Publication date: 14th September 2021
Quasi-two dimensional (2D) layered perovskites ((A’)2(ABX3)n-1BX4) widely used in halide perovskite solar cell (PSC) to increase the moisture stability due to hydrophobic long chain organic cation.[i] Along with higher moisture stability quasi-2D perovskites have relatively more exotic optical properties than their 3D ABX3 halide perovskites congener, like prominent excitonic feature, higher PL yield, and composition induced energy transfer among different phases. However, there are known challenges in quasi-2D perovskite where by default one gets a mixture of various phases of 2D perovskites and 3D perovskite (n=1, 2, 3….3D).[ii] Energy transfer processes occur among various phases, and optimization is needed to ensure one can get the best optical properties by targeting optimal phase purity. We have done a detailed analysis of structural and optical properties of different perovskites (2D perovskite, quasi-2D perovskite & 3D perovskite) of ((PEA)2(FAPbBr3)n-1PbBr4) series. We prepared n=3 composition with the least phase impurity, which provided a higher photoluminescence emission intensity than other layered perovskites of this series. Hence, n=3 composition has been used as an emissive layer for perovskite light-emitting diode (PeLED) fabrication. Poly(9-vinyl carbazole) (PVK) used as an additional hole-injection layer along with PEDOT: PSS (i) to suppress the leakage current (for effective blocking of electrons) and (ii) suppress the non-radiative channels at the interface. We have also varied the thickness of the emissive layer from 60 nm to 325 nm, achieved maximum efficiency for 100 nm thick perovskite film with luminance efficiency of 15.4 cd/A and EQE 4.32%.[iii]
We acknowledge UKRI-SUNRISE,
NCPRE and IRCC -IIT Bombay for funding,
fabrication and characterization facilities
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.