Abstract This paper presents a simple and large area wet chemical preparation route for molybdenum diselenide (MoSe2) atomic layers. MoSe2 was synthesized onto fluorine doped tin oxide substrates and could be directly used as a counter electrode (CE) for dye-sensitized solar cells (DSSCs). The role of deposition time on the growth of MoSe2 CE was elaborately discussed using Raman, X-ray diffraction and photoluminescence studies. Influence of wet chemical growth time on the surface modification of MoSe2 CE was evidently demonstrated by scanning electron microscopy and atomic force microscopy studies. The MoSe2 CE electrode has lower charge transfer resistance and superior electrocatalytic activity towards triiodide/iodide redox behavior, comparable to conventional Pt CEs. High power conversion efficiency of 7.28% was achieved, equivalent to scarce noble metal Pt CE (7.40%). Uniform surface morphology with active edge sites highly dominated to promote the superior electrocatalytic activity. This work opens a way to use an economical wet chemical method to fabricate the layered MoSe2 CE as a replacement for high cost Pt based CE for DSSCs.

中文翻译：

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利用湿化学法合成MoSe2对电极构建染料敏化太阳能电池

摘要 本文提出了一种简单的大面积湿法化学制备二硒化钼（MoSe2）原子层的方法。MoSe2 被合成到氟掺杂的氧化锡衬底上，可直接用作染料敏化太阳能电池 (DSSC) 的对电极 (CE)。使用拉曼、X 射线衍射和光致发光研究详细讨论了沉积时间对 MoSe2 CE 生长的作用。扫描电子显微镜和原子力显微镜研究清楚地证明了湿化学生长时间对 MoSe2 CE 表面改性的影响。MoSe2 CE 电极对三碘化物/碘化物氧化还原行为具有较低的电荷转移电阻和优异的电催化活性，与传统的 Pt CE 相当。实现了 7.28% 的高功率转换效率，相当于稀有的贵金属 Pt CE (7.40%)。具有活性边缘位点的均匀表面形态高度占主导地位，以促进优异的电催化活性。这项工作开辟了一种使用经济的湿化学方法来制造层状 MoSe2 CE 作为 DSSC 的高成本 Pt 基 CE 的替代品的方法。