Sandheep Ravishankar
@sandheepravish1
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Team leader, IMD-3 photovoltaics, Forschungszentrum Jülich https://t.co/SAVlEu3X9n
Aachen, Germany
Joined April 2020
Here is Yueming's paper - a loss analysis of perovskite solar cells on planar and textured substrates. The texturing improved the absorptance with no additional fill factor losses. We also found that the tr-PL response is dominated by shallow traps.
onlinelibrary.wiley.com
The deposition of high-quality wide-bandgap perovskite films on textured surfaces is crucial to develop effective perovskite–silicon tandem cells with small pyramidal structures. Textured substrates...
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We have two PhD positions and one postdoctoral position available, interested candidates can apply using the links below. PhD positions:. Postdoc position:. 2/2.
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Happy to announce that I have been awarded the Emmy-Noether grant by the @dfg_public to lead a new research group at IMD-3 Photovoltaics (@fzj_iek) in @fz_juelich, working on the characterization and simulation of emerging solar cells. 1/2.
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RT @nanoUPOsc: Deadline for oral abstracts approaching (20th). be welcome to early spring in the capital of sunny Al Andalus.@FluximAG @s….
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RT @FluximAG: "Discerning Rise Time Constants in Perovskite Solar Cells" by Sandheep Ravishankar & team at Forschungszentrum Jülich. A brea….
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RT @FluximAG: Research #Webinar: Join our webinar on #Perovskite Solar Cells with experts Dr. Sandeep Ravishankar & Dr. Sandra Jenatsch. Ex….
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RT @FluximAG: Research #Webinar: Join our webinar on #Perovskite Solar Cells with experts Dr. Sandeep Ravishankar & Dr. Sandra Jenatsch. Ex….
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RT @FluximAG: Fluxim's Monthly Newsletter is Your Key to the Latest in #Perovskite #Research & Tech Advancements. Read it here: https://t.c….
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RT @FluximAG: Research #Webinar: Join our webinar on #Perovskite Solar Cells with experts Dr. Sandeep Ravishankar & Dr. Sandra Jenatsch. Ex….
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RT @pvmagazine: ‘Shallow defects’ key to high efficiency of perovskite solar cells, say researchers: Researchers at the Jülich Research Cen….
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RT @FluximAG: "Discerning Rise Time Constants in Perovskite Solar Cells" by Sandheep Ravishankar & team at Forschungszentrum Jülich. A brea….
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The large FOM values indicate that a significant electric field exists in the transport layers at or close to the 1 sun open-circuit voltage, that allows for efficient charge collection.
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We calculate this FOM using the IMVS and TPV rise time constants of a full device and the effective recombination lifetimes from tr-PL measurements of a glass/ITO/HTL/perovskite/ETL stack.
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The charge collection efficiency is then governed by a figure of merit (FOM) that depends on the voltage-dependent charge extraction and recombination time constants.
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We define a modified transfer function that focusses on the real part of the original transfer function, which extracts the rise time constant from the data. This confirms that the same information is available in both the time and frequency domain measurements.
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@fzj_iek @FluximAG Information regarding charge extraction is embedded in the rise of the photovoltage/photocurrent via the rise time constant. However, this time constant is not observed in the frequency domain from the traditional analysis of the negative imaginary part of the transfer function.
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Our latest paper is online, link below. We combine transient photovoltage (TPV), IMVS (frequency domain) and transient photoluminescence (tr-PL) measurements to determine the charge extraction efficiency in our perovskite solar cells. @fzj_iek @FluximAG.
pubs.rsc.org
The small-perturbation analysis of perovskite solar cells (PSCs) highlights a fundamental conundrum – while time domain measurements yield two time constants corresponding to the rise and subsequent...
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RT @nanoGe_Conf: 🔺Closing an amazing first day of #DEPERO Online Conference on "Device Physics Characterization and Interpretation in Perov….
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RT @nanoGe_Conf: 🔺#DEPERO Online Conference on 'Device Physics Characterization and Interpretation in Perovskite and Organic Materials' is….
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