Full Text Journal Articles by
Author Yana Vaynzof

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Electrical Pumping of Perovskite Diodes: Toward Stimulated Emission.

Changsoon Cho, Tobias Antrack, Martin Kroll, Qingzhi An, Toni R Bärschneider, Axel Fischer, Stefan Meister, Yana Vaynzof, Karl Leo,

The success of metal halide perovskites in photovoltaic and light-emitting diodes (LEDs) motivates their application as a solid-state thin-film laser. Various perovskites have shown optically pumped stimulated emission of lasing and amplified spontaneous emission (ASE), yet the ultimate goal of electrically pumped stimulated emission has not been achieved. As an ... Read more >>

Adv Sci (Weinh) (Advanced science (Weinheim, Baden-Wurttemberg, Germany))
[2021, :e2101663]

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Are Shockley-Read-Hall and ABC models valid for lead halide perovskites?

Alexander Kiligaridis, Pavel A Frantsuzov, Aymen Yangui, Sudipta Seth, Jun Li, Qingzhi An, Yana Vaynzof, Ivan G Scheblykin,

Metal halide perovskites are an important class of emerging semiconductors. Their charge carrier dynamics is poorly understood due to limited knowledge of defect physics and charge carrier recombination mechanisms. Nevertheless, classical ABC and Shockley-Read-Hall (SRH) models are ubiquitously applied to perovskites without considering their validity. Herein, an advanced technique mapping photoluminescence quantum ... Read more >>

Nat Commun (Nature communications)
[2021, 12(1):3329]

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Doped Organic Hole Extraction Layers in Efficient PbS and AgBiS2 Quantum Dot Solar Cells.

David Becker-Koch, Miguel Albaladejo-Siguan, Yvonne J Hofstetter, Olga Solomeshch, Darius Pohl, Bernd Rellinghaus, Nir Tessler, Yana Vaynzof,

The efficiency of PbS quantum dot (QD) solar cells has significantly increased in recent years, strengthening their potential for industrial applications. The vast majority of state-of-the-art devices utilize 1,2-ethanedithiol (EDT)-coated PbS QD hole extraction layers, which lead to high initial performance, but result in poor device stability. While excellent performance ... Read more >>

ACS Appl Mater Interfaces (ACS applied materials & interfaces)
[2021, 13(16):18750-18757]

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A general approach to high-efficiency perovskite solar cells by any antisolvent.

Alexander D Taylor, Qing Sun, Katelyn P Goetz, Qingzhi An, Tim Schramm, Yvonne Hofstetter, Maximillian Litterst, Fabian Paulus, Yana Vaynzof,

Deposition of perovskite films by antisolvent engineering is a highly common method employed in perovskite photovoltaics research. Herein, we report on a general method that allows for the fabrication of highly efficient perovskite solar cells by any antisolvent via manipulation of the antisolvent application rate. Through detailed structural, compositional, and ... Read more >>

Nat Commun (Nature communications)
[2021, 12(1):1878]

Cited: 1 time

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Probing the ionic defect landscape in halide perovskite solar cells.

Sebastian Reichert, Qingzhi An, Young-Won Woo, Aron Walsh, Yana Vaynzof, Carsten Deibel,

Point defects in metal halide perovskites play a critical role in determining their properties and optoelectronic performance; however, many open questions remain unanswered. In this work, we apply impedance spectroscopy and deep-level transient spectroscopy to characterize the ionic defect landscape in methylammonium lead triiodide (MAPbI<sub>3</sub>) perovskites in which defects were ... Read more >>

Nat Commun (Nature communications)
[2020, 11(1):6098]

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Enhancing the Efficiency and Stability of Triple-Cation Perovskite Solar Cells by Eliminating Excess PbI2 from the Perovskite/Hole Transport Layer Interface.

