V掺杂SnO2染料敏化太阳能电池性能探究

文章研究了钒掺杂对SnO2光阳极的改性效果及其染料敏化太阳电池的应用。通过共沉淀法合成了四种浓度V掺杂SnO2纳米颗粒,分别制成浆料并刮涂于FTO制成四种V/SnO2光阳极膜,封装成电池。在标准太阳光强条件下,跟踪测试相应DSSCs的电池效率24天,发现电池性能随时间逐渐提升。初次测量,掺1mol%V的SnO2开路电压达到0.55V,光电转换效率为1.74%,比无掺杂样品电池高出25%。随后,电池效率缓慢上升。与V-0相比,V浓度高的其电池性能随时间增长的效果更弱,更加缓慢。最终得到电池性能最优的V-0,开路电压0.68V,光电转换提高至3.38%。对四种V/SnO2材料进行表征分析与讨论,并且结合电池的电化学阻抗分析研究电池性能缓慢增长的机理。发现V/SnO2有更致密的表面和宽的能隙,有效抑制复合反应,利于高效DSSCs的实现。后期致密表面抑制电子传输速率,从而增强电池慢增长程度,延长SnO2 DSSCs的生长期。

The modification of SnO2 photoanode by vanadium doping and its application of dye-sensitized solar cells were studied.Four kinds of V doped SnO2 nanoparticles were synthesized by coprecipitation method,and four kinds of V/SnO2 photoanodic films were prepared by slurping and scraping on FTO.Under the condition of standard sunlight intensity,the battery efficiency of DSSCs was tracked and tested for 24 days,and it was found that the battery performance gradually improved with time.At the first measurement,the open circuit voltage of SnO2 doped with 1mol%V reached 0.55v,and the photoelectric conversion efficiency was 1.74%,25%higher than that of the undoped sample battery.Then the efficiency of the battery slowly increased.Compared with V-0(without V doping),the battery performance of high V concentration increases more slowly and weakly with time.Finally,the optimal battery performance of V-0,open circuit voltage 0.68V,photoelectric conversion to 3.38%.The characterization and discussion of four V/SnO2 materials were carried out,and the mechanism of the slow growth of the battery performance was studied by combining with the electrochemical impedance analysis of the battery.It was found that V/SnO2 had denser surface and wider energy gap,which effectively inhibited the complex reaction and was conducive to the realization of efficient DSSCs.In the later stage,the dense surface inhibits the electron transport rate,so as to enhance the slow growth degree of the battery and extend the growth period of SnO2 DSSCs.