Colloidal PbSe Solar Cells with Molybdenum Oxide Modified Graphene Anodes

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• 作者：Hua Wu ; Xiaoyu Zhang ; Yu Zhang ; Long Yan ; Wenzhu Gao ; Tieqiang Zhang ; Yiding Wang ; Jun Zhao ; William W. Yu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 30, 2015
• 年：2015
• 卷：7
• 期：38
• 页码：21082-21088
• 全文大小：351K
• ISSN：1944-8252

文摘

With good electrical conductivity, optical transparency, and mechanical compliance, graphene films have shown great potential in application for photovoltaic devices as electrodes. However, photovoltaic devices employing graphene anodes usually suffer from poor hole collection efficiency because of the mismatch of energy levels between the anode and light-harvesting layers. Here, a simple solution treatment and a low-cost solution-processed molybdenum oxide (MoO_x) film were used to modify the work function of graphene and the interfacial morphology, respectively, yielding highly efficient hole transfer. As a result, the graphene/MoO_x anodes demonstrated low surface roughness and high electrical conductivity. Using the graphene/MoO_x anodes in PbSe nanocrystal solar cells, we achieved 1 sun power conversion efficiency of 3.56%. Compared to the control devices with indium tin oxide anodes, the graphene/MoO_x-based devices show excellent performance, demonstrating the great potential of the graphene/MoO_x anodes for use in optoelectronics.