Publication date: 14th December 2015
Ultrafast optical probing of electric field by means of electro-absorption (time-resolved Stark effect) was employed to investigate the separation distance between photo-generated charge carriers of opposite sign upon drifting in illuminated methylammonium lead triiodide perovskite (CH3NH3PbI3) insulated thin films.
In ultrafast electro-modulated differential absorption (EDA) spectroscopy, we investigate the picosecond screening of the electric field induced (Stark) shift of a materials absorption spectrum by photo-generated carriers. A femtosecond monochromatic pump pulse creates the photo-generated charge carriers, while a broadband probe pulse monitors the evolution of the Stark shift due to carrier drift and screening of the externally applied applied field.
We present the results for insulated CH3NH3PbI3 layers and estimate a mobility value of µ ≃ 6 cm2 /(V·s) from the observed field decay due to carrier screening. In addition, due to the insulating layers that prevent carrier extraction at the electrodes there is a growing accumulation of carriers at the interface. This manifests as a growing bleach signal that can be related to depopulation of trap states and carrier transport across the film.
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.
Conferencia Internacional sobre Fotovoltaica Híbrida y Orgánica
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.