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Article ; Online: Surface Passivation Treatment to Improve Performance and Stability of Solution-Processed Metal Oxide Transistors for Hybrid Complementary Circuits on Polymer Substrates.

Kang, Moon Hyo / Armitage, John / Andaji-Garmaroudi, Zahra / Sirringhaus, Henning

Advanced science (Weinheim, Baden-Wurttemberg, Germany)

2021 Volume 8, Issue 23, Page(s) e2101502

Abstract: Hybrid integration of n-type oxide with p-type polymer transistors is an attractive approach for realizing high performance complementary circuits on flexible substrates. However, the stability of solution-processed oxide transistors is limiting the ... ...

Abstract	Hybrid integration of n-type oxide with p-type polymer transistors is an attractive approach for realizing high performance complementary circuits on flexible substrates. However, the stability of solution-processed oxide transistors is limiting the lifetime and reliability of such circuits. Oxygen vacancies are the main defect degrading metal oxide transistor performance when ambient oxygen adsorbs onto metal oxide films. Here, an effective surface passivation treatment based on negative oxygen ion exposure combined with UV light is demonstrated, that is able to significantly reduce surface oxygen vacancy concentration and improve the field effect mobility to values up to 41 cm
Language	English
Publishing date	2021-10-20
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2808093-2
ISSN	2198-3844 ; 2198-3844
ISSN (online)	2198-3844
ISSN	2198-3844
DOI	10.1002/advs.202101502
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Halide Remixing under Device Operation Imparts Stability on Mixed-Cation Mixed-Halide Perovskite Solar Cells.

Ruggeri, Edoardo / Anaya, Miguel / Gałkowski, Krzysztof / Abfalterer, Anna / Chiang, Yu-Hsien / Ji, Kangyu / Andaji-Garmaroudi, Zahra / Stranks, Samuel D

Advanced materials (Deerfield Beach, Fla.)

2022 Volume 34, Issue 36, Page(s) e2202163

Abstract: Mixed-halide mixed-cation hybrid perovskites are among the most promising perovskite compositions for application in a variety of optoelectronic devices due to their high performance, low cost, and bandgap-tuning capabilities. Instability pathways such ... ...

Abstract	Mixed-halide mixed-cation hybrid perovskites are among the most promising perovskite compositions for application in a variety of optoelectronic devices due to their high performance, low cost, and bandgap-tuning capabilities. Instability pathways such as those driven by ionic migration, however, continue to hinder their further progress. Here, an operando variable-pitch synchrotron grazing-incidence wide-angle X-ray scattering technique is used to track the surface and bulk structural changes in mixed-halide mixed-cation perovskite solar cells under continuous load and illumination. By monitoring the evolution of the material structure, it is demonstrated that halide remixing along the electric field and illumination direction during operation hinders phase segregation and limits device instability. Correlating the evolution with directionality- and depth-dependent analyses, it is proposed that this halide remixing is induced by an electrostrictive effect acting along the substrate out-of-plane direction. However, this stabilizing effect is overwhelmed by competing halide demixing processes in devices exposed to humid air or with poorer starting performance. The findings shed new light on understanding halide de- and re-mixing competitions and their impact on device longevity. These operando techniques allow real-time tracking of the structural evolution in full optoelectronic devices and unveil otherwise inaccessible insights into rapid structural evolution under external stress conditions.
Language	English
Publishing date	2022-08-07
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1474949-X
ISSN	1521-4095 ; 0935-9648
ISSN (online)	1521-4095
ISSN	0935-9648
DOI	10.1002/adma.202202163
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Article: Reversible Removal of Intermixed Shallow States by Light Soaking in Multication Mixed Halide Perovskite Films.

Guo, Dengyang / Andaji Garmaroudi, Zahra / Abdi-Jalebi, Mojtaba / Stranks, Samuel D / Savenije, Tom J

ACS energy letters

2019 Volume 4, Issue 10, Page(s) 2360–2367

Abstract: The highest reported efficiencies of metal halide perovskite (MHP) solar cells are all based on mixed perovskites, such as (FA,MA,Cs)Pb( ... ...

