Ultrathin Ammonium Heptamolybdate Films as Efficient Room-Temperature Hole Transport Layers for Organic Solar Cells

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• 作者：Weiming Qiu ; Afshin Hadipour ; Robert M眉ller ; Bert Conings ; Hans-Gerd Boyen ; Paul Heremans ; Ludo Froyen
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：September 24, 2014
• 年：2014
• 卷：6
• 期：18
• 页码：16335-16343
• 全文大小：465K
• ISSN：1944-8252

文摘

Ammonium heptamolybdate (NH₄)₆Mo₇O₂₄路4H₂O (AHM) and its peroxo derivatives are analyzed as solution-processed room temperature hole transport layer (HTL) in organic solar cells. Such AHM based HTLs are investigated in devices with three different types of active layers, i.e., solution-processed poly(3-hexylthiophene)/[6,6]-phenyl C₆₁-butyric acid methyl ester(P3HT/PC₆₀BM), poly[N-9鈥?heptadecanyl-2,7-carbazole-alt-5,5-(4鈥?7鈥?di-2-thienyl-2鈥?1鈥?3鈥?benzothiadiazole)]/[6,6]-phenyl C₇₀-butyric acid methyl ester(PCDTBT/PC₇₀BM) and evaporated small molecule chloro(subphthalocyaninato)boron(III) (SubPc)/C₆₀. By virtue of their high work functions, AHM based HTLs outperform the commonly used poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) HTL for devices employing deep HOMO level active materials. Moreover, devices using AHM based HTLs can achieve higher short circuit current (J_sc) than the ones with evaporated molybdenum oxide(eMoO₃), and thus better power conversion efficiency (PCE). In addition, P3HT/PC₆₀BM devices with AHM based HTLs show air stability comparable to those with eMoO₃, and much better than the ones with PEDOT:PSS.

Keywords:

ammonium heptamolybdate; H₂O₂ modification; room temperature; hole transport layers; organic solar cells