to obtain promising Current density vs Voltage characteristics is due to the heating of the PET substrate during the deposition process.