铁电绝缘体中非热平衡光生载流子的介观自由程

Mesoscopic Free Path of Nonthermalized Photogenerated Carriers in a Ferroelectric Insulator.

作者信息

Gu Zongquan, Imbrenda Dominic, Bennett-Jackson Andrew L, Falmbigl Matthias, Podpirka Adrian, Parker Thomas C, Shreiber Daniel, Ivill Mathew P, Fridkin Vladimir M, Spanier Jonathan E

机构信息

Department of Electrical and Computer Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA.

Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA.

出版信息

Phys Rev Lett. 2017 Mar 3;118(9):096601. doi: 10.1103/PhysRevLett.118.096601. Epub 2017 Mar 1.

DOI:10.1103/PhysRevLett.118.096601

PMID:28306282

Abstract

We show how finite-size scaling of a bulk photovoltaic effect-generated electric field in epitaxial ferroelectric insulating BaTiO_{3}(001) films and a photo-Hall response involving the bulk photovoltaic current reveal a large room-temperature mean free path of photogenerated nonthermalized electrons. Experimental determination of mesoscopic ballistic optically generated carrier transport opens a new paradigm for hot electron-based solar energy conversion, and for facile control of ballistic transport distinct from existing low-dimensional semiconductor interfaces, surfaces, layers, or other structures.

摘要

我们展示了外延铁电绝缘BaTiO₃(001)薄膜中体光伏效应产生的电场的有限尺寸标度，以及涉及体光伏电流的光霍尔响应，揭示了光生非热电子在室温下的大平均自由程。介观弹道光学产生的载流子输运的实验测定为基于热电子的太阳能转换以及与现有低维半导体界面、表面、层或其他结构不同的弹道输运的简便控制开辟了新的范例。