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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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SC1 is lead oxide structured and crystallizes in the tetragonal P4/nmm space group. The structure is two-dimensional and consists of one SC1 sheet oriented in the (0, 0, 1) direction. C2+ is bonded to four equivalent S2- atoms to form a mixture of distorted edge and corner-sharing CS4 trigonal pyramids. All C–S bond lengths are 1.90 Å. S2- is bonded in a distorted see-saw-like geometry to four equivalent C2+ atoms.
This payload overview presentation will be presented at the Payload Operations Integration Working Group (POIWG) on April 26, 2018. It provides a high-level overview of Cell Science-03 operations.
This payload overview presentation will be presented at the Payload Operations Integration Working Group (POIWG) on April 26, 2018. It provides a high-level overview of Cell Science-02 operations.
This payload overview presentation will be presented at the Payload Operations Integration Working Group (POIWG) on October 25th, 2018. It provides a high-level overview of Cell Science-03 operations.
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Cesium-based quasi-2D halide perovskites (HPs) offer promising functionalities and low-temperature manufacturability, suited to stable tandem photovoltaics. However, the chemical interplays between the molecular spacers and the inorganic building blocks during crystallization cause substantial phase complexities in the resulting matrices. To successfully optimize and implement the quasi-2D HP functionalities, a systematic understanding of spacer chemistry, along with the seamless navigation of the inherently discrete molecular space, is necessary. Herein, by utilizing high-throughput automated experimentation, the phase complexities in the molecular space of quasi-2D HPs are explored, thus identifying the chemical roles of the spacer cations on the synthesis and functionalities of the complex materials. Furthermore, a novel active machine learning algorithm leveraging a two-stage decision-making process, called gated Gaussian process Bayesian optimization is introduced, to navigate the discrete ternary chemical space defined with two distinctive spacer molecules. Through simultaneous optimization of photoluminescence intensity and stability that “tailors” the chemistry in the molecular space, a ternary-compositional quasi-2D HP film realizing excellent optoelectronic functionalities is demonstrated. Finally, this work not only provides a pathway for the rational and bespoke design of complex HP materials but also sets the stage for accelerated materials discovery in other multifunctional systems.
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