Abstract	The highest reported efficiencies of metal halide perovskite (MHP) solar cells are all based on mixed perovskites, such as (FA,MA,Cs)Pb(I
Language	English
Publishing date	2019-09-05
Publishing country	United States
Document type	Journal Article
ISSN	2380-8195
ISSN	2380-8195
DOI	10.1021/acsenergylett.9b01726
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Charge transport in mixed metal halide perovskite semiconductors.

Senanayak, Satyaprasad P / Dey, Krishanu / Shivanna, Ravichandran / Li, Weiwei / Ghosh, Dibyajyoti / Zhang, Youcheng / Roose, Bart / Zelewski, Szymon J / Andaji-Garmaroudi, Zahra / Wood, William / Tiwale, Nikhil / MacManus-Driscoll, Judith L / Friend, Richard H / Stranks, Samuel D / Sirringhaus, Henning

Nature materials

2023 Volume 22, Issue 2, Page(s) 216–224

Abstract: Investigation of the inherent field-driven charge transport behaviour of three-dimensional lead halide perovskites has largely remained challenging, owing to undesirable ionic migration effects near room temperature and dipolar disorder instabilities ... ...

Abstract	Investigation of the inherent field-driven charge transport behaviour of three-dimensional lead halide perovskites has largely remained challenging, owing to undesirable ionic migration effects near room temperature and dipolar disorder instabilities prevalent specifically in methylammonium-and-lead-based high-performing three-dimensional perovskite compositions. Here, we address both these challenges and demonstrate that field-effect transistors based on methylammonium-free, mixed metal (Pb/Sn) perovskite compositions do not suffer from ion migration effects as notably as their pure-Pb counterparts and reliably exhibit hysteresis-free p-type transport with a mobility reaching 5.4 cm
Language	English
Publishing date	2023-01-26
Publishing country	England
Document type	Journal Article
ZDB-ID	2088679-2
ISSN	1476-4660 ; 1476-1122
ISSN (online)	1476-4660
ISSN	1476-1122
DOI	10.1038/s41563-022-01448-2
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Article ; Online: Fast Near-Infrared Photodetectors Based on Nontoxic and Solution-Processable AgBiS

Huang, Yi-Teng / Nodari, Davide / Furlan, Francesco / Zhang, Youcheng / Rusu, Marin / Dai, Linjie / Andaji-Garmaroudi, Zahra / Darvill, Daniel / Guo, Xiaoyu / Rimmele, Martina / Unold, Thomas / Heeney, Martin / Stranks, Samuel D / Sirringhaus, Henning / Rao, Akshay / Gasparini, Nicola / Hoye, Robert L Z

Small (Weinheim an der Bergstrasse, Germany)

2023 Volume 20, Issue 18, Page(s) e2310199

Abstract: Solution-processable near-infrared (NIR) photodetectors are urgently needed for a wide range of next-generation electronics, including sensors, optical communications and bioimaging. However, it is rare to find photodetectors with >300 kHz cut-off ... ...

Abstract	Solution-processable near-infrared (NIR) photodetectors are urgently needed for a wide range of next-generation electronics, including sensors, optical communications and bioimaging. However, it is rare to find photodetectors with >300 kHz cut-off frequencies, especially in the NIR region, and many of the emerging inorganic materials explored are comprised of toxic elements, such as lead. Herein, solution-processed AgBiS
Language	English
Publishing date	2023-12-08
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2168935-0
ISSN	1613-6829 ; 1613-6810
ISSN (online)	1613-6829
ISSN	1613-6810
DOI	10.1002/smll.202310199
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Article ; Online: Manipulating Color Emission in 2D Hybrid Perovskites by Fine Tuning Halide Segregation: A Transparent Green Emitter.

