Persistent photocurrents in CVD diamond

被引：48

作者：

Nebel, CE

Waltenspiel, A

Stutzmann, M

Paul, M

Schäfer, L

机构：

[1] Tech Univ Munich, Walter Schottky Inst, D-85748 Garching, Germany

[2] Fraunhofer Inst Schicht & Ionentech, D-38108 Braunschweig, Germany

来源：

关键词：

CVD diamond; density-of-state model; persistent photocurrents; thermally stimulated current;

D O I：

10.1016/S0925-9635(99)00204-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Persistent photocurrents (PPCs) in undoped polycrystalline CVD diamond are generated by UV illumination with 5.5 eV photons. PPCs are several orders of magnitude larger than dark currents and can be annealed at T > 550 K. The PPC annealing dynamic is stretched exponentially with an activation energy of 1.4 eV. Thermally stimulated currents (TSCs) are dominated by maxima around 550 K which are related to a trap level 1.4 eV deep in the energy gap of CVD diamond. UV illumination generates a photocurrent response with an onset at hv greater than or equal to 0.6 eV measured by spectrally resolved photocurrents. A modal is discussed which accounts for the detected phenomena where electrons are captured in grain boundaries and holes in defects in the grains of CVD diamond. (C) 2000 Elsevier Science S.A. All rights reserved.

引用

页码：404 / 407

页数：4