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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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All sourcesNASA NTRSDOE OSTI
DOE OSTI2014

Guided Crystallization of P3HT in Ternary Blend Solar Cell Based on P3HT:PCPDTBT:PCBM

To mimic the performance of the tandem solar cells, ternary blend solar cells with a single active layer of P3HT:PCPDTBT:PC61BM were cast from chlorobenzene and thermally annealed. By varying blending ratio, thermal annealing time and P3HT molecular weight, the device performance was enhanced relative to the binary references.For further understanding, the morphology of the active layer was studied using hard and soft X-ray scattering methods in concert with bright field and energy resolved transmission electron microscopies. We found that the phase separation of the amorphous PCPDTBT and P3HT guided the formation of P3HT fibrils, resulting in a unique multi-length-scale morphology. This morphology consisted of bundles of well-defined P3HT fibrils, forming a network, imbedded in an amorphous mixture of the PCBM, PCPDTBT and P3HT. The two polymers acted independently in their specific photoactive ranges, and the sensitization of PCPDTBT benefited the cascade charge transfer. In addition, this multi-length-scale morphology was linked to the improved device performance of P3HT:PCPDTBT:PC 61 BM and the photophysics of the active layer.

14 SOLAR ENERGY↗
DOE OSTI2018

Crystal-on-crystal chips for in situ serial diffraction at room temperature

Recent developments in serial crystallography have been driven by two scientific goals – first, static structure determination from nano or microcrystals that are difficult for cryocrystallography, and second, direct observations of transient structural species in biochemical reactions at near atomic resolution.

Ren, Zhong↗