Zhelu Hu, Qingzhi An, Hengyang Xiang, Lionel Aigouy, Baoquan Sun, Yana Vaynzof, Zhuoying Chen,

Metal halide perovskites are promising contenders for next-generation photovoltaic applications due to their remarkable photovoltaic efficiency and their compatibility with solution-processed fabrication. Among the various strategies to control the crystallinity and the morphology of the perovskite active layer and its interfaces with the transport layers, fabrication of perovskite solar cells ... Read more >>

ACS Appl Mater Interfaces (ACS applied materials & interfaces)
[2020, 12(49):54824-54832]

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Ruddlesden-Popper-Phase Hybrid Halide Perovskite/Small-Molecule Organic Blend Memory Transistors.

Murali Gedda, Emre Yengel, Hendrik Faber, Fabian Paulus, Joshua A Kreß, Ming-Chun Tang, Siyuan Zhang, Christina A Hacker, Prashant Kumar, Dipti R Naphade, Yana Vaynzof, George Volonakis, Feliciano Giustino, Thomas D Anthopoulos,

Controlling the morphology of metal halide perovskite layers during processing is critical for the manufacturing of optoelectronics. Here, a strategy to control the microstructure of solution-processed layered Ruddlesden-Popper-phase perovskite films based on phenethylammonium lead bromide ((PEA)<sub>2</sub> PbBr<sub>4</sub> ) is reported. The method relies on the addition of the organic semiconductor ... Read more >>

Adv Mater (Advanced materials (Deerfield Beach, Fla.))
[2021, 33(7):e2003137]

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Sustainability in Perovskite Solar Cells.

Katelyn P Goetz, Alexander D Taylor, Yvonne J Hofstetter, Yana Vaynzof,

At a current value of 25.5%, perovskites have reached some of the highest power conversion efficiencies of all single-junction solar cell devices. Researchers, however, are questioning their readiness for the commercial market, citing reasons of the toxicity of the lead-based active layer and instability. Closer examination of the life cycle ... Read more >>

ACS Appl Mater Interfaces (ACS applied materials & interfaces)
[2021, 13(1):1-17]

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2D/3D Perovskite Engineering Eliminates Interfacial Recombination Losses in Hybrid Perovskite Solar Cells

Albertus Adrian Sutanto, Pietro Caprioglio, Nikita Drigo, Yvonne Hofstetter, Ines Garcia Benito, Valentin Queloz, Dieter Neher, MOHAMMAD KHAJA Nazeeruddin, Martin Stolterfoht, Yana Vaynzof, Giulia Grancini,

Engineering two-dimensional (2D) / three-dimensional (3D) perovskites has emerged as an attractive route to efficient and durable perovskite solar cells. Beyond improving the surface stability of the 3D layer and acting as a trap passivation agent, the exact function of 2D/3D device interface remains vague. Here, we provide evidence that ... Read more >>

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Efficient and Stable PbS Quantum Dot Solar Cells by Triple-Cation Perovskite Passivation.

Miguel Albaladejo-Siguan, David Becker-Koch, Alexander D Taylor, Qing Sun, Vincent Lami, Pola Goldberg Oppenheimer, Fabian Paulus, Yana Vaynzof,

Solution-processed quantum dots (QDs) have a high potential for fabricating low-cost, flexible, and large-scale solar energy harvesting devices. It has recently been demonstrated that hybrid devices employing a single monovalent cation perovskite solution for PbS QD surface passivation exhibit enhanced photovoltaic performance when compared to standard ligand passivation. Herein, we ... Read more >>

ACS Nano (ACS nano)
[2020, 14(1):384-393]

Cited: 1 time

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Vacuum-Induced Degradation of 2D Perovskites.

Yvonne J Hofstetter, Inés García-Benito, Fabian Paulus, Simonetta Orlandi, Giulia Grancini, Yana Vaynzof,

Two-dimensional (2D) hybrid organic-inorganic perovskites have recently attracted the attention of the scientific community due to their exciting optical and electronic properties as well as enhanced stability upon exposure to environmental factors. In this work, we investigate 2D perovskite layers with a range of organic cations and report on the ... Read more >>

Front Chem (Frontiers in chemistry)
[2020, 8:66]

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Enhancing the Open-Circuit Voltage of Perovskite Solar Cells by Embedding Molecular Dipoles within Their Hole-Blocking Layer.

