Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Efficient solid state dye-sensitized solar cells (sDSCs) were obtained using a small hole transport material with inexpensive synthetic scheme, high solubility and hole mobility, MeO-TPD,1 (N,N,N',N'-tetrakis(4-methoxyphenyl)benzidine) after an initial light soaking treatment. It was discovered that the light soaking treatment for the MeO-TPD based solar cells is essential in order to achieve the high efficiency (4.9%), which outperforms spiro-OMeTAD based sDSCs using the same dye and device preparation parameters. A mechanism based on Li+ ion migration is suggested to explain the light soaking effect. It was observed that the electron lifetime for the MeO-TPD based sDSC strongly increases after the light soaking treatment, which explains the higher efficiency. After the initial light soaking treatment the device efficiency remains considerably stable with only 0.2 % decrease after around one month. We also describe how a light soaking treatment is essential for devices based on MeO-TPD to obtain high efficiency. By treating the devices under simulated illumination (AM 1.5G) at open-circuit condition for 30 minutes, the efficiency is increased more than 4 times. After light soaking treatment sDSCs based on MeO-TPD outperform spiro-OMeTAD based devices in spite of the poor initial device performance. We have obtained a record power conversion efficiency (η) of 4.9% in a 2.2 μm thick film of mesoporous TiO2 device by utilizing an organic dye coded LEG4 together with MeO-TPD. Thus MeO-TPD is one of the best organic small-molecule HTMs in sDSCs ever reported.After the light soaking treatment maximal efficiency retains at a nearly similar level for at least one month, which shows that the process occurring during the light-soaking treatment improved the device performance to a stable level. The specific nature of the HTM is essential, which requires in-depth characterizations and analysis to be fundamentally understood. The discovery is very important for future development of sDSC with different HTMs. Therefore we further discuss this phenomenon in terms of Li+ migration towards the TiO2 surface in presence of the different HTMs. It might be the case that many of the inapplicable HTMs previously tested in sDSC could probably exhibit better performance if treated by light soaking in combination with Li+ salts. According to these results a mechanism of device performance evolution depending on Li+ ion migration towards the surface of TiO2 nanoparticles under light soaking was suggested.2 These results provide a promising pathway for developing new small-molecule HTMs alternative to spiro-OMeTAD in sDSCs.
Walzer K.; Maennig B.; Pfeiffer M.; Leo K. Chem. Rev., 2007, 107, 1233−1271. Yang L.; Xu B.; Bi D.; Tian H.; Boschloo G.; Sun L.; Hagfeldt A.; Johansson E. M. J. J. Am. Chem. Soc., 2013, 135, 7378−7385.
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.