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    • 6. 发明授权
    • Femtosecond chirp-free transient absorption method and apparatus
    • 飞秒无啁啾的瞬时吸收方法和装置
    • US06191861B1
    • 2001-02-20
    • US09249726
    • 1999-02-13
    • Duncan W. McBranchVictor I. Klimov
    • Duncan W. McBranchVictor I. Klimov
    • G01N2159
    • G01N21/1717
    • A method and apparatus for femtosecond transient absorption comprising phase-sensitive detection, spectral scanning and simultaneous controlling of a translation stage to obtain TA spectra information having at least a sensitivity two orders of magnitude higher than that for single-shot methods, with direct, simultaneous compensation for chirp as the data is acquired. The present invention includes a amplified delay translation stage which generates a splittable frequency-doubled laser signal at a predetermined frequency f, a controllable means for synchronously modulating one of the laser signals at a repetition rate of f/2, applying the laser signals to a material to be sample, and acquiring data from the excited sample while simultaneously controlling the controllable means for synchronously modulating.
    • 一种用于飞秒瞬态吸收的方法和装置,包括相敏检测,光谱扫描和翻译级的同时控制,以获得具有至少比单次方法高两个数量级的灵敏度的TA光谱信息,其具有直接,同时 获取数据时对啁啾的补偿。 本发明包括放大的延迟转换级,其产生预定频率f的可分开的倍频激光信号,用于以f / 2的重复频率同步调制其中一个激光信号的可控装置,将激光信号施加到 要采样的材料,并且从同时控制用于同步调制的可控装置同时获取激发样品的数据。
    • 7. 发明申请
    • HYBRID PHOTOVOLTAICS BASED ON SEMICONDUCTOR NANOCRYSTALS AND AMORPHOUS SILICON
    • 基于半导体纳米晶体和非晶硅的混合光伏
    • US20100236614A1
    • 2010-09-23
    • US12701396
    • 2010-02-05
    • Victor I. KlimovAlp T. FindikogluBaoquan SunDonald J. WerderMilan Sykora
    • Victor I. KlimovAlp T. FindikogluBaoquan SunDonald J. WerderMilan Sykora
    • H01L31/00H01B1/04
    • H01L31/03529H01L31/03921H01L31/074Y02E10/50
    • Semiconductor nanocrystals (NCs) are promising materials for applications in photovoltaic (PV) structures that could benefit from size-controlled tunability of absorption spectra, the ease of realization of various tandem architectures, and perhaps, increased conversion efficiency in the ultraviolet through carrier multiplication. The first practical step toward utilization of the unique properties of NCs in PV technologies could be through their integration into traditional silicon-based solar cells. Here, we demonstrate an example of such hybrid PV structures that combine colloidal NCs with amorphous silicon. In these structures, NCs and silicon are electronically coupled, and the regime of this coupling can be tuned by altering the alignment of NC states with regard to silicon band edges. For example, using wide-gap CdSe NCs we demonstrate a photoresponse which is exclusively due to the NCs. On the other hand, in devices comprising narrow-gap PbS NCs, both the NCs and silicon contribute to photocurrent, which results in PV response extending from the visible to the near-infrared. This work demonstrates the feasibility of hybrid PV devices that combine advantages of mature silicon fabrication technologies with the unique electronic properties of semiconductor NCs.
    • 半导体纳米晶体(NC)是用于光伏(PV)结构的有希望的材料,可以受益于吸收光谱的尺寸控制可调谐性,各种串联架构的实现的容易性,以及通过载波倍增增加紫外线的转换效率。 使用光伏技术中NC的独特性能的第一个实际步骤可以是通过与传统的硅基太阳能电池的集成。 在这里,我们演示了将胶体NC与非晶硅组合的混合PV结构的一个例子。 在这些结构中,NC和硅是电耦合的,并且可以通过改变关于硅带边缘的NC状态的对准来调节该耦合的状态。 例如,使用宽间隙CdSe NC,我们展示了仅由NCs引起的光响应。 另一方面,在包含窄间隙PbS NC的器件中,NC和硅都有助于光电流,这导致PV响应从可见光延伸到近红外。 这项工作展示了将成熟硅制造技术的优点与半导体NC的独特电​​子性能相结合的混合光伏器件的可行性。