Temperature-Dependent Detectivity of Near-Infrared Organic Bulk Heterojunction Photodiodes
- 3 January 2017
- journal article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 9 (2), 1654-1660
- https://doi.org/10.1021/acsami.6b12162
Abstract
Bulk heterojunction photodiodes are fabricated using a new donor-acceptor polymer with a near-infrared absorption edge at 1.2 μm, achieving a detectivity up to 10 Jones at a wavelength of 1 μm and an excellent linear dynamic range of 86 dB. The photodiode detectivity is maximized by operating at zero bias to suppress dark current, while a thin 175 nm active layer is used to facilitate charge collection without reverse bias. Analysis of the temperature dependence of the dark current and spectral response demonstrates a 2.8-fold increase in detectivity as the temperature was lowered from 44 to -12 °C, a relatively small change when compared to that of inorganic-based devices. The near-infrared photodiode shows a switching speed reaching up to 120 μs without an external bias. An application using our NIR photodiode to detect arterial pulses of a fingertip is demonstrated.Keywords
Funding Information
- Division of Graduate Education (DGE-1449999)
- Electrical and Computer Engineering Department, University of California, San Diego
This publication has 36 references indexed in Scilit:
- Narrowband light detection via internal quantum efficiency manipulation of organic photodiodesNature Communications, 2015
- Solution‐Processable Donor–Acceptor Polymers with Modular Electronic Properties and Very Narrow BandgapsMacromolecular Rapid Communications, 2014
- 25th Anniversary Article: A Decade of Organic/Polymeric Photovoltaic ResearchAdvanced Materials, 2013
- Efficiency of bulk-heterojunction organic solar cellsProgress in Polymer Science, 2013
- Bridgehead Imine Substituted Cyclopentadithiophene Derivatives: An Effective Strategy for Band Gap Control in Donor–Acceptor PolymersMacromolecules, 2013
- Recent advances in solution-processed interfacial materials for efficient and stable polymer solar cellsEnergy & Environmental Science, 2012
- Recent progress in infrared detector technologiesInfrared Physics & Technology, 2010
- Nanostructured materials for photon detectionNature Nanotechnology, 2010
- Near-infrared imaging with quantum-dot-sensitized organic photodiodesNature Photonics, 2009
- Polymer‐Fullerene Bulk‐Heterojunction Solar CellsAdvanced Materials, 2009