Julian F Butscher, Sebastian Intorp, Joshua Kress, Qingzhi An, Yvonne J Hofstetter, Nikolai Hippchen, Fabian Paulus, Uwe H F Bunz, Nir Tessler, Yana Vaynzof,

Engineering the energetics of perovskite photovoltaic devices through deliberate introduction of dipoles to control the built-in potential of the devices offers an opportunity to enhance their performance without the need to modify the active layer itself. In this work, we demonstrate how the incorporation of molecular dipoles into the bathocuproine ... Read more >>

ACS Appl Mater Interfaces (ACS applied materials & interfaces)
[2020, 12(3):3572-3579]

Cited: 1 time

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Tuning Spin Current Injection at Ferromagnet-Nonmagnet Interfaces by Molecular Design.

Angela Wittmann, Guillaume Schweicher, Katharina Broch, Jiri Novak, Vincent Lami, David Cornil, Erik R McNellis, Olga Zadvorna, Deepak Venkateshvaran, Kazuo Takimiya, Yves H Geerts, Jérôme Cornil, Yana Vaynzof, Jairo Sinova, Shun Watanabe, Henning Sirringhaus,

There is a growing interest in utilizing the distinctive material properties of organic semiconductors for spintronic applications. Here, we explore the injection of pure spin current from Permalloy into a small molecule system based on dinaphtho[2,3-b:2,3-f]thieno[3,2-b]thiophene (DNTT) at ferromagnetic resonance. The unique tunability of organic materials by molecular design allows ... Read more >>

Phys Rev Lett (Physical review letters)
[2020, 124(2):027204]

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Effect of Precursor Stoichiometry on the Performance and Stability of MAPbBr3 Photovoltaic Devices.

Lukas M Falk, Katelyn P Goetz, Vincent Lami, Qingzhi An, Paul Fassl, Jonas Herkel, Fabian Thome, Alexander D Taylor, Fabian Paulus, Yana Vaynzof,

The wide-bandgap methylammonium lead bromide perovskite is promising for applications in tandem solar cells and light-emitting diodes. Despite its utility, there is a limited understanding of its reproducibility and stability. Herein, the dependence of the properties, performance, and shelf storage of thin films and devices on minute changes to the ... Read more >>

Energy Technol (Weinh) (Energy technology (Weinheim, Germany))
[2020, 8(4):1900737]

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Room-Temperature Stimulated Emission and Lasing in Recrystallized Cesium Lead Bromide Perovskite Thin Films.

Neda Pourdavoud, Tobias Haeger, Andre Mayer, Piotr Jacek Cegielski, Anna Lena Giesecke, Ralf Heiderhoff, Selina Olthof, Stefan Zaefferer, Ivan Shutsko, Andreas Henkel, David Becker-Koch, Markus Stein, Marko Cehovski, Ouacef Charfi, Hans-Hermann Johannes, Detlef Rogalla, Max Christian Lemme, Martin Koch, Yana Vaynzof, Klaus Meerholz, Wolfgang Kowalsky, Hella-Christin Scheer, Patrick Görrn, Thomas Riedl,

Cesium lead halide perovskites are of interest for light-emitting diodes and lasers. So far, thin-films of CsPbX<sub>3</sub> have typically afforded very low photoluminescence quantum yields (PL-QY < 20%) and amplified spontaneous emission (ASE) only at cryogenic temperatures, as defect related nonradiative recombination dominated at room temperature (RT). There is a ... Read more >>

Adv Mater (Advanced materials (Deerfield Beach, Fla.))
[2019, 31(39):e1903717]

Cited: 6 times

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Azaarene Dimers.

