Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
The use of colloidal semiconductor nanoparticles (NPs) as sensitizers in solar cells have long been desired owing to their low cost and ease of processing. Colloidal CdSe nanoplatelets (NPLs) are a new class of NPs that have a well-defined thickness of only a few atomic monolayers and lateral dimensions of tens of nanometers. This geometry gives rise to a 2D electronic confinement with a continuous density of states allowing for an inherently high carrier density upon optical excitation and a reduced non-radiative Auger recombination rates. In addition, the high aspect ratio of NPLs leads to a significantly increased intrinsic linear absorption compared to quantum dots or rods making NPLs more efficient light absorbers as compared to their counterparts.
Here, colloidal CdSe nanoplatelets (NPLs) deposited on TiO2 and overcoated by ZnS were explored as light absorbers in semiconductor sensitized solar cells (SSSCs). Significant red-shifts of both absorption and steady-state photoluminescence (PL) along with rapid PL quenching suggest a type-II band alignment at the interface of the CdSe NPL and the ZnS barrier layer grown on the NPLs layer, as confirmed by energy band measurements. The considerable red shift leads to enhanced spectral absorption coverage and the sharp band edge absorption suggests a defect free interface. Cell characterization show an increased open-circuit voltage of 664 mV using a polysulfide electrolyte, which can be attributed to a photo-induced dipole (PID) effect created by the spatial charge separation across the nanoplatelet sensitizers. The observed short-circuit current density of 11.14 mA cm-2 approaches the maximal theoretical current density for this choice of absorber, yielding an internal quantum efficiency (IQE) of close to 100%, a clear signature of excellent charge transport and collection yields. An improved cell design that will offer a controlled orientation of NPLs arrays is expected to realize the full advantage of this material.
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.