Alarcón H, Boschloo G, Mendoza P, Solis J L, Hagfeldt A
Facultad de Ciencias, Universidad Nacional de Ingeniería, P.O. Box 31-139, Lima, Peru.
J Phys Chem B. 2005 Oct 6;109(39):18483-90. doi: 10.1021/jp0513521.
Nanocrystalline TiO2 films, surface modified with Al3+, were manufactured by depositing a TiO2 suspension containing small amounts of aluminum nitrate or aluminum chloride onto conducting glass substrates, followed by drying, compression, and finally heating to 530 degrees C. Electrodes prepared with TiO2 nanoparticles coated with less than 0.3 wt % aluminum oxide with respect to TiO2 improved the efficiency of the dye sensitized solar cell. This amount corresponds to less than a monolayer of aluminum oxide. Thus, the Al ions terminate the TiO2 surface rather than form a distinct aluminum oxide layer. The aluminum ion surface treatment affects the solar cell in different ways: the potential of the conduction band is shifted, the electron lifetime is increased, and the electron transport is slower when aluminum ions are present between interconnected TiO2 particles.
通过将含有少量硝酸铝或氯化铝的二氧化钛悬浮液沉积在导电玻璃基板上，随后进行干燥、压制，最后加热至530摄氏度，制备了用Al³⁺进行表面改性的纳米晶二氧化钛薄膜。相对于二氧化钛，用涂覆有小于0.3 wt%氧化铝的二氧化钛纳米颗粒制备的电极提高了染料敏化太阳能电池的效率。这个量对应于小于单层的氧化铝。因此，铝离子终止了二氧化钛表面，而不是形成一个明显的氧化铝层。铝离子表面处理以不同方式影响太阳能电池：当铝离子存在于相互连接的二氧化钛颗粒之间时，导带电位发生偏移，电子寿命增加，电子传输变慢。
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