Crystal Morphology of Anatase Titania Nanocrystals Used in Dye-Sensitized Solar Cells
Crystal Morphology of Anatase Titania Nanocrystals Used in Dye-Sensitized Solar Cells
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DOI：
10.1021/cg070232a
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发表时间：
2008
影响因子：
3.8
通讯作者：
Jihuai Wu;Sancun Hao;Jian-ming Lin;Miaoliang Huang;Yunfang Huang;Z. Lan;Pinjiang Li
中科院分区：
文献类型：
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作者：
Jihuai Wu;Sancun Hao;Jian-ming Lin;Miaoliang Huang;Yunfang Huang;Z. Lan;Pinjiang Li
以异丙醇钛为原料，在酸性或碱性条件下水热条件下进行晶体生长，合成了锐钛矿型纳米二氧化钛。采用X射线衍射仪、透射电子显微镜、高分辨透射电子显微镜、傅立叶变换红外光谱、差示扫描量热法等手段研究了纳米二氧化钛的晶相、晶型、表面取向以及其光伏性能。结果表明，与硝酸法制备的四方球状锐钛矿型二氧化钛纳米晶相比，在四甲基氢氧化铵中制备的锐钛矿型二氧化钛纳米晶具有更多的{101}晶面，呈现出双锥棒状结构。晶型和表面取向对锐钛矿-金红石相变温度影响较大，棒状锐钛矿相变温度约为950℃，球形锐钛矿相变温度约为700℃。采用棒状锐钛矿型染料敏化太阳能电池的光电转换效率为6.2%，采用球状锐钛矿型染料敏化太阳能电池的光电转换效率为5.4%。
Anatase TiO2 nanocrystals were synthesized by hydrolysis of titanium isopropoxide followed by crystal growth under hydrothermal conditions in an acidic or basic environment. The crystal phase, crystal shape, and surface orientation of the TiO2 nanocrystals, as well as the photovoltaic performance of DSSCs, was studied by XRD, TEM, HRTEM, FTIR, and DSC-TG. It was found that anatase TiO2 nanocrystals prepared in tetramethylammonium hydroxide contained more {101} faces and presented a bipyramidal rod-like shape in comparison with the anatase TiO2 nanocrystal with a tetragonal ball-like shape prepared in nitric acid. The anatase-to-rutile phase transition temperature was largely affected by the crystal shape and surface orientation; it was about 950 °C for rod-like anatase and 700 °C for ball-like anatase. A 6.2% photoelectric conversion efficiency was obtained from the dye-sensitized solar cell (DSSC) with rod-like anatase, and a 5.4% the efficiency was obtained from the DSSC with ball-like anatase, which me...