Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
One of the main issues in organic cells has been the slow feedback loop on the stability of the materials and cells. This has led to large amounts of work on the optimization and theoretical understanding of materials that are eventually abandoned for lack of stability. We are attempting to close this loop with "hyper accelerated" aging experiments using "cool white" 50 sun LED light sources. The sources allow us to apply, in one weekend, a number of photons equivalent to outdoor exposure for one year at a sunny location, while keeping the temperature below 60 oC. Last year we presented stable performance of DSSCs and polymer cells up to 2 hours at 12 and 50 suns respectively. We will now show DSSCs and polymer cells which are reasonably stable for >20 hours at 50 suns. In addition we have optimized a sealing procedure that gives reasonably stable methyl ammonium lead halide perovskite (MAPH) cells for >60 hours at 40 suns. We have begun a series of 40 day 50 sun experiments, equivalent to 20 years outdoors, on MAPH cells. The benefit of these experiments is that they test only the photostability of the materials. Thermal diffusion through the seals will not be accelerated to the same degree at photon input. Prior methods usually left open the question of whether the materials or the seals (or both) were to blame for instability.
Our work on the dye/electrolyte interface will be summarized. We have solidified the story of competitive Guanidinium and iodine binding presented at pervious HOPVs. The work has led us to believe that species binding at the dye/electrolyte interface is more important than that at the TiO2/electrolyte boundary. The lack of previous study on this interface has probably contributed to the slow increase in efficiency. The implications for future work will be mentioned.
We have also developed an "inexpensive" LED laser based transient photovoltage and photocurrent system for measurement of very fast electrical transients ( ≥~20 ns) in MAPH cells, and polymer/PCBM cells at >10 suns. Correlated transient absorption and photocurrent measurements, applied to the direct determination of collection efficiency in any solar cell, will also be discussed; specifically with regard to collection efficiency in cobalt electrolyte DSSCs.
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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.