不同基底对电沉积制备ZnO纳米棒薄膜光电转换性能的影响
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摘要
选取不同的导电支撑物(FTO、ITO、不锈钢网、Ni网)作为基底,在其表面采用相同的电沉积参数制备得到ZnO纳米棒薄膜,详细探讨了不同基底物理化学性质对ZnO基光阳极形貌及光电性能的影响。研究表明:以Zn Cl2与O_2为前驱体,分别在未做预处理的空白FTO、ITO、Ni网、不锈钢网上施加-1.0 V的沉积电位,反应3600 s后均可得到棒状结构的ZnO纳米薄膜,但纳米棒的直径、密度以及结晶性相差较大。经紫外漫反射测试发现,虽然各基底上ZnO纳米薄膜对太阳光的响应范围相一致,但玻璃基底相较于柔性金属网基底具有较小的禁带宽度,电子跃迁所需能量较小。此外,I-V测试结果表明基于玻璃基底的ZnO基DSSC相较于柔性金属丝网基光阳极具有较大的光电转化效率,最高可达0.38%。
ZnO nanorod arrays( ZNRAs) were prepared in large-scale on different substrates including FTO,ITO,flexible Ni mesh and stainless steel mesh( SSM) by the electrodeposition method. The aim of this study was to investigate the effects of substrate on electrodepositing ZNRAs. It was found that the diameter,density and crystallinity of ZNRAs show obvious difference,when the potential was controlled at-1. 0 V for 3600 s by using the Zn Cl2 solution saturated with oxygen as electrolyte. It was also found by the UV test that although the ZnO nanofilms on each substrate show similar response range to the sun light,the ZNRAs base on glass substrates compared with flexible wire mesh show smaller band gap.Moreover,the DSSCs based on ZNRAs using the glass substrate display better overall conversion efficiency than that on flexible wire mesh,which can reach to 0. 38%.
ZnO nanorod arrays( ZNRAs) were prepared in large-scale on different substrates including FTO,ITO,flexible Ni mesh and stainless steel mesh( SSM) by the electrodeposition method. The aim of this study was to investigate the effects of substrate on electrodepositing ZNRAs. It was found that the diameter,density and crystallinity of ZNRAs show obvious difference,when the potential was controlled at-1. 0 V for 3600 s by using the Zn Cl2 solution saturated with oxygen as electrolyte. It was also found by the UV test that although the ZnO nanofilms on each substrate show similar response range to the sun light,the ZNRAs base on glass substrates compared with flexible wire mesh show smaller band gap.Moreover,the DSSCs based on ZNRAs using the glass substrate display better overall conversion efficiency than that on flexible wire mesh,which can reach to 0. 38%.
引文
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[3]Kakiage K,Aoyama Y,Yano T,et al.Highly-efficient Dye-sensitized Solar Cells with Collaborative Sensitization by Silyl-anchor and Carboxyanchor Dyes[J].J.Chem.Commun.,2015,51(88):15894-15897.
[4]Zhang Q,Chou T P,Russo B,et al.Aggregation of Zn O Nanocrystallites for High Conversion Efficiency in Dye-sensitized Solar Cells[J].Angew.Chem.Int.Ed.Engl.,2008,47(13):2402-2406.
[5]Lu H,Zheng F,Guo M,et al.One-step Electrodeposition of Single-crystal Zn O Nanotube Arrays and Their Optical Properties[J].J.Alloys Compd,2014,588:217-221.
[6]Wang M D,Xing C C,Cao K,et al.Alignment-controlled Hydrothermal Growth of Well-aligned Zn O Nanorod Arrays[J].Journal of Physics and Chemistry of Solids,2014,75(7):808-817.
[7]Park J,Park J.Synthesis of Ultrawide Zn O Nanosheets[J].Current Applied Physics,2006,6(6):1020-1023.
[8]Qiu J H,Guo M,Wang X D.Electrodeposition of Hierarchical Zn O Nanorod-nanosheet Structures and Their Applications in Dye-sensitized Solar Cells[J].Applied Materials&Interfaces,2011,3(7):2358-2367.
[9]Yilmaz C,Unal U.Synthesis and Characterization of Hierarchical Zn O Structures by a Single-step Electrodeposition under Hydrothermal Conditions[J].Electrochimica Acta,2014,123:405-411.
[10]Vergés M A,Mifsud A,Serna C J.Formation of Rod-like Zinc Oxide Microcrystals in Homogeneous Solutions[J].Journal of the Chemical Society,Faraday Transactions,1990,6:959-963.
[11]Wang X D,Summers C J,Wang Z L.Large-scale Hexagonal-patterned Growth of Aligned Zn O Nanorods for Nano-optoelectronics and Nanosensor Arrays[J].Nano Letters,2004,4(3):423-426.
[12]Lee S,Umar A,Kim S H,et al.Growth of Zn O Nanoneedles on Silicon Substrate by Cyclic Feeding Chemical Vapor Deposition:Structural and Optical Properties[J].Korean Journal of Chemical Engineering,2007,24(6):1084-1088.
[13]Kim H W,Kim N H,Lee C.Very Low Temperature Growth of Zn O Thin Films on Si Substrates Using the Metalorganic Chemical Vapor Deposition Technique[J].Journal of the Korean Physical Society,2004,44:14-17.
[14]Hou Q,Zhu L Q,Chen H N,et al.Growth of Flower-like Porous Zn O Nanosheets by Electrodeposition with Zn5(OH)8(NO3)2·2H2O as Precursor[J].Electrochimica Acta,2012,78:55-64.
[15]Qin Z,Zhang G J,Liao Q L,et al.Influences of Low Temperature Thermal Treatment on Zn O Nanowire Arrays and Nanoparticles Based Flexible Dye-sensitized Solar Cells[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2012,402:127-131.
[16]Gao R,Tian J,Liang Z,et al.Nanorod-nanosheet Hierarchically Structured Zn O Crystals on Zinc Foil as Flexible Photoanodes for Dye-sensitized Solar Cells[J].Nanoscale,2013,5(5):1894-1901.
[17]Lee C,Lee W,Li W,et al.St St/Ti O2Compact Layer/Ti O2Triple-layered Conducting Substrates for Large Active Area Dye-sensitized Solar Cells[J].Materials Research Bulletin,2013,48(7):2625-2629.
[18]Chae Y,Park J T,Koh J K,et al.All-solid,Flexible Solar Textiles Based on Dye-sensitized Solar Cells with Zn O Nanorod Arrays on Stainless Steel Wires[J].Materials Science and Engineering:B,2013,178(17):1117-1123.
[19]Fan K,Zhang W,Peng T Y,et al.Application of Ti O2Fusiform Nanorods for Dye-sensitized Solar Cells with Significantly Improved Eficiency[J].The Journal of Physical Chemistry C,2011,115(34):17213-17219.