上转换发光材料La(OH)3:Er3+/Yb3+的制备及在染料敏化太阳能电池中的应用

摘要

It is universally known that N7 1 9 dye can only absorb visible light,which has always been a limitation for its appli-cation in dye-sensitized solar cells (DSSCs).In this study,a rare-earth upconversion luminescent material was introduced to broaden the absorption spectrum of N719 sensitized TiO2photoanodes,enhance light harvesting efficiency,and further improve the perfor-mance of DSSCs devices.Firstly,the upconversion luminescent material of Yb3+/Er3+doped La(OH)3had been successfully synthe-sized via the simple hydrothermal method by controlling the pH values of precursor solution.Then,different contents of these Yb3+/Er3+doped La(OH)3powders were further mixed with P25 for the preparations of TiO2paste.Finally,the TiO2photoanodes with different contents of the upconversion luminescent materials were made by doctor-blade method for further application in DSSCs.As a result,through the introduction of upconversion luminescent materials,the scope of spectral absorption was broadened,and when the doping amount was up to 3%,the highest power conversion efficiency of DSSCs reached 8.3% with the maximum short-circuit current density of 17.72 mA·cm-2.%针对 N719染料仅可吸收可见光这一局限,本研究旨在通过引入上转换发光材料并将其应用于染料敏化太阳能电池的光阳极来拓宽光谱吸收范围,提高光的捕获率,进而达到提高电池光电转换效率的目的.首先,采用水热合成法以不同 pH 值的先驱体溶液,成功制备了Yb3+/Er3+双掺杂La(OH)3粉末,然后将适量合成的稀土发光粉掺入TiO2纳米浆料中,采用刮涂法成膜制备光阳极,并将其组装成染料敏化太阳能电池.研究结果表明,稀土发光粉的加入拓宽了光谱吸收范围,在其掺杂量达到3%时,电池的短路电流密度J sc提高到17.72 mA·cm-2,最终获得了8.3%的光电转换效率.