Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Over the last decade, the power conversion efficiencies of bulk heterojunction (BHJ) organic solar cells (OSCs) have steadily increased, demonstrating their high potential for photovoltaic applications. Yet, further improvement will depend crucially on the understanding of detrimental charge recombination mechanisms occurring in the active layer of such devices. Continuous-wave photo-induced absorption (CW-PIA) is particularly well-suited to study light-induced charge carriers in BHJ blends and devices as it requires only moderate light intensities, comparable to standard solar cell operation conditions. The technique has been mainly applied to gain spectral information on molecular photo-excitations, but also dynamical information could be gained from the dependence on modulation frequency [1].
In an alternative approach we focus here on the time dependence of the PIA-response under modulation with sharp on/off switching, as previously demonstrated by Hagfeldt and Boschloo [2]. As such, time-domain CW-PIA offers unique insights into the charge generation and recombination kinetics both in thin films of BHJ blends and in OSC devices. By modeling of the functional behavior of time-domain PIA data, it is possible to distinguish between underlying recombination mechanisms and to extract relevant rate parameters. In this context, we identify two major types of recombination mechanisms depending on whether the involved electron and hole originate from the same photon-event – so called ‘geminate recombination’ – or not. We performed a detailed analysis of time-domain CW-PIA data taken under varying conditions of excitation intensity and modulation frequency on spin-coated films of BHJ blends. Parallel kinetic modeling of these sets of data provides qualitative and quantitative information of importance for the understanding of recombination processes in these systems.
[1] T. Kobayashi, Y. Terada, T. Nagase, and H. Naito: Appl. Phys. Express 4 (2011) 126602.
[2] G. Boschloo and A. Hagfeldt: Inorg. Chim. Acta 361 (2008) 729.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.