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Metikoti Jagadeeswararao, Kyu Min Sim, Sangjun Lee, Mingyun Kang, Sanghyeok An, Geon-Hee Nam, Hye Ryun Sim, Elham Oleiki, Geunsik Lee, and Dae Sung Chung
Chemistry of Materials 2023 35 (8), 3095-3104
DOI: 10.1021/acs.chemmater.2c03271
This study demonstrates high-performance photomultiplication (PM)-type photodetectors using lead-free double perovskite, achieved by engineering trap states and trap-assisted charge injection. With a diode structure, the researchers realized selective hole traps, leading to high external quantum efficiency (EQE) of ∼16,000%, responsivity of ∼50 A W−1, and specific detectivity over 10¹² Jones at -3V. The work highlights PM photodetectors' potential through strategic trap engineering.
Setfos, a Fluxim software, was used for drift-diffusion simulations to gain comprehensive insight into the photomultiplication mechanism in the proposed photodetector.
Camilla Vael, Sandra Jenatsch, Simon Züfle, Frank Nüesch, and Beat Ruhstaller
Journal of Applied Physics 131, 205702 (2022)
Simplified physical models are insufficient to describe the transient current after thermal stimulation in organic semiconductors. This is a recent finding from the group of Beat Ruhstaller. Drift-diffusion simulations obtained with the simulation software Setfos revealed the shortcomings of the physical models.
Simulations modeling is more powerful than analytical approaches for the interpretation of experimental data by accounting for non-ideal properties like exciton splitting and non-homogenous trap densities.
Jarla Thiesbrummel, Vincent M. Le Corre, Francisco Peña-Camargo, Lorena Perdigón-Toro, Felix Lang, Fengjiu Yang, Max Grischek, Emilio Gutierrez-Partida, Jonathan Warby, Michael D. Farrar, Suhas Mahesh, Pietro Caprioglio, Steve Albrecht, Dieter Neher, Henry J. Snaith, Martin Stolterfoht
Adv. Energy Mater. Sept. 2021, 2101447
doi.org/10.1002/aenm.202101447
In the paper, the researchers performed an analysis of current (performance) losses in PPV devices.
1) analyse changes in PLQY upon time (Voc -> Jsc) and link it to extraction problems caused by ions
2) perform various transient electric measurements to analyse electronic and ionic charge densities
They used the Absorption and Drift-Diffusion modules of Setfos to simulate transient current decay with mobile ions and 1) extract the ion density by fitting with experimental data, 2) show that electronic doping would not cause a current decay in contrast to ions and their experiments.
J. I. Khan, S. Alsaggaf, R. S. Ashraf, B. Purushothaman, N. Chaturvedi, I. McCulloch, F. Laquai
Phys. Stat. Sol. (RRL) (2021)
https://doi.org/10.1002/pssr.202100206
The authors investigate charge carrier generation and recombination dynamics in blends of a novel wide-bandgap germanium-containing donor polymer, namely PEHGeNDT-BT, paired with either O-IDTBR or O-IDTBCN as a non-fullerene acceptor in BHJ solar cells by (ultrafast) transient spectroscopy and time-delayed collection field (TDCF) experiments. Carrier drift-diffusion simulations of the devices’ current-voltage (J-V) characteristics confirm that the experimentally determined kinetic parameters and process yields can reproduce the measured J-V curves under steady-state solar illumination.
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