Origin of Light-Induced Photophysical Effects in Organic Metal Halide Perovskites in the Presence of Oxygen.
TLDR
Analyzing the changes occurring at the semiconductor surface upon photoexcitation under a controlled oxygen atmosphere in an X-ray photoelectron spectroscopy (XPS) chamber can rationalize the rich variety of photophysical phenomena observed and provide a plausible explanation for light-induced ion migration.Abstract:
Herein we present a combined study of the evolution of both the photoluminescence (PL) and the surface chemical structure of organic metal halide perovskites as the environmental oxygen pressure rises from ultrahigh vacuum up to a few thousandths of an atmosphere. Analyzing the changes occurring at the semiconductor surface upon photoexcitation under a controlled oxygen atmosphere in an X-ray photoelectron spectroscopy (XPS) chamber, we can rationalize the rich variety of photophysical phenomena observed and provide a plausible explanation for light-induced ion migration, one of the most conspicuous and debated concomitant effects detected during photoexcitation. We find direct evidence of the formation of a superficial layer of negatively charged oxygen species capable of repelling the halide anions away from the surface and toward the bulk. The reported PL transient dynamics, the partial recovery of the initial state when photoexcitation stops, and the eventual degradation after intense exposure times c...read more
Citations
More filters
Journal ArticleDOI
Consensus statement for stability assessment and reporting for perovskite photovoltaics based on ISOS procedures
Mark V. Khenkin,Mark V. Khenkin,Eugene A. Katz,Antonio Abate,Giorgio Bardizza,Joseph J. Berry,Christoph J. Brabec,Christoph J. Brabec,Francesca Brunetti,Vladimir Bulovic,Quinn Burlingame,Aldo Di Carlo,Rongrong Cheacharoen,Yi-Bing Cheng,Alexander Colsmann,Stéphane Cros,Konrad Domanski,Michał Dusza,Christopher J. Fell,Stephen R. Forrest,Yulia Galagan,Diego Di Girolamo,Diego Di Girolamo,Michael Grätzel,Anders Hagfeldt,Elizabeth von Hauff,Harald Hoppe,Jeff Kettle,Hans Köbler,Marina S. Leite,Marina S. Leite,Shengzhong Frank Liu,Shengzhong Frank Liu,Yueh-Lin Loo,Joseph M. Luther,Chang-Qi Ma,Morten Madsen,Matthieu Manceau,Muriel Matheron,Michael D. McGehee,Michael D. McGehee,Rico Meitzner,Mohammad Khaja Nazeeruddin,Ana Flávia Nogueira,çaǧla Odabaşı,Anna Osherov,Nam-Gyu Park,Matthew O. Reese,Francesca De Rossi,Francesca De Rossi,Michael Saliba,Michael Saliba,Ulrich S. Schubert,Henry J. Snaith,Samuel D. Stranks,Wolfgang Tress,Pavel A. Troshin,Vida Turkovic,Sjoerd Veenstra,Iris Visoly-Fisher,Aron Walsh,Aron Walsh,Trystan Watson,Haibing Xie,Ramazan Yildirim,Shaik M. Zakeeruddin,Kai Zhu,Monica Lira-Cantu +67 more
TL;DR: A consensus between researchers in the field is reported on procedures for testing perovskite solar cell stability, which are based on the International Summit on Organic Photovoltaic Stability (ISOS) protocols, and additional procedures to account for properties specific to PSCs are proposed.
Journal ArticleDOI
Heterogeneity at multiple length scales in halide perovskite semiconductors
TL;DR: In this article, the authors highlight the multiple layers of heterogeneity in halide perovskites and assess the impact of these non-uniformities on their optoelectronic properties and how the heterogeneity may even be beneficial for device properties.
Journal ArticleDOI
Investigation of Oxygen Passivation for High-Performance All-Inorganic Perovskite Solar Cells
TL;DR: O-passivated IHP solar cells exhibit enhanced power conversion efficiency (PCE) and better air stability than O2-passivation cells, and demonstrate the great potential of IHPs for high photovoltaic performance with simplified ambient processing.
