Probing local photophysical properties in perovskite based light-emitting devices

Miguel Anaya^a, Kyle Frohna^a, Linsong Cui^a, Javad Shamsi^a, Sam Stranks^a

^aOptoelectronics Group, Cavendish Laboratory, University of Cambridge, UK., J.J. Thomson Avenue, Cambridge, United Kingdom

NIPHO
Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)

Sevilla, Spain, 2020 February 23rd - 25th

Organizer: Hernán Míguez

Oral, Miguel Anaya, presentation 048
DOI: https://doi.org/10.29363/nanoge.nipho.2020.048
Publication date: 25th November 2019

Metal-halide perovskites have emerged over the past years as a versatile class of semiconductors for high-performance optoelectronic devices.[1] Despite their unique properties, this family of perovskites has however been observed to display strong instability, especially when electrostimulated, limiting their definitive integration in real-world light-emitting devices.[2,3]

In this talk, we will present a detailed photophysical characterisation of blue-, green- and red-emitting metal halide perovskite films in which different passivation strategies are employed to improve both their optical and electrical properties. We will introduce a new powerful technique with which we can extract the absorptance and photoluminescence quantum efficiency (PLQE) values in the materials at the nanoscale by hyperspectral wide-field imaging. We will then show how our methodology can be extended to characterise operando LEDs and obtain maps at the diffraction limit scale for their External Quantum Efficiency, luminance and luminous efficacy. Our observations allow us to identify the degradation paths of these emerging class of LEDs, revealing microscale heterogeneities that are remarkably suppressed in the passivated samples. Our results open avenues to diagnose the optoelectronic quality of novel semiconductors at the microscale and identify strategies to integrate them in LEDs with spatially maximised performance.

References:

[1] Stranks, S. D. and Snaith, H. J. Metal-halide perovskites for photovoltaic and light-emitting devices. Nat. Nanotechnol. 2015, 10, 391.

[2] Anaya, M.; Rand, B. P.; Holmes, R. J.; Credgington, D.; Bolink, H. J.; Friend, R. H.; Wang, J.; Greenham, N. C.; Stranks, S. D. Best practices for measuring emerging light-emitting diode technologies. Nature Photonics, in press.

[3] Hoye, R. L. Z.; Lai, M.-L.; Anaya, M. et al. Identifying and Reducing Interfacial Losses to Enhance Color-Pure Electroluminescence in Blue-Emitting Perovskite Nanoplatelet Light-Emitting Diodes. ACS Energy Lett. 2019, 5, 1181-1188.

Acknowledgements:

M.A. acknowledges funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 841386. We acknowledge the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (HYPERION, Grant Agreement No. 756962). S.D.S. thanks the Royal Society and Tata Group (UF150033). The authors thank the Engineering and Physical Sciences Research Council (EPSRC) for support. K.F. acknowledges a George and Lilian Schiff Studentship, Winton Studentship, the Engineering and Physical Sciences Research Council (EPSRC) studentship, Cambridge Trust Scholarship, and Robert Gardiner Scholarship.

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.

MATSUS

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.

International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics

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.