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5 October 2015 Quantifying energy transfer in semiconductor nanocrystals using coherent phonon manipulation and ultrafast spectroscopy (Presentation Recording)
Bryan T. Spann, Xianfan Xu
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Proceedings Volume 9562, Next Generation Technologies for Solar Energy Conversion VI; 956206 (2015) https://doi.org/10.1117/12.2186831
Event: SPIE Optics + Photonics for Sustainable Energy, 2015, San Diego, California, United States
Abstract
One potential way to increase photovoltaic efficiency is to take advantage of hot-carriers. Nanocrystal based solar cells aim to take advantage of hot-carrier capture to boost device performance. The crucial parameter for gauging a given nanocrystal material for this application is the electron-phonon coupling. The electron-phonon coupling will dictate the thermalization time of hot-carriers. In this study we demonstrate a method of quantifying the electron-phonon coupling in semiconductor nanocrystals. By employing ultrafast transient absorption spectroscopy with temporal pulse shaping, we manipulate coherent phonons in CdTe_{1-x}Se_{x} nanocrystals to quantify the efficiency of the electron-phonon coupling. The Raman active longitudinal optical phonon (LO) modes were excited and probed as a function of time. Using a temporal pulse shaper, we were able to control pump pulse pairs to coherently excite and cancel coherent phonons in the CdTe_{1-x}Se_{x} nanocrystals, and estimate the relative amount of optical energy that is coupled to the coherent CdSe LO mode which is the dominant thermalization pathway for the hot-electrons in this system.
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Bryan T. Spann and Xianfan Xu "Quantifying energy transfer in semiconductor nanocrystals using coherent phonon manipulation and ultrafast spectroscopy (Presentation Recording)", Proc. SPIE 9562, Next Generation Technologies for Solar Energy Conversion VI, 956206 (5 October 2015); https://doi.org/10.1117/12.2186831
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KEYWORDS
Nanocrystals
Phonons
Semiconductors
Ultrafast laser spectroscopy
Energy transfer
Solar energy
Absorption spectroscopy
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