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近年来钙钛矿材料CH3NH3Pb X3(X=Cl,I,Br)因其在可见光范围的吸光系数大、成本低廉、能量转换效率高等优势而得到快速发展.本文采用低温化学水浴沉积制备出有序的Zn O纳米阵列,进一步在Zn O纳米阵列上旋涂不同体系的Ti O2,制备出Zn O/Ti O2复合阵列结构作为钙钛矿太阳能电池的电子传输层,通过改变Ti O2掺入体系探究电极的微结构变化和电池光电性能.研究表明,Zn O纳米阵列经过Ti O2浆料处理的复合体系组装的电池具有最优的光电性能,进一步考察Ti O2浆料浓度对电池性能的影响表明,当Ti O2浓度为0.1 mol/L时得到最佳性能,其组装电池的开路电压(Voc)达到0.93 V,短路电流(Jsc)为15.30 m A cm-2,填充因子(FF)为43%,效率(η)为6.07%.效率的提升主要是因为钙钛矿能深入Zn O阵列的间隙,同时在阵列的上部形成了均匀致密的覆盖层,有效提高了电池的光俘获,同时抑制了载流子的复合.在Zn O/Ti O2浆料复合阵列结构优化浆料浓度的基础上,进一步对纳米阵列采用Ti Cl4溶液进行处理,电池的光电性能得到大幅提升:Voc=0.99 V,Jsc=19.09 m A cm-2,FF=58%,效率η达到11%.性能提升的原因主要是Ti Cl4溶液对复合纳米阵列的处理,引入了小Ti O2纳米颗粒到Zn O/Ti O2浆料复合阵列结构中,有效地填补了阵列中的间隙,后续旋涂钙钛矿材料,阵列上部的钙钛矿覆盖层和间隙中的钙钛矿纳米晶,其光照后产生的载流子都可以与电子传输层有很好的接触,从而快速地经由Zn O阵列传导至导电衬底,此外小纳米颗粒的引入,也增大了电极的表面积,提高了对钙钛矿物质的吸附,增大了光俘获,因而电池的整体性能都得到提高.
In recent years, perovskite material CH3NH3Pb X3 (X = Cl, I, Br) has been rapidly developed due to its large absorption coefficient in the visible range, low cost and high energy conversion efficiency.In this paper, Of Zn O nano-array, Zn O / Ti O2 composite array structure was further spin-coated on the Zn O nano-array as the electron transport layer of perovskite solar cells by changing Ti O2 into the system The microstructure of the electrode and the photoelectric properties of the battery were studied.The results show that the battery assembled with Zn O nano-array after Ti O2 slurry treatment has the best optoelectronic properties and the further investigation of the effect of Ti O2 concentration on the battery performance shows that, When the concentration of Ti O2 is 0.1 mol / L, the best performance is obtained. The open circuit voltage (Voc) of assembled battery reaches 0.93 V, Jsc is 15.30 m A cm-2, the fill factor (FF) is 43% The efficiency (η) is 6.07%. The improvement of efficiency is mainly attributed to the fact that perovskite can penetrate into the gap of Zn O array and form a uniform and dense coating on the upper part of the array, which effectively improves the light trapping of the battery, Complex of atoms. In Zn O / Ti O2 slurry composite array structure on the basis of the optimized slurry concentration, further treatment of the nano-array TiCl4 solution, the photovoltaic properties of the battery has been greatly improved: Voc = 0.99 V, Jsc = 19.09 mAcm-2, FF = 58% and η = 11% .The main reason for the performance improvement is the treatment of composite nanocrystal with TiCl4 solution, the introduction of small Ti O2 nanoparticles into Zn O / Ti O2 slurry composite array structure, effectively filling The gap in the array, followed by spin-on perovskite material, the perovskite coating in the upper portion of the array, and the perovskite nanocrystals in the gap, all of which produce carriers that are sufficiently bright with respect to the electron transport layer So as to be rapidly conducted to the conductive substrate via the ZnO array. In addition, the introduction of small nano-particles also increases the surface area of the electrode, increases the adsorption of the perovskite, and increases the light trapping. Therefore, the whole battery Performance has been improved.