Results 71 to 80 of about 3,584 (216)

Role of lattice distortion and A site cation in the phase transitions of methylammonium lead halide perovskites [PDF]

Physical Review Materials, 2018
The rapid increase in power conversion efficiencies of photovoltaic devices incorporating lead halide perovskites has resulted in intense interest in the cause of their excellent properties. In the present paper, resonant ultrasound spectroscopy has been used to determine the elastic and anelastic properties of CH3NH3PbX3 (where X=Cl, Br, or I) and ...
Harwell, Jonathon R., Payne, Julia L., Sajjad, Muhammad T., Heutz, Frank J. L., Dawson, Daniel M., Whitfield, Pamela S., Irvine, John T. S., Samuel, Ifor D. W., Carpenter, Michael A.   +8 more
openaire   +3 more sources

Junction Physics and Architectural Paradigms in Optoelectronic Semiconductor Fibers

Advanced Science, EarlyView.
Optoelectronic fibers are emerging as a key platform for distributed sensing, energy harvesting, and optical communication in deformable systems. Their performance is fundamentally governed by junction formation under confined, dynamic processing conditions.
Hailiang Wang, Wenshu Ouyang, Yuhang Xiao, Wei Yan, Meifang Zhu   +4 more
wiley   +1 more source

Does Dipolar Motion of Organic Cations Affect Polaron Dynamics and Bimolecular Recombination in Halide Perovskites? [PDF]

, 2020
The role of dipolar motion of organic cations in the A-sites of halide perovskites has been debated in an effort to understand why these materials possess such remarkable properties. Here, we show that the dipolar motion of cations such as methylammonium
Jianing Gan (8682156), John R. Swartzfager (6470531), John B. Asbury (1272033), Kyle T. Munson (1597261)   +3 more
core   +1 more source

Vapor‐Phase Grain‐Boundary Anchoring Enables Molecular Toughening and Record Bending Endurance in Pilot‐Scale Roll‐to‐Roll‐Printed Flexible Perovskite Modules

Angewandte Chemie, EarlyView.
A vapor‐phase molecular toughening strategy is developed for pilot‐scale roll‐to‐roll (R2R) ‐compatible fabrication of flexible perovskite solar modules. Thiol vapor selectively regulates crystallization and anchors at grain boundaries, reducing defects while enhancing mechanical resilience.
Lirong Dong, Viktor Rehm, Shudi Qiu, Zexian Han, Naveen Harindu Hemasiri, Michael Wurmshuber, Michael Wagner, Cindy‐Ly Tavera‐Méndez, Dorothea Wisser, Chaohui Li, Robin Basu, Leopold Lahn, Olga Kasian, Sarmad Feroze, Wolfgang Heiss, Andreas Distler, Hans‐Joachim Egelhaaf, Fu Yang, Christoph J. Brabec   +18 more
wiley   +2 more sources

Mixed‐Polymer Hole Transport Layers Reinforce Au‐Anode Top Emitting Perovskite Light Emitting Diodes

Advanced Science, EarlyView.
Au‐anode corrosion is shown to occur rapidly under voltage bias in MAPbI3 perovskite LEDs. Resulting Au+ migration quickly leads to device shorting and unstable emission during constant current driving. We demonstrate that using a simple mixed‐polymer hole transport layer containing polyTPD and PVK can reduce Au‐corrosion and stabilize LED operation ...
James C. Loy, Jisu Hong, Tuo Hu, Xu He, Antoine Kahn, Barry P. Rand   +5 more
wiley   +1 more source

Advancing the Design of High‐Efficiency Printable Hole‐Conductor‐Free Mesoscopic Perovskite Solar Cells Through Machine Learning

Advanced Science, EarlyView.
Based on the largest printable mesoscopic perovskite solar cells database we established, stacking model achieved precise PCE prediction (R2 = 0.73, MAE = 2.18%). Multiple experiments verified the accuracy of the model, which guided the fabrication of high‐PCE devices with an efficiency of 19.36%.
Hao Meng, Jingzi Zhang, Xu Zhu, Yuelin Wang, Antai Yang, Kailong Hu, Chengquan Zhong, Jiakai Liu, Menghan Dun, Xi Lin   +9 more
wiley   +1 more source

Dual Interface Modification for Reduced Nonradiative Recombination in n–i–p Methylammonium-Free Perovskite Solar Cells [PDF]

High defect concentrations at the interfaces are the basis of charge extraction losses and instability in perovskite solar cells. Surface engineering with organic cations is a common practice to solve this issue.
Turren Cruz, Silver Hamill
core   +1 more source

Dry‑Contact Trimming for All‑Perovskite Tandem Solar Cells via Solid‑Solution Homogenization

Advanced Energy Materials, EarlyView.
Narrow‐bandgap Sn–Pb perovskites are promising bottom absorbers for all‐perovskite tandems but suffer from Sn‐rich surfaces and depth‐dependent lattice/compositional inhomogeneity. Layered‐perovskite‐assisted dry‐contact trimming removes Sn‐rich surface species and reconfigures the Sn–Pb absorber, enabling efficient charge collection, reduced voltage ...
Woocheol Han, Hyojin Hong, Chan Young Kim, Chan Ho Shin, Sung Yong Kim, So Eun Shin, Minhyeok Park, Giseon Yu, Sohyun Kang, Seungmin Lee, Jun Hong Noh   +10 more
wiley   +1 more source

Relationship between the Nature of Monovalent Cations and Charge Recombination in Metal Halide Perovskites [PDF]

, 2020
We report charge recombination rates in lead iodide perovskites with alloys of formamidinium (FA) and methylammonium (MA) cations, FAxMA1–xPbI3, 0 ≤ x ≤ 0.9, prepared through ion exchange with minimal differences in morphology and charge trap density ...
Ying-Zhong Ma (1343253), Katelyn A. Dagnall (8379759), Alexander Z. Chen (3928943), Mool C. Gupta (2664718), Kai Xiao (421646), Benjamin J. Foley (3928946), Matthew R. Alpert (8379765), Joshua J. Choi (1866805), Xiaoyu Deng (30845), Shelby A. Cuthriell (8379762), Seung-Hun Lee (2236066), Zeming Sun (8379768)   +11 more
core   +1 more source

Photovoltaic properties of a triple cation methylammonium/formamidinium/phenylethylammonium tin iodide perovskite

Journal of Materials Chemistry A, 2019
Solar cells based on the novel triple cation tin perovskite MA0.75FA0.15PEA0.1SnI3 exhibit PCEs of 5.0% and notably good stability over more than 5000 hours.
Thomas Rath, Jasmin Handl, Stefan Weber, Bastian Friesenbichler, Peter Fürk, Lukas Troi, Theodoros Dimopoulos, Birgit Kunert, Roland Resel, Gregor Trimmel   +9 more
openaire   +2 more sources