Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Perovskite photovoltaics have shown huge potential as a high efficiency, solution processed, thin film photovoltaic technology, with interest soaring over the last few years. There are currently multiple different device architectures with a wide range of photoactive material compositions, interlayers and processing conditions available. We focus our attention on the so called ‘Top Cat’ inverted architecture which is analogous to a conventional organic photovoltaic device, ITO/PEDOT:PSS/Active layer/ PCBM/Ca/Al. Understanding what limits performance, especially at open circuit, is important for further device development.
Optoelectronic techniques such as transient photovoltage (TPV) and transient photocurrent (TPC) have been widely used to study the device performance of a range of thin film photovoltaic technologies, including DSSC and OPV. Differential charging is used to access the energetic position of the electron hole density of states, due to quasi-Fermi levels splitting as a result of charge accumulation. From TPV, the average charge carrier lifetime is seen to show a strong dependence on carrier density. From measurements of the ideality factor, we conclude surface recombination to be a key recombination pathway for this device architecture. The Br content of a CH3NH3Pb(I1-xBrx)3) perovskite active layer is studied as an example of how knowledge of both energetic and kinetic changes, not just the bandgap, are required to understand the final device VOC. Increasing the Br content to 20% increased the VOC by up to 170 mV. This increase in VOC was found to be primarily from an energetic increase in bandgap; however, this was somewhat limited by a competing increase in recombination rate; the device voltage was successfully reconstructed for a wide range of light intensities. Finally, we make comparisons with high performing organic materials for OPV applications, and find remarkable similarities in how recombination limits device performance.
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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.
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.