A polymer/fullerene based photodetector with extremely low dark current for x-ray medical imaging applications

被引：114

作者：

Agostinelli, T. ^{[1
]}

Campoy-Quiles, M. ^{[2
]}

Blakesley, J. C. ^{[3
]}

Speller, R. ^{[3
]}

Bradley, D. D. C. ^{[2
]}

Nelson, J. ^{[2
]}

机构：

[1] Politecn Milan, Dipartimento Elettron & Informaz, I-20133 Milan, Italy

[2] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2BW, England

[3] UCL, London WC1E 6BT, England

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 20期

基金：

英国工程与自然科学研究理事会;

关键词：

diagnostic radiography; fullerenes; organic semiconductors; phosphors; photodetectors; polymers;

D O I：

10.1063/1.3028640

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Organic photodetectors for use in medical x-ray digital imaging applications are fabricated from poly(3-hexylthiophene) and [6,6]-phenyl C-61-butyric acid methyl ester using a solution-based, temperature assisted deposition protocol. In comparison to bulk heterojunction structures, the proposed protocol leads to much lower dark currents while still offering useful external quantum efficiency values. Devices made by this protocol lead to dark currents of around 50 pA/cm(2) at -0.8 V, well within the requirements for x-ray digital imaging. When coupled to a scintillating phosphor screen the device yields a linear response of photocurrent to x-ray exposure (from 0 to 7mGy/s) for a range of operating biases.

引用

页数：3

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