Ultrafast Exciton Formation at the ZnO(10(1)over-bar0) Surface

被引：52

作者：

Deinert, J. -C. ^{[1
]}

Wegkamp, D. ^{[1
]}

Meyer, M. ^{[1
]}

Richter, C. ^{[1
]}

Wolf, M. ^{[1
]}

Staehler, J. ^{[1
]}

机构：

[1] Max Planck Gesell, Fritz Haber Inst, Phys Chem Abt, D-14195 Berlin, Germany

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 05期

关键词：

ZNO QUANTUM DOTS; ULTRAVIOLET PHOTOLUMINESCENCE; ELECTRON; DYNAMICS; PLASMA;

D O I：

10.1103/PhysRevLett.113.057602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the ultrafast quasiparticle dynamics in and below the ZnO conduction band using femtosecond time-resolved two-photon photoelectron spectroscopy. Above band gap excitation causes hot electron relaxation by electron-phonon scattering down to the Fermi level E-F followed by ultrafast (200 fs) formation of a surface exciton (SX). Transient screening of the Coulomb interaction reduces the SX formation probability at high excitation densities near the Mott limit. Located just below the surface, the SX are stable with regard to hydrogen-induced work function modifications and thus the ideal prerequisite for resonant energy transfer applications.

引用

页数：5

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