Sebastian Hahn, Julian Butscher, Qingzhi An, Angelina Jocic, Olena Tverskoy, Marcus Richter, Xinliang Feng, Frank Rominger, Yana Vaynzof, Uwe H F Bunz,

Binaphthyl-3,3',4,4'-tetraone was prepared and coupled to different bis(TIPS-ethynyl)-substituted (TIPS=triisopropyl silane) aromatic diamines, resulting in the formation of dimeric benzo-fused azaacenes, centrally connected by a single bond. The two halves of the molecules are highly twisted with respect to each other and showed limited electronic interaction in the ground state because ... Read more >>

Chemistry (Chemistry (Weinheim an der Bergstrasse, Germany))
[2019, 25(30):7285-7291]

Cited: 1 time

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Effect of Crystal Grain Orientation on the Rate of Ionic Transport in Perovskite Polycrystalline Thin Films.

Paul Fassl, Simon Ternes, Vincent Lami, Yuriy Zakharko, Daniel Heimfarth, Paul E Hopkinson, Fabian Paulus, Alexander D Taylor, Jana Zaumseil, Yana Vaynzof,

In this work, we examine the effect of microstructure on ion-migration-induced photoluminescence (PL) quenching in methylammonium lead iodide perovskite films. Thin films were fabricated by two methods: spin-coating, which results in randomly oriented perovskite grains, and zone-casting, which results in aligned grains. As an external bias is applied to these ... Read more >>

ACS Appl Mater Interfaces (ACS applied materials & interfaces)
[2019, 11(2):2490-2499]

Cited: 1 time

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Probing charge transfer states at organic and hybrid internal interfaces by photothermal deflection spectroscopy.

David Becker-Koch, Boris Rivkin, Fabian Paulus, Hengyang Xiang, Yifan Dong, Zhuoying Chen, Artem A Bakulin, Yana Vaynzof,

In organic and hybrid photovoltaic devices, the asymmetry required for charge separation necessitates the use of a donor and an acceptor material, resulting in the formation of internal interfaces in the device active layer. While the core objective of these interfaces is to facilitate charge separation, bound states between electrons ... Read more >>

J Phys Condens Matter (Journal of physics. Condensed matter : an Institute of Physics journal)
[2019, 31(12):124001]

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Electroluminescence from Solution-Processed Pinhole-Free Nanometer-Thickness Layers of Conjugated Polymers.

Carol Newby, Thomas H Piachaud, Yana Vaynzof, Jin-Kyun Lee, Seok-Heon Jung, Aditya Sadhanala, Christopher K Ober, Richard H Friend,

We report the formation of robust, reproducible, pinhole-free, thin layers of fluorinated polyfluorene conjugated copolymers on a range of polymeric underlayers via a simple solution processing method. This is driven by the different characters of the fluorinated and nonfluorinated sections of these polymers. Photothermal deflection spectroscopy is used to determine ... Read more >>

Nano Lett (Nano letters)
[2018, 18(9):5382-5388]

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Effect of Ion Migration-Induced Electrode Degradation on the Operational Stability of Perovskite Solar Cells.

Boris Rivkin, Paul Fassl, Qing Sun, Alexander D Taylor, Zhuoying Chen, Yana Vaynzof,

Perovskite-based solar cells are promising because of their rapidly improving efficiencies but suffer from instability issues. Recently, it has been claimed that one of the key contributors to the instability of perovskite solar cells is ion migration-induced electrode degradation, which can be avoided by incorporating inorganic hole-blocking layers (HBLs) in ... Read more >>

ACS Omega (ACS omega)
[2018, 3(8):10042-10047]

Cited: 2 times

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Efficient n-Doping and Hole Blocking in Single-Walled Carbon Nanotube Transistors with 1,2,4,5-Tetrakis(tetramethylguanidino)ben-zene.

