Photovoltaic Applications of Silicon Nanocrystal Based Nanostructures Induced by Nanosecond Laser Fragmentation in Liquid Media
Photovoltaic Applications of Silicon Nanocrystal Based Nanostructures Induced by Nanosecond Laser Fragmentation in Liquid Media
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DOI：
10.1021/jp109301d
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发表时间：
2011-03-31
影响因子：
3.7
通讯作者：
Kondo, M.
中科院分区：
文献类型：
--
作者：
Svrcek, V.;Mariotti, D.;Kondo, M.
具有量子限制特性的硅纳米晶是一种极具吸引力的光伏材料。通过有效的电子输运和激子解离收集光生电流的能力是部署基于Si-nc的太阳能电池的当前挑战。我们在这里报告的前瞻性和成本效益的方法，工程师的表面电化学蚀刻硅纳米粒子在乙醇和水的激光碎片。通过光致发光和吸收测量以及傅里叶变换红外光谱，详细分析了工程化的硅纳米材料的性质。为了证明在液体介质中的Si-nc表面工程的有利属性，已经制造了几个基于不同架构的光伏器件。首先，TiO 2纳米管已被用作主机模板激光破碎的硅纳米形成无机敏化太阳能电池架构。第二，我们已经生产出具有Si-NC/富勒烯光活性界面的体异质结太阳能电池。通过用水溶性聚（3，4-亚乙基二氧噻吩）官能化Si-nc表面，即，PEDOT。这里生产的所有器件的特征在于外部量子效率测量，在某些情况下，电流电压特性也进行了测量。
Silicon nanocrystals (Si-ncs) with quantum confinement properties represent an attractive photovoltaic material. The ability to collect the photogenerated current through efficient electronic transport and exciton dissociation is a current challenge for the deployment of Si-nc based solar cells. We report here on prospective and cost-effective approaches to engineer the surface of electrochemically etched Si-ncs by laser fragmentation in ethanol and water. The properties of the engineered Si-ncs have been analyzed in detail by photoluminescence and absorption measurements together with Fourier transform infrared spectroscopy. To demonstrate the advantageous attributes of Si-nc surface engineering in liquid media, a few photovoltaic devices based on different architectures have been fabricated. First, anatase TiO2 nanotubes have been used as a host template for laser-fragmented Si-ncs to form inorganic-sensitized solar cell architectures. Second, we have produced bulk-heterojunction solar cells with a Si-nc/fullerene photoactive interface. This design has been further improved by functionalizing the Si-nc surface with water-soluble poly(3,4-ethylenedioxythiophene), i.e., PEDOT. All the devices produced here have been characterized with external quantum efficiency measurements, and in some cases the current voltage characteristic has been also measured.