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光捕获和电子复合决定着量子点敏化太阳电池的光电效率(PCE).众所周知,在纳米棒阵列的量子点敏化太阳电池中电荷更容易传输.然而,氧化锌(ZnO)阵列表面的缺陷会引起电荷快速复合.因此,我们利用H_3BO_3和(NH_4)_2TiF_6溶液合成了正交结构的二氧化钛(TiO2)纳米粒子并用其对ZnO纳米棒包覆,形成了复合纳米结构.该结构利用了纳米颗粒提供的大比表面积以及纳米棒优良的电子传输特性,以期获得良好的电荷传输和光捕获能力.同时,由于TiO_2修饰后的ZnO纳米棒阵列的表面复合中心(羟基)较少,ZnO纳米棒表面上发生的电荷俘获减少,从而降低了电荷复合,延长了电子寿命.TiO_2修饰后太阳电池的PCE达到4.80%,比未修饰电池的PCE(2.7%)提高了约78%.
Light harvesting and electron recombination determine the photoelectric efficiency (PCE) of quantum dot-sensitized solar cells.It is well known that charge is more easily transported in nanoscaled array quantum dot-sensitized solar cells.However, defects on the surface of zinc oxide (ZnO) arrays We can synthesize the titania (TiO2) nanoparticles with orthogonal structure by H_3BO_3 and (NH_4) _2TiF_6 solutions and coat them with ZnO nanorods to form composite nanostructures, which utilize the nano-particles And the excellent electron transport properties of nanorods are obtained in order to obtain good charge transport and light trapping ability.At the same time, due to the small surface recombination centers (hydroxyl groups) of TiO 2 -modified ZnO nanorod arrays, the surface of ZnO nanorods The charge trapping is reduced, which reduces the charge recombination and prolongs the life of the electron.The PCE of the solar cell after the modification of TiO 2 is 4.80%, which is about 78% higher than that of the non-modified PCE (2.7%).