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Applied Physics Letters / Volume 95 / Issue 26 / ORGANIC ELECTRONICS AND PHOTONICS
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Appl. Phys. Lett. 95, 263302 (2009); http://dx.doi.org/10.1063/1.3279133 (3 pages)

A near infrared organic photodiode with gain at low bias voltage

I. H. Campbell and B. K. Crone

Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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(Received 9 October 2009; accepted 5 December 2009; published online 28 December 2009)

We demonstrate an organic photodiode with near infrared optical response out to about 1100 nm with a gain of ∼ 10 at 1000 nm under 5 V reverse bias. The diodes employ a soluble naphthalocyanine with a peak absorption coefficient of ∼ 105 cm−1 at 1000 nm. In contrast to most organic photodiodes, no exciton dissociating material is used. At zero bias, the diodes are inefficient with an external quantum efficiency of ∼ 10−2. In reverse bias, large gain occurs and is linear with bias voltage above 4 V. The observed gain is consistent with a photoconductive gain mechanism.

© 2009 American Institute of Physics

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KEYWORDS and PACS

Keywords

absorption coefficients, organic semiconductors, photoconductivity, photodiodes

PACS

  • 85.60.Dw

    Photodiodes; phototransistors; photoresistors

  • 81.05.Fb

    Organic semiconductors

  • 72.40.+w

    Photoconduction and photovoltaic effects

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3279133

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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Figures (click on thumbnails to view enlargements)

FIG.1
Diode current density-voltage characteristic on a linear scale and log scale (inset).

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
Photocurrent gain as a function of wavelength at the reverse bias voltages indicated.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
Optical absorbance of OSnNcCl2 (inset) as a thin film (50 nm, solid line, left vertical axis) and in a dilute chlorobenzene solution (dashed line, right vertical axis).

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.4
Gain at 1000 nm as a function of reverse bias.

FIG.4 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.5
Normalized gain at 2 V (open circles) and 8 V (crosses) reverse bias as a function of frequency.

FIG.5 Download High Resolution Image (.zip file) | Export Figure to PowerPoint



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