Zanetta, Andrea / Andaji-Garmaroudi, Zahra / Pirota, Valentina / Pica, Giovanni / Kosasih, Felix Utama / Gouda, Laxman / Frohna, Kyle / Ducati, Caterina / Doria, Filippo / Stranks, Samuel D / Grancini, Giulia

Advanced materials (Deerfield Beach, Fla.)

2021 Volume 34, Issue 1, Page(s) e2105942

Abstract: Halide perovskite materials offer an ideal playground for easily tuning their color and, accordingly, the spectral range of their emitted light. In contrast to common procedures, this work demonstrates that halide substitution in Ruddlesden-Popper ... ...

Abstract	Halide perovskite materials offer an ideal playground for easily tuning their color and, accordingly, the spectral range of their emitted light. In contrast to common procedures, this work demonstrates that halide substitution in Ruddlesden-Popper perovskites not only progressively modulates the bandgap, but it can also be a powerful tool to control the nanoscale phase segregation-by adjusting the halide ratio and therefore the spatial distribution of recombination centers. As a result, thin films of chloride-rich perovskite are engineered-which appear transparent to the human eye-with controlled tunable emission in the green. This is due to a rational halide substitution with iodide or bromide leading to a spatial distribution of phases where the minor component is responsible for the tunable emission, as identified by combined hyperspectral photoluminescence imaging and elemental mapping. This work paves the way for the next generation of highly tunable transparent emissive materials, which can be used as light-emitting pixels in advanced and low-cost optoelectronics.
Language	English
Publishing date	2021-10-17
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1474949-X
ISSN	1521-4095 ; 0935-9648
ISSN (online)	1521-4095
ISSN	0935-9648
DOI	10.1002/adma.202105942
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Book ; Online: Generalised Framework for Controlling and Understanding Ion Dynamics with Passivated Lead Halide Perovskites

Baikie, Tomi K. / Calado, Philip / Galkowski, Krzysztof / Andaji-Garmaroudi, Zahra / Chin, Yi-Chun / Luke, Joel / Henderson, Charlie / Dunlop, Tom / McGettrick, James / Kim, Ji-Seon / Rao, Akshay / Nelson, Jenny / Stranks, Samuel D. / Barnes, Piers R. B.

2023

Abstract: Metal halide perovskite solar cells have gained widespread attention due to their high efficiency and high defect tolerance. The absorbing perovskite layer is as a mixed electron-ion conductor that supports high rates of ion and charge transport at room ... ...

Abstract	Metal halide perovskite solar cells have gained widespread attention due to their high efficiency and high defect tolerance. The absorbing perovskite layer is as a mixed electron-ion conductor that supports high rates of ion and charge transport at room temperature, but the migration of mobile defects can lead to degradation pathways. We combine experimental observations and drift-diffusion modelling to demonstrate a new framework to interpret surface photovoltage (SPV) measurements in perovskite systems and mixed electronic ionic conductors more generally. We conclude that the SPV in mixed electronic ionic conductors can be understood in terms of the change in electric potential at the surface associated with changes in the net charge within the semiconductor system. We show that by modifying the interfaces of perovskite bilayers, we may control defect migration behaviour throughout the perovskite bulk. Our new framework for SPV has broad implications for developing strategies to improve the stability of perovskite devices by controlling defect accumulation at interfaces. More generally, in mixed electronic conductors our framework provides new insights into the behaviour of mobile defects and their interaction with photoinduced charges, which are foundational to physical mechanisms in memristivity, logic, impedance, sensors and energy storage.
Keywords	Condensed Matter - Materials Science
Publishing date	2023-05-24
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Elucidating the Role of Antisolvents on the Surface Chemistry and Optoelectronic Properties of CsPbBrₓI₃₋ₓ Perovskite Nanocrystals

Journal of the American Chemical Society. 2022 June 27, v. 144, no. 27

2022

Abstract: Colloidal lead-halide perovskite nanocrystals (LHP NCs) have emerged over the past decade as leading candidates for efficient next-generation optoelectronic devices, but their properties and performance critically depend on how they are purified. While ... ...

