Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Publication date: 25th November 2019
Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is one of the most common conducting polymers in hybrid and organic electronics. Its ease of processing and low toxicity is accompanied by the high conductivity, high optical transparency, mechanical flexibility but most importantly, it enables low temperature electronic device fabrication, hence the use of flexible plastic substrates [1]. However, despite all these benefits, its acidic nature is highly detrimental to any other adjacent materials within photovoltaic devices, especially the organic photoactive materials for solar cells or even the indium tin oxide (ITO) electrode [2,3]. Additionally, there is an energetic mismatch between the energy levels of PEDOT:PSS and mixed-halide perovskite, limiting efficient charge extraction at this interface resulting low open circuit voltage (Voc) and short circuit current (Jsc) in solar cells. One approach to improve the charge dynamics at this interface is to use a buffer layer that can lower the hole injection barrier and prevent the non-radiative exciton quenching. For this purpose we chose two polymers: poly(N-vinylcarbazole) (PVK) and poly2,7-9,9-di-n-octylfluorene-alt-1,4-phenylene-4-sec-butylphenylimino-1,4-phenylene (TFB).
The effect of intermediary thin p-type polymer layers placed between the hole-transporting layer PEDOT:PSS and the active layer within mixed-halide perovskite solar cells (HPSCs) is studied herein. Our work was focused on studying the quality of the perovskite layer on top of these layers by field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), XRD as well as on the charge dynamics at the holes-transporting interface by photoluminescence spectroscopy (PL) and X-ray photoelectron spectroscopy (XPS). We find that the perovskite settles well, compactly and without pinholes on all polymers. The photoluminescence spectra indicate the excitonic quenching for all polymers, including for the perovskite deposited only on PEDOT:PSS. However, there are slight differences where the effect is more pronounced for samples with PVK interlayer. These results are in good agreement with the photovoltaic parameters measured for the corresponding HPSCs.
The authors acknowledge funding through projects PN-III-P1-1.1-PD-2016-0703, PN 177/2017 and the Core Program PN19-03 from the Romanian Ministry of Research and Innovation.
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.