Photocurrent generation in random networks of multiwall-carbon-nanotubes grown by an "all-laser" process

被引：28

作者：

El Khakani, M. A. ^{[1
]}

Le Borgne, V. ^{[1
]}

Aissa, B. ^{[1
]}

Rosei, F. ^{[1
]}

Scilletta, C. ^{[2
]}

Speiser, E. ^{[2
]}

Scarselli, M. ^{[2
]}

Castrucci, P. ^{[2
]}

De Crescenzi, M. ^{[2
]}

机构：

[1] INRS Energie Mat & Telecommun, Inst Natl Rech Sci, Varennes, PQ J3X 1S2, Canada

[2] Univ Roma Tor Vergata, Dept Fis, Unita CNISM, I-00133 Rome, Italy

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 08期

关键词：

carbon nanotubes; laser materials processing; nanofabrication; photoconductivity; photovoltaic effects; Schottky barriers;

D O I：

10.1063/1.3211958

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report photocurrent generation in entangled networks of multiwall-carbon nanotubes (MWCNTs) grown on TiN/Si substrates by an all-laser process. By integrating these MWCNTs into planar devices, we demonstrate that they generate photocurrent over all the visible and near-ultraviolet range, with maximum efficiency around 420 nm. Photocurrent is obtained even at zero applied voltage, pointing to a true photovoltaic (PV) effect. The extracted photocurrent as a function of applied voltage exhibits nonlinear behavior for voltages >= 2 V, suggesting that the devices do not behave as pure photoresistances. Other mechanisms (e.g., Schottky barriers imbalance) are invoked to describe current flow in these PV devices.

引用

页数：3

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