Abstract	Colloidal lead-halide perovskite nanocrystals (LHP NCs) have emerged over the past decade as leading candidates for efficient next-generation optoelectronic devices, but their properties and performance critically depend on how they are purified. While antisolvents are widely used for purification, a detailed understanding of how the polarity of the antisolvent influences the surface chemistry and composition of the NCs is missing in the field. Here, we fill this knowledge gap by studying the surface chemistry of purified CsPbBrₓI₃₋ₓ NCs as the model system, which in itself is considered a promising candidate for pure-red light-emitting diodes and top-cells for tandem photovoltaics. Interestingly, we find that as the polarity of the antisolvent increases (from methyl acetate to acetone to butanol), there is a blueshift in the photoluminescence (PL) peak of the NCs along with a decrease in PL quantum yield (PLQY). Through transmission electron microscopy and X-ray photoemission spectroscopy measurements, we find that these changes in PL properties arise from antisolvent-induced iodide removal, which leads to a change in halide composition and, thus, the bandgap. Using detailed nuclear magnetic resonance (NMR) and Fourier-transform infrared spectroscopy (FTIR) measurements along with density functional theory calculations, we propose that more polar antisolvents favor the detachment of the oleic acid and oleylamine ligands, which undergo amide condensation reactions, leading to the removal of iodide anions from the NC surface bound to these ligands. This work shows that careful selection of low-polarity antisolvents is a critical part of designing the synthesis of NCs to achieve high PLQYs with minimal defect-mediated phase segregation.
Keywords	Fourier transform infrared spectroscopy ; X-ray photoelectron spectroscopy ; acetates ; acetone ; butanol ; density functional theory ; iodides ; ligands ; nanocrystals ; nuclear magnetic resonance spectroscopy ; oleic acid ; photoluminescence ; solar energy ; transmission electron microscopy
Language	English
Dates of publication	2022-0627
Size	p. 12102-12115.
Publishing place	American Chemical Society
Document type	Article
ZDB-ID	3155-0
ISSN	1520-5126 ; 0002-7863
ISSN (online)	1520-5126
ISSN	0002-7863
DOI	10.1021/jacs.2c02631
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Correction to Optical and Electronic Properties of Colloidal CdSe Quantum Rings.

Xiao, James / Liu, Yun / Steinmetz, Violette / Caglar, Mustafa / Mc Hugh, Jeffrey / Baikie, Tomi / Gauriot, Nicolas / Nguyen, Malgorzata / Ruggeri, Edoardo / Andaji-Garmaroudi, Zahra / Stranks, Samuel D / Legrand, Laurent / Barisien, Thierry / Friend, Richard H / Greenham, Neil C / Rao, Akshay / Pandya, Raj

ACS nano

2021 Volume 15, Issue 2, Page(s) 3540

Language	English
Publishing date	2021-01-29
Publishing country	United States
Document type	Published Erratum
ISSN	1936-086X
ISSN (online)	1936-086X
DOI	10.1021/acsnano.1c00060
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Elucidating the Role of Antisolvents on the Surface Chemistry and Optoelectronic Properties of CsPbBr

Journal of the American Chemical Society

2022 Volume 144, Issue 27, Page(s) 12102–12115

Abstract	Colloidal lead-halide perovskite nanocrystals (LHP NCs) have emerged over the past decade as leading candidates for efficient next-generation optoelectronic devices, but their properties and performance critically depend on how they are purified. While antisolvents are widely used for purification, a detailed understanding of how the polarity of the antisolvent influences the surface chemistry and composition of the NCs is missing in the field. Here, we fill this knowledge gap by studying the surface chemistry of purified CsPbBr
Language	English
Publishing date	2022-06-27
Publishing country	United States
Document type	Journal Article
ZDB-ID	3155-0
ISSN	1520-5126 ; 0002-7863
ISSN (online)	1520-5126
ISSN	0002-7863
DOI	10.1021/jacs.2c02631
Database	MEDical Literature Analysis and Retrieval System OnLINE

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