Severin Schneider, Maximilian Brohmann, Roxana Lorenz, Yvonne J Hofstetter, Marcel Rother, Eric Sauter, Michael Zharnikov, Yana Vaynzof, Hans-Jörg Himmel, Jana Zaumseil,

Efficient, stable, and solution-based n-doping of semiconducting single-walled carbon nanotubes (SWCNTs) is highly desired for complementary circuits but remains a significant challenge. Here, we present 1,2,4,5-tetrakis(tetramethylguanidino)benzene (ttmgb) as a strong two-electron donor that enables the fabrication of purely n-type SWCNT field-effect transistors (FETs). We apply ttmgb to networks of monochiral, ... Read more >>

ACS Nano (ACS nano)
[2018, 12(6):5895-5902]

Cited: 4 times

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The Gold(I)-Mediated Domino Reaction to Fused Diphenyl Phosphoniumfluorenes: Mechanistic Consequences for Gold-Catalyzed Hydroarylations and Application in Solar Cells.

Sebastian Arndt, Jan Borstelmann, Rebeka Eshagh Saatlo, Patrick W Antoni, Frank Rominger, Matthias Rudolph, Qingzhi An, Yana Vaynzof, A Stephen K Hashmi,

A domino sequence, involving a phosphinoauration and a gold-catalyzed 6-endo-dig cyclization step, was developed. Starting from modular and simple-to-prepare phosphadiynes, π-extended phosphoniumfluorenes were synthesized. The mechanistic proposal was supported by kinetic measurements and by the trapping of key intermediates. These led to important conclusions for the gold-catalyzed hydroarylation mechanism. Cyclic ... Read more >>

Chemistry (Chemistry (Weinheim an der Bergstrasse, Germany))
[2018, 24(31):7882-7889]

Cited: 3 times

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Triptycene-Bis(aroyleneimidazole)s as Non-Fullerene Acceptors: The Missing Links.

Elisabeth H Menke, David Leibold, Felix J Berger, Frank Rominger, Yana Vaynzof, Michael Mastalerz,

The syntheses of four triptycene-bis(aroyleneimidazole)s-the missing links with respect to the previously reported triptycene-mono(aroyleneimidazole)s and triptycene-tris(aroyleneimidazole)s-are presented. Their optoelectronic properties and use as non-fullerene acceptors in organic photovoltaics with poly({4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl}[3-fluoro-2-(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl) (PTB7) as a donor are described; these systems reach a maximum power conversion efficiency of 2 %. Furthermore, the effect of ... Read more >>

Chempluschem (ChemPlusChem)
[2017, 82(12):1390-1395]

Cited: 1 time

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Effect of Injection Layer Sub-Bandgap States on Electron Injection in Organic Light-Emitting Diodes.

Carsten Hinzmann, Osnat Magen, Yvonne J Hofstetter, Paul E Hopkinson, Nir Tessler, Yana Vaynzof,

It is generally considered that the injection of charges into an active layer of an organic light-emitting diode (OLED) is solely determined by the energetic injection barrier formed at the device interfaces. Here, we demonstrate that the density of surface states of the electron-injecting ZnO layer has a profound effect ... Read more >>

ACS Appl Mater Interfaces (ACS applied materials & interfaces)
[2017, 9(7):6220-6227]

Cited: 6 times

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Partial oxidation of the absorber layer reduces charge carrier recombination in antimony sulfide solar cells.

Karl C Gödel, Bart Roose, Aditya Sadhanala, Yana Vaynzof, Sandeep K Pathak, Ullrich Steiner,

We investigate the effect of a post heat treatment of the absorber layer in air for antimony sulfide (Sb<sub>2</sub>S<sub>3</sub>) sensitized solar cells. Phenomenologically, exposing the Sb<sub>2</sub>S<sub>3</sub> surface of sensitised solar cells to air at elevated temperatures is known to improve device performance. Here, we have investigated the detailed origins of ... Read more >>

Phys Chem Chem Phys (Physical chemistry chemical physics : PCCP)
[2017, 19(2):1425-1430]

Cited: 2 times

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