Fritz Haber Center for Molecular Dynamics, the Chaim Weizmann Institute of Chemistry, the Hebrew University of Jerusalem, Jerusalem 91904, Israel.
Nano Lett. 2010 Sep 8;10(9):3277-82. doi: 10.1021/nl100639h.
We address recent experiments (Science 2009, 325, 1367) reporting on highly efficient multiplication of electron-hole pairs in carbon nanotube photodiodes at photon energies near the carrier multiplication threshold (twice the quasi-particle band gap). This result is surprising in light of recent experimental and theoretical work on multiexciton generation in other confined materials, such as semiconducting nanocrystals. We propose a detailed mechanism based on carrier dynamics and impact excitation resulting in highly efficient multiplication of electron-hole pairs. We discuss the important time and energy scales of the problem and provide analysis of the role of temperature and the length of the diode.
我们讨论了最近的实验（《科学》2009 年，325 卷，1367 页），这些实验报告了在接近载流子倍增阈值（准粒子能带隙的两倍）的光子能量下，碳纳米管光电二极管中电子-空穴对的高效倍增。鉴于最近在其他受限材料（如半导体纳米晶体）中多激子产生的实验和理论工作，这一结果令人惊讶。我们提出了一个基于载流子动力学和碰撞激发的详细机制，该机制导致电子-空穴对的高效倍增。我们讨论了该问题的重要时间和能量尺度，并提供了对温度和二极管长度的作用的分析。
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