Phonons Do Not Assist Carrier Multiplication in PbSe Quantum Dot Solids

被引：13
|
作者：
ten Cate, Sybren [1 ]
Liu, Yao [2 ]
Schins, Juleon M. [1 ]
Law, Matt [2 ]
Siebbeles, Laurens D. A. [1 ]
机构：
[1] Delft Univ Technol, Dept Chem Engn, Optoelect Mat Sect, NL-2628 BL Delft, Netherlands
[2] Univ Calif Irvine, Dept Chem, Irvine, CA 92697 USA
来源：
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2013年 / 4卷 / 19期
关键词：
MULTIPLE EXCITON GENERATION; EFFICIENCY; NANOCRYSTALS; DYNAMICS; SIZE; DIFFUSION; YIELD;
D O I：
10.1021/jz401780w
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Carrier multiplication (CM)-the Coulomb scattering whereby a sufficiently energetic charge excites a,valence electron-is of interest for highly efficient quantum dot (QD) photovoltaics. Using time resolved microwave conductivity experiments on 1,2-ethanedithiol-linked PbSe QD solids infilled with Al2O3 or Al2O3/ZnO by atomic layer deposition, we find that CM and hot carrier cooling are temperature independent from 90-295 K and that spontaneous phonon emission limits the yield of charges resulting from the CM-cooling competition.
引用
收藏
页码：3257 / 3262
页数：6
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