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Sub-0.6 eV Inverted Metamorphic GaInAs Cells Grown on InP and GaAs Substrates for Thermophotovoltaics and Laser Power Conversion

Autor: Schulte, Kevin L., Friedman, Daniel J., Dada, Titilope, Guthrey, Harvey L., da Costa, Edgard Winter, Tervo, Eric J., France, Ryan M., Geisz, John F., Steiner, Myles A.

We present inverted metamorphic Ga0.3In0.7As photovoltaic converters with sub-0.60 eV bandgaps grown on InP and GaAs substrates. The compositionally graded buffers in these devices have threading dislocation densities of 1.3x10^6 cm^-2 and 8.9x10^6 c

Externí odkaz: http://arxiv.org/abs/2310.08727

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Spectral effects on the energy harvesting efficiency of 2- and 4-terminal tandem photovoltaics

Autor: Witteck, Robert, Geisz, John. F., Warren, Emily. L., McMahon, William. E.

In this work, we investigate how a varying spectral irradiance and top cell bandgap affect the energy yield of 2T and 4T perovskite//silicon tandem solar cells under outdoor operating conditions. For the comparison, we first validate an optoelectroni

Externí odkaz: http://arxiv.org/abs/2310.06914

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Akademický článek

Examination of duodenal and colonic microbiome changes in mouse models of acute and chronic pancreatitis

Autor: Rabea Lange, Juliane Glaubitz, Fabian Frost, Andreas Geisz, Ali A. Aghdassi, F. Ulrich Weiss, Matthias Sendler

Publikováno v: Scientific Reports, Vol 14, Iss 1, Pp 1-10 (2024)

Abstract The exocrine pancreas is the main source of digestive enzymes which are released from secretory vesicles of acinar cells into the small intestine. Enzymes, including amylases, proteases and lipases, degrade the ingested food and thus determi

Externí odkaz: https://doaj.org/article/4e784e7b78f54ba38d5075d7823f12f8

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On the Stepwise Nature of Self-Supervised Learning

Autor: Simon, James B., Knutins, Maksis, Ziyin, Liu, Geisz, Daniel, Fetterman, Abraham J., Albrecht, Joshua

We present a simple picture of the training process of joint embedding self-supervised learning methods. We find that these methods learn their high-dimensional embeddings one dimension at a time in a sequence of discrete, well-separated steps. We ar

Externí odkaz: http://arxiv.org/abs/2303.15438

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Triple-junction solar cells with 39.5% terrestrial and 34.2% space efficiency enabled by thick quantum well superlattices

Autor: France, Ryan M., Geisz, John F., Song, Tao, Olavarria, Waldo, Young, Michelle, Kibbler, Alan, Steiner, Myles A.

Multijunction solar cell design is guided by both the theoretical optimal bandgap combination as well as the realistic limitations to materials with these bandgaps. For instance, triple-junction III-V multijunction solar cells commonly use GaAs as a

Externí odkaz: http://arxiv.org/abs/2203.15593

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Efficient light-trapping in ultrathin GaAs solar cells using quasi-random photonic crystals

Autor: Buencuerpo, Jeronimo, Saenz, Theresa E., Steger, Mark, Young, Michelle, Warren, Emily L., Geisz, John F., Steiner, Myles A., Tamboli, Adele C.

Ultrathin solar cells reduce material usage and allow the use of lower-quality materials thanks to their one order of magnitude smaller thickness than their conventional counterparts. However, efficient photonic light-trapping is required to harvest

Externí odkaz: http://arxiv.org/abs/2202.03106

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