"Secondary Growth" in Hydrothermal Synthesis of Aligned ZnO Nanostructures and Its Application in Dye-Sensitized Solar Cells
"Secondary Growth" in Hydrothermal Synthesis of Aligned ZnO Nanostructures and Its Application in Dye-Sensitized Solar Cells
复制标题
水热合成定向ZnO纳米结构的“二次生长”及其在染料敏化太阳能电池中的应用
DOI：
10.1166/jnn.2016.11886
复制
发表时间：
2016
影响因子：
--
通讯作者：
Lu Youming
中科院分区：
文献类型：
--
作者：
Liu Wenjun;Huang Qiaoling;Huang Tengji;Cao Peijiang;Han Shun;Jia Fang;Zhu Deliang;Ma Xiaocui;Lu Youming
以硝酸锌和六次甲基四胺（HMT）为前驱物，采用低温水热法在ZnO薄膜晶种衬底上制备了一维（1D）取向的ZnO纳米结构。据观察，增加的浓度比的Zn 2 +/HMT从1到100导致的“二次生长”，并在ZnO纳米结构的形貌的变化，从阵列的厚纳米棒的薄纳米棒-步骤-厚的纳米棒的阵列。在高Zn 2 +/HMT浓度比下，随着生长时间的增加，ZnO纳米结构的形态演变表现出相同的转变。以ZnO纳米结构为光阳极制备了染料敏化太阳能电池（DSSC），利用电化学阻抗谱（EIS）研究了DSSC的电子输运特性。虽然DSSC由于长度短而显示出较低的功率转换效率，但薄纳米棒阵列表现出优异的电子传输，电子扩散系数（Dn）为1.57×10−3 cm 2/s，有效扩散长度（Ln）为140 μm。
One-dimensional (1D) aligned ZnO nanostructures were prepared on ZnO film seeded substrates using a low-temperature hydrothermal method, and zinc nitrate and hexamethylenetetramine (HMT) precursors. It was observed that increasing the concentration ratio of Zn2+/HMT from 1 to 100 led to a “secondary growth,” and a change in the morphologies of the ZnO nanostructures from arrays of thick nanorods to arrays of thin nanorod-step-thick nanorods. The morphological evolution of ZnO nanostructures with increased growth time at high Zn2+/HMT concentration ratios showed the same transformation. Dye-sensitized solar cells (DSSCs) were fabricated using ZnO nanostructures as the photoanodes, and the electron transport properties were determined by electrochemical impedance spectroscopy (EIS). Although the DSSCs showed low power conversion efficiencies due to the short lengths, the arrays of the thin nanorods demonstrated excellent electron transport with an electron diffusion coefficient (Dn ) of 1.57×10−3 cm2/s, and an effective diffusion length (Ln ) of 140 μm.