ORCID Profile
0000-0001-9026-7064
Current Organisation
University of Oxford
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Publisher: American Chemical Society (ACS)
Date: 30-04-2018
Publisher: Springer Science and Business Media LLC
Date: 10-11-2016
DOI: 10.1038/NCOMMS13303
Abstract: Optoelectronic devices based on hybrid halide perovskites have shown remarkable progress to high performance. However, despite their apparent success, there remain many open questions about their intrinsic properties. Single crystals are often seen as the ideal platform for understanding the limits of crystalline materials, and recent reports of rapid, high-temperature crystallization of single crystals should enable a variety of studies. Here we explore the mechanism of this crystallization and find that it is due to reversible changes in the solution where breaking up of colloids, and a change in the solvent strength, leads to supersaturation and subsequent crystallization. We use this knowledge to demonstrate a broader range of processing parameters and show that these can lead to improved crystal quality. Our findings are therefore of central importance to enable the continued advancement of perovskite optoelectronics and to the improved reproducibility through a better understanding of factors influencing and controlling crystallization.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0EE00132E
Abstract: By correlating photovoltaic and material properties with metal content, we identify compositional ranges of low and high optoelectronic quality in (FA 0.83 Cs 0.17 )(Pb 1−y Sn y )I 3 perovskites.
Publisher: American Chemical Society (ACS)
Date: 21-08-2019
Publisher: Wiley
Date: 02-12-2015
Abstract: A general strategy for the in-plane structuring of organic-inorganic perovskite films is presented. The method is used to fabricate an industrially relevant distributed feedback (DFB) cavity, which is a critical step toward all-electrially pumped injection laser diodes. This approach opens the prospects of perovskite materials for much improved optical control in LEDs, solar cells, and also toward applications as optical devices.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6EE02373H
Abstract: We present a new solvent system which has the potential to overcome the manufacturing barriers associated with the currently used toxic high boiling point solvents.
Publisher: Wiley
Date: 11-12-2019
Abstract: Halide perovskites are currently one of the most heavily researched emerging photovoltaic materials. Despite achieving remarkable power conversion efficiencies, perovskite solar cells have not yet achieved their full potential, with the interfaces between the perovskite and the charge‐selective layers being where most recombination losses occur. In this study, a fluorinated ionic liquid (IL) is employed to modify the perovskite/SnO 2 interface. Using Kelvin probe and photoelectron spectroscopy measurements, it is shown that depositing the perovskite onto an IL‐treated substrate results in the crystallization of a perovskite film which has a more n‐type character, evidenced by a decrease of the work function and a shift of the Fermi level toward the conduction band. Photoluminescence spectroscopy and time‐resolved microwave conductivity are used to investigate the optoelectronic properties of the perovskite grown on neat and IL‐modified surfaces and it is found that the modified substrate yields a perovskite film which exhibits an order of magnitude lower trap density than the control. When incorporated into solar cells, this interface modification results in a reduction in the current–voltage hysteresis and an improvement in device performance, with the best performing devices achieving steady‐state PCEs exceeding 20%.
Publisher: American Chemical Society (ACS)
Date: 31-01-2017
DOI: 10.1021/ACS.JPCLETT.6B02682
Abstract: A
Publisher: American Association for the Advancement of Science (AAAS)
Date: 03-07-2020
Abstract: Ionic liquids have been shown to stabilize organic-inorganic perovskite solar cells with metal oxide carrier-transport layers, but they are incompatible with more readily processible organic analogs. Lin et al. found that an ionic solid, a piperidinium salt, enhanced the efficiency of positive-intrinsic-negative layered perovskite solar cells with organic electron and hole extraction layers. Aggressive aging testing showed that this additive retarded segregation into impurity phases and pinhole formation in the perovskite layer. Science , this issue p. 96
Publisher: American Chemical Society (ACS)
Date: 17-04-2020
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Bernard Wenger.