The CPE is organising a Photon to Electron Symposium on Friday 20 November 2020 focusing on the photon-to-electron applications of organic semiconductors including solar cells, photodetectors and phototransistors.
Session 1: chair – Prof Ji-Seon Kim
2:00-2:10, Welcome & Overview of the photon to electron conversion in organics
2:10-2:30, Prof Martin Heeney, Imperial College London, Acceptor development for OPV blends
2:30-2:50, Prof Koen Vandewal, Hasselt University, Performance Limiting Factors in Organic Solar Cells and Photodetectors
2:50-3:10, Q/A & discussion
3:10-3:30 break
Session 2: chair – Nicola Gasparini
3:30-3:50, Prof Gerwin Gelinck, Holst Centre/Eindhoven University of Technology, Solution Processed Organic Photodetectors for Sensing and Imaging Applications
3:50-4:10, Prof James Durrant, Imperial College London, Charge carrier dynamics in polymeric photocatalysts for solar driven hydrogen generation
4:10-4:30, Q/A & discussion
4:30-4:35 Closing remarks
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Performance limiting factors in organic solar cells and photodetectors
Prof Koen Vandewal, Hasselt University
Abstract
In this talk, I will discuss the fundamental properties of electron-donor-acceptor interfaces for organic optoelectronics and link them to device performance. Focus will be on high and low frequency vibrational modes, as well as absorption and emission tails. Furthermore, a new device resonant optical cavity device architecture will be introduced, resulting in steepened absorption edges, as well as redshifted detection wavelengths in photodetectors and reduced energy losses in photovoltaic devices.
Biography
Prof. Dr. Koen Vandewal obtained his PhD in Physics at Hasselt University in 2009 on the physics of organic photovoltaics. After that, he has been working for two years as a Postdoctoral Fellow at Linkoping University in Sweden and another two years at Stanford University in the US. From 2014 – 2018, he held an endowed professor position at the Technische Universitaet Dresden in Germany. In 2018, he took up a professor position at Hasselt University, where his is leading a research group which aims to solve fundamental questions in the field of organic and molecular electronics with relevance to applications in opto-electronic devices such as organic light-emitting diodes, organic solar cells and sensors.
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Solution processed organic photodetectors for sensing and imaging applications
Prof Gerwin Gelinck, Holst Centre/Eindhoven University of Technology
Abstract
Organic photodetectors (OPDs) are increasingly attractive for light sensing applications as they combine interesting opto-electronic properties and high photogeneration yield with low fabrication costs, light weight and flexibility In this presentation we will give an update on our work on printed organic photodetector technology and its applications in medical and biometric imagers.
Significant progress has been made, with their performance now reaching the point that they are rival their inorganic counterparts in a number of performance criteria including the linear dynamic range, detectivity, and color selectivity.
We will demonstrate semi-transparent optical fingerprint/palmprint scanner of 6x8cm that can measure person’s unique fingerprint ridge patterns and heartbeat at the same time.
We present the first ever prototype of a curved X-ray photodetector on a plastic substrate. The curved detector was integrated into a demonstration system that creates three-dimensional reconstructions of objects. The curved prototype paves the way for smaller optical and 3D imaging X-ray systems with better, more uniform image quality.
Biography
Gerwin Gelinck received his Ph. D. degree in Physical Chemistry from the Technical University in Delft, The Netherlands, in 1998. In that same year Gerwin joined the Philips Research as a Senior Scientist. In 2002 he was co-founder of Polymer Vision, an internal start-up company in the Philips Technology Incubator. From 2002 to 2006 he was Chief Scientist of Polymer Vision. In 2007 Gerwin joined Holst Centre, a collaborative research initiative by imec and TNO, where he managed the research program on organic and oxide transistors and its applications. Since 2019 he is CTO of TNO/Holst Centre. He is also part-time professor in the group of Molecular Materials and Nanosystems (M2N) of the Applied Physics Department at the University of Eindhoven. His research interests include various aspects of the physics, technology and applications of organic and oxide transistors, polymer photodetectors, ferroelectric and piezoelectric polymers and actuators.
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Charge carrier dynamics in polymeric photocatalysts for solar driven hydrogen generation.
Prof James R Durrant
Department of Chemistry, Centre for Processable Electronics, Imperial College London, London W12 0BZ, U.K. and SPECIFIC IKC, College of Engineering, University of Swansea, Swansea, U.K. E-mail: j.durrant@imperial.ac.uk
Abstract
There is increasing interest in the development of artificial photosynthetic systems for solar driven fuel synthesis. Whilst most such systems have employed inorganic light absorbers such as metal oxides, recent studies have demonstrated promising photocatalytic activities for a range of carbon based and polymeric photocatalysts, including carbonitrides, carbon quantum dots and conjugated polymers. In my talk, I will start by briefly discussing the challenge of the solar driven synthesis of sustainable fuels and chemistry, and the potential role of polymeric photocatalysts in such to artificial photosynthetic systems. I will then go on to introduce my own particular research interest, the role of charge carrier dynamics in determining the efficiency of such systems. I will initially address the charge carrier dynamics in carbon nitride photocatalysts, focusing in particular upon the impact of charge trapping and co-catalysts or heterojunctions to aid the spatial separation of charges. I will then go onto conjugated polymers, initially focusing on charge carrier dynamics in single polymer photocatalyst nanoparticles, and the role of residual metal content in influencing photocatalyst performance. Finally I will turn to donor/acceptor bulk heterojunction photocatalysts, addressing the correlation between charge carrier kinetics and photocatalyst performance, and discussing the similarities and differences between the function of such photocatalysts and organic solar cells fabricated from the same donor/acceptor materials.
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Acceptor development for OPV blends
Prof Martin Heeney
Department of Chemistry, Centre for Processable Electronics, Imperial College London, London W12 0BZ, UK. E-mail: m.heeney@imperial.ac.uk
Abstract
Ladder type fused aromatic monomers have been at the forefront of conjugated semiconductor development, finding use as the active component in both transistor and solar applications. Here I discuss our recent efforts to develop flexible synthetic routes to a range of such monomers which allow the ready manipulation of the solubilizing sidechains, as well as the aromatic heterocycle in the fused unit. We show that the nature of the sidechain is important for both donor polymers and non-fullerene acceptors. Changing from commonly used arylalkyl to simple alkyl sidechains is shown to have a positive impact on the performance of materials in single junction solar cells. We also demonstrate that the nature of the fused heterocycle has an important impact on the optoelectronic properties and device properties, highlighting that fused electron rich heterocycles are attractive building blocks for both donor and acceptor materials.
Biography
Martin Heeney is a Professor of Organic Materials Chemistry and Royal Society Wolfson Fellow at Imperial College London. He has extensive expertise in the design and synthesis of conjugated materials and their application. His research interests include the design, synthesis and characterisation of solution processed organic materials for a variety of optoelectronic applications. He has published over 300 research papers (h-index 85), 5 book chapters and 40 patent families comprising over 100 individual patents. He has been named five times by Thomson Reuters as a Highly-Cited researcher in the field of Materials Science, is a recipient of the RSC Corday-Morgan (2013) medal and the RSC Peter Day (2020) award.