Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
The recent significant increase in power conversion efficiency (PCE) of polymer-fullerene solar cells largely originates from the successful development of new electron donor polymers. The donor-acceptor (D-A) or push-pull design, where electron rich and electron deficient units alternate along the copolymer chain is commonly used to tune the HOMO and LUMO energy levels and the optical band gap of these polymers. While structure-property relations for energy levels are well established, these are less clear for the actual photovoltaic performance. Creating morphologies in which nanometer-sized, interconnected, semi-crystalline domains of both polymer and fullerene exist is crucial for high photovoltaic performance. These semi-crystalline domains optimize the conjugation along the polymer backbone and allow delocalizing the carrier wave functions to assist efficient charge separation. High molecular weight and a tendency to crystallize are important in achieving such morphologies. For a series of conjugated polymers a direct correlation between their external quantum efficiencies in organic solar cells and the fibrillar microstructure in the blend will be demonstrated. The highest quantum and power conversion efficiencies are obtained for polymers with fibril widths less than 12 nm. For blends with fibrils wider than 12 nm, the quantum efficiency is low reduced because exciton diffusion becomes limiting for charge generation.
Tandem and triple junction solar cells form a promising strategy to further increase the power conversion efficiency of organic photovoltaics beyond the limits of single junctions. By combining the characteristics of representative single junction cells the optimal device layout can be accurately designed. When the new semiconductor materials are combined with a wide band gap material it is possible to make create efficient multi-junction devices in tandem or triple layer configurations. The favorable efficiency of these multi-junction cells is achieved by almost perfect complementarity of the absorption spectra of the different absorber layers that reduce thermalization and transmission losses. Because of their high voltages, triple junction solar cells can be used for photo-electrochemical water splitting.
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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.
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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.
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