Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Perovskite solar cells (PSCs) have attracted a huge degree of research attention due to reported power conversion efficiencies (PCE) exceeding 20%. The opto-electronic response of PSCs is however, often strongly dependent on their prior electrical and optical conditioning. This results in an observed hysteresis in the characteristic current-voltage scan (J-V) used to measure PCE and slow transient behaviour in steady-state measurements. Understanding the origin and nature of the hysteresis is key to realising stable, high efficiency cells for future commercialisation. In this study we use Transient Photovoltage (TPV) measurements to probe the recombination kinetics of PSCs exhibiting hysteresis during slow time-scale (seconds to 100 s) transient changes in open circuit voltage (VOC). Using these ‘transients of the transient’ (TrOTTr) measurements we show that these slow VOC transients cannot be explained simply by a change in charge carrier lifetime. Furthermore we observe that under certain conditions, PSCs exhibit a negative TPV deflection, providing evidence of a reverse electric field in the active layer. Using a numerical drift diffusion model, we accurately simulate the cell at open circuit with both ionic and electronic charge carriers. We conclude by showing how mobile ions confined to the perovskite layer combined with high rates of surface recombination can induce a reverse field and account for both the slow transient VOC and the negative TPV phenomena.
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.