Journal ArticleDOI
Artemisinin-passivated mixed-cation perovskite films for durable flexible perovskite solar cells with over 21% efficiency
TL;DR: In this paper, the use of artemisinin, an herb extract, to passivate the perovskite grains to improve the VOC and FF of flexible PSCs significantly was reported.
Journal ArticleDOI
The Role of Grain Boundaries on Ionic Defect Migration in Metal Halide Perovskites
Nga Phung,Amran Al-Ashouri,Simone Meloni,Alessandro Mattoni,Steve Albrecht,Steve Albrecht,Eva L. Unger,Eva L. Unger,Aboma Merdasa,Aboma Merdasa,Antonio Abate,Antonio Abate +11 more
Abstract: Halide perovskites are emerging as revolutionary materials for optoelectronics. Their ionic nature and the presence of mobile ionic defects within the crystal structure have a dramatic influence on the operation of thin-film devices such as solar cells, light-emitting diodes, and transistors. Thin films are often polycrystalline and it is still under debate how grain boundaries affect the migration of ions and corresponding ionic defects. Laser excitation during photoluminescence (PL) microscopy experiments leads to formation and subsequent migration of ionic defects, which affects the dynamics of charge carrier recombination. From the microscopic observation of lateral PL distribution, the change in the distribution of ionic defects over time can be inferred. Resolving the PL dynamics in time and space of single crystals and thin films with different grain sizes thus, provides crucial information about the influence of grain boundaries on the ionic defect movement. In conjunction with experimental observations, atomistic simulations show that defects are trapped at the grain boundaries, thus inhibiting their diffusion. Hence, with this study, a comprehensive picture highlighting a fundamental property of the material is provided while also setting a theoretical framework in which the interaction between grain boundaries and ionic defect migration can be understood. (Less)
References
More filters
Journal ArticleDOI
Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic Cells
TL;DR: Two organolead halide perovskite nanocrystals were found to efficiently sensitize TiO(2) for visible-light conversion in photoelectrochemical cells, which exhibit strong band-gap absorptions as semiconductors.
Journal ArticleDOI
Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide Perovskites
Michael M. Lee,Joël Teuscher,Tsutomu Miyasaka,Takurou N. Murakami,Takurou N. Murakami,Henry J. Snaith +5 more
TL;DR: A low-cost, solution-processable solar cell, based on a highly crystalline perovskite absorber with intense visible to near-infrared absorptivity, that has a power conversion efficiency of 10.9% in a single-junction device under simulated full sunlight is reported.
Journal ArticleDOI
Hartree-Slater subshell photoionization cross-sections at 1254 and 1487 eV.
TL;DR: In this article, the results of photoelectric cross-sections for the Kα lines of magnesium at 1254 eV and of aluminum at 1487 eV were given for Z values up to 96.
Journal ArticleDOI
Bright light-emitting diodes based on organometal halide perovskite
Zhi-Kuang Tan,Reza Saberi Moghaddam,May Ling Lai,Pablo Docampo,Ruben Higler,Felix Deschler,Michael Price,Aditya Sadhanala,Luis M. Pazos,Dan Credgington,Fabian C. Hanusch,Thomas Bein,Henry J. Snaith,Richard H. Friend +13 more
TL;DR: It is shown, using photoluminescence studies, that radiative bimolecular recombination is dominant at higher excitation densities, Hence, the quantum efficiencies of the perovskite light-emitting diodes increase at higher current densities.
Journal ArticleDOI
6.5% efficient perovskite quantum-dot-sensitized solar cell
TL;DR: Perovskite QD-sensitized 3.6 μm-thick TiO(2) film shows maximum external quantum efficiency (EQE) of 78.6% at 530 nm and solar-to-electrical conversion efficiency of 6.54% at AM 1.5G 1 sun intensity (100 mW cm(-2)), which is by far the highest efficiency among the reported inorganic quantum dot sensitizers.