Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
Unraveling the structure-property relationships in hybrid lead halide perovskites is instrumental for the fundamental understanding not only of their exceptional optoelectronic performance but also their in-operando stability. Surprisingly, hybrid halide perovskites exhibit a great defect tolerance in their performance, despite their mechanical softness and the consequent low energetic barriers for point defect formation and ion migration. Recently, we have constructed the complete phase diagram of organic-cation solid-solutions of lead iodide perovskites (FAxMA1-xPbI3, where MA stands for methylammonium and FA for formamidinium) with compositions x ranging from 0 to 1 in steps of 0.1 and in the temperature range from 10 to 365 K by combining Raman scattering and photoluminescence (PL) measurements [1]. We have extended this work by studying the evolution of shallow-defect signatures observed in the PL spectra at low temperatures [2]. The strong free-exciton PL of the perovskites, apart from the discontinuous changes in the energy of its maximum at the different structural transitions, also exhibits a strong decrease in linewidth at low temperatures. This allows for the observation of the emission related to radiative recombination of bound exciton complexes (BECs) associated with shallow defects (donor and/or acceptor). We report a tentative assignment of all PL features to the different shallow-defects typically present in hybrid perovskites, attained with the aid of state of the art ab-initio calculations [3]. The defect-related signatures exhibit a clear trend regarding the composition of the mixed crystals, indicating that the material becomes less prone to defect formation with increasing FA content.
The Spanish Ministerio de Ciencia e Innovación is gratefully acknowledged for its support through grants No. SEV-2015-0496 (FUNMAT) and CEX2019-000917-S (FUNFUTURE) in the framework of the Spanish Severo Ochoa Centre of Excellence program and through grants MAT2015-70850-P (HIBRI2) and PGC2018-095411-B-100 (RAINBOW). We also thank the Catalan agency AGAUR for grant 2017-SGR-00488. AFL acknowledges a FPI fellowship (BES-2016-076913) from the Spanish Ministerio co-financed by the European Social Fund and the PhD programme in Materials Science from Universitat Autònoma de Barcelona in which he was enrolled. BC thanks the EPSRC for PhD studentship funding via the CSCT CDT (EP/G03768X/1).
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.