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Thick junction broadband organic photodiodes

Ardalan Armin, Mike Hambsch, Il Ku Kim, Paul L Burn, Paul Meredith Orcid Logo, Ebinazar B Namdas

Laser & Photonics Reviews, Volume: 8, Issue: 6, Pages: 924 - 932

Swansea University Author: Paul Meredith Orcid Logo

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DOI (Published version): 10.1002/lpor.201400081

Abstract

Inorganic semiconductor-based broadband photodetectorsare ubiquitous in imaging technologies such as digitalcameras and photometers. Herein a broadband organic photodiode(OPD) that has performance metrics comparable orsuperior to inorganic photodiodes over the same spectral rangeis reported. The pho...

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Published in: Laser & Photonics Reviews
ISSN: 18638880
Published: 2014
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa38600
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Abstract: Inorganic semiconductor-based broadband photodetectorsare ubiquitous in imaging technologies such as digitalcameras and photometers. Herein a broadband organic photodiode(OPD) that has performance metrics comparable orsuperior to inorganic photodiodes over the same spectral rangeis reported. The photodiode with an active layer comprisedof a poly[N-9-heptadecanyl-2,7-carbazole-alt-5,5-(4,7-di-2-thienyl-2,1,3-benzothiadiazole)]:[6,6]-phenyl-C71-butyric acidmethyl ester bulk heterojunction blend had a dark current < 1nA/cm2, specific detectivity of ∼ 1013 Jones, reverse bias −3 dBfrequency response of 100 kHz to 1 MHz, and state-of-the-artLinear Dynamic Range for organic photodiodes of nine ordersof magnitude (180 dB). The key to these performance metricswas the use of a thick junction (700 nm), which flattened thespectral response, reduced the dark current and decreasedperformance variations. The strategy also provides a route tolarge area defect free “monolithic” structures for low noiseintegrated photo-sensing, position determination, or contact,non-focal imaging.
College: College of Science
Issue: 6
Start Page: 924
End Page: 932