Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Current-voltage measurement and impedance spectroscopy (IS) are two closely related techniques. In this talk, we first show how different external contacts in Perovskite solar cells (PSCs) change the extracted-current transport resistance and the corresponding effects in the IS and the jV curve.[1] Hysteresis is the difference between the jV scan measured form short circuit to open circuit conditions (forward scan) and the opposite direction scan (reverse scan). Normal hysteresis, improved FF and Voc in the reverse scan compared to the forward scan, is commonly observed in PSCs. This hysteresis has been related to the low-frequency capacitance in the IS response.[2, 3] Inverted hysteresis, which improves FF and Voc in the forward scan, as well as negative capacitance at the IS low-frequency domain, are also familiar features in PSC, but their origin is still under discussion. In this talk, we show the emergence of these responses in two separate experiments employing different PSCs formulations. By mean of the Surface Polarization Model[4, 5] we expose that these features have a time constant associated with ions/vacancies kinetics interaction with the surface. These interactions increase the interfacial recombination, reducing the recombination resistance obtained by the IS measurements and provoking a flattening of the j-V curve.[6]
The authors acknowledge funding from the European Union’s Horizon 2020 MSCA Innovative Training Network under grant agreement No 764787. Authors want to acknowledge Ministerio de Economía y Competitividad (MINECO) from Spain under project, ENE2017-85087-C3-1-R.
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.