Theoretical simulations of optical confinement in dye-sensitized nanocrystalline solar cells
Theoretical simulations of optical confinement in dye-sensitized nanocrystalline solar cells
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DOI：
10.1016/s0927-0248(00)00049-0
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发表时间：
2000-09-01
影响因子：
6.9
通讯作者：
Usami, A
中科院分区：
文献类型：
--
作者：
Usami, A
从理论上研究了亚微米二氧化钛光散射在染料敏化纳米晶光电化学电池中的应用。Monte Carlo模拟结果表明，纳米晶薄膜中光子吸收路径的增加和太阳能电池表面全反射引起的光限制显著提高了敏化薄膜的光吸收。光限域效应的贡献远大于吸收路径长度的增加。量子效率的计算，考虑在纳米晶薄膜中的电子的复合。光散射的应用显著提高了量子效率，特别是在长波长光下。光学限制允许利用较薄的敏化膜。讨论了散射膜中光吸收的分布。由于透明导电氧化物（TCO）电极附近的光反射，该分布未被表示为指数表达式。光学限制减少了光反射，并提高了TCO电极附近的光吸收，在TCO电极处，所产生的电子可以扩散而不会复合。(C)2000 Elsevier Science B.V.保留所有权利。
The application of light scattering of submicron TiO2 particles to dye-sensitized nanocrystalline photoelectrochemical cells is examined theoretically. Monte Carlo simulations reveal that the increase of absorption path length of photons in nanocrystalline films and optical confinement due to total reflections at solar cell surfaces improve light absorption in the sensitized films remarkably. Contribution of optical confinement to the improvement is much greater than that of the increase of absorption path length. Quantum efficiencies are calculated, considering the recombination of electrons in the nanocrystalline films. The application of light scattering improves the quantum efficiencies remarkably, especially in long wavelength lights. Optical confinement permits utilization of thinner sensitized films. Distributions of light absorption in the scattering films are also discussed. The distributions are not represented as exponential expressions due to light reflections in the vicinities of transparent conductive oxide (TCO) electrodes. Optical confinement decreases the light reflections and improves light absorption next to the TCO electrodes where generated electrons can diffuse without recombinations. (C) 2000 Elsevier Science B.V. All rights reserved.