Full Text Journal Articles by
Author Qingzhi An

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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]

Cited: 0 times

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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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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]

Cited: 1 time

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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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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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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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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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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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