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Multiple exciton generation in nano-crystals revisited: Consistent calculation of the yield based on pump-probe spectroscopy

机译:纳米晶体中多重激子产生的再研究:基于泵浦探针光谱法一致计算产率

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摘要

Multiple exciton generation (MEG) is a process in which more than one exciton is generated upon the absorption of a high energy photon, typically higher than two times the band gap, in semiconductor nanocrystals. It can be observed experimentally using time resolved spectroscopy such as the transient absorption measurements. Quantification of the MEG yield is usually done by assuming that the bi-exciton signal is twice the signal from a single exciton. Herein we show that this assumption is not always justified and may lead to significant errors in the estimated MEG yields. We develop a methodology to determine proper scaling factors to the signals from the transient absorption experiments. Using the methodology we find modest MEG yields in lead chalcogenide nanocrystals including the nanorods.
机译:多重激子产生(MEG)是一种过程,其中吸收半导体纳米晶体中的高能光子(通常高于带隙的两倍)时会产生一个以上的激子。可以使用时间分辨光谱法(例如瞬态吸收测量)通过实验观察到。 MEG产量的量化通常是通过假设双激子信号是单激子信号的两倍来完成的。本文中,我们证明了这种假设并不总是合理的,并且可能导致估计的MEG产量出现重大错误。我们开发了一种方法来确定适当的比例因子,以适应瞬态吸收实验的信号。使用该方法,我们发现硫族化物铅纳米晶体(包括纳米棒)的MEG产量适中。

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