"Science" (Published 20220729) One -week thesis Guide

Compilation | Li Yan

Science, 29 Jul 2022, VOL 377, Issue 6605

"Science" July 29, 2022, Vol. 377, 6605

Material Science Material Science

Inactive (PBI2) 2RBCL Stabilizes Perovskite Films for Efficient Solar Cells

Non -active (PBI2) 2RBCL stabilized oscope ore film high -efficiency solar cell

Author: yang zhao, Fei Mazihan Qu, Shiqi Yu, Tao Shen, hui-xiong deng et al.

Link:

https://www.science.org/doi/10.1126/sclence.abp8873

Summary:

In the halide perovskite solar cell, the formation of secondary excessive iodine lead (PBI2) has a certain positive impact on power conversion efficiency (PCE) Great lag effect.

Through RBCL doping, we transform PBI2 into non -active (PBI2) 2RBCL compounds to effectively stabilize the perovskite phase. Based on this method, we obtained FAPBI3 perovskite solar cells, and its authentication power conversion efficiency PCE was 25.6%. After 1,000 hours of storage, the device retains 96%of the original power conversion efficiency PCE value, and after 500 hours of thermal stability test at 85 ° C, 80%of the original power conversion efficiency PCE value was retained.

Abstract:

In halide perovskite solar cells the formation of secondary-phase excess lead iodide (PbI2) has some positive effects on power conversion efficiency (PCE) but can be detrimental to device stability and lead to large hysteresis effects in voltage sweeps. We converted PbI2 into an inactive (PbI2)2RbCl compound by RbCl doping, which effectively stabilizes the perovskite phase. We obtained a certified PCE of 25.6% for FAPbI3 (FA, formamidinium) perovskite solar cells on the basis of this strategy. Devices retained 96% of their original PCE Values ​​after 1000 Hours of Sheelf Storage and 80% After 500 Hour STABILITY TESTING AT 85 ° C.

ION-MODULED RADICAL DOPING of Spiro-More Efficient and Stable Perovskite Solar Cells

SPIRO-Metad ion modulation free radical mixture mimic lyte ore battery

Author: tiankai zhang, feng wang, hak-beom kim, in-woo choin et al.

Link:

https://www.science.org/doi/10.1126/sclence.abo2757

Summary:

We have developed a new Spiro-Altad doping method. By using stable organic free radicals as dopiane agents, ionic salts are used as doped modulators to avoid the problem of oxidation.

We achieved energy conversion efficiency greater than 25%and greatly improved the stability of equipment under harsh conditions. The cavity polarization provided by Liberty can instantly increase the conductivity and function (WF), while ionic salts further adjust the WF by affecting the energy of the acupuncture polarization.

This organic semiconductor doping method can decompose the conductivity and function WF adjustable, which can stimulate further optimization of other optoelectric components.

Abstract:

We developed a new doping strategy for spiro-OMeTAD that avoids post-oxidation by using stable organic radicals as the dopant and ionic salts as the doping modulator (referred to as ion-modulated radical doping). We achieved PCEs of &25% and much- improved device stability under harsh conditions. The radicals provide hole polarons that instantly increase the conductivity and work function (WF), and ionic salts further modulate the WF by affecting the energetics of the hole polarons. This organic semiconductor doping strategy, which decouples conductivity and WF Tunability, Could INSPIRE FURTHER OPTIMATION in Other OptoElectronic Devices.dna-GUIDED Lattice Remodeling of Carbon Nanotubes

DNA guided carbon nanotimal tube crystal reconstruction

Author: zhiwei Lin, Leticia C. Beltrán, Zeus A. de Los Santos, yinong li et al.

Link:

https://www.science.org/doi/10.1126/sclence.abo4628

Summary:

Here, we report a solution to a DNA sequence -specific cross -linking chemistry using sorcerine base. Through DNA filtering, we determined a sequence C3GC7GC3, and the (8,3) response to the reflection of the reflection generated the minimum disorderly induction of the Raman mode intensity and the optical light emitting STOKES displacement, indicating the formation of the orderly arrangement of the lattice defect.

Frozen electron microscope shows C3GC7GC3- (8, 3) with an orderly DNA spiral structure, and its snail distance is 6.5 å. Analysis of the reaction mechanism shows that this threading is separated by a series of G-modified carbon-carbon bonds along the spiral line according to a fixed distance. Our discovery may be used for the reconstruction of nano -tube lattice to obtain new electronic characteristics.

Abstract:

We report a solution using DNA-directed, guanine (G)-specific cross-linking chemistry. Through DNA screening we identify a sequence, C3GC7GC3, whose reaction with an (8,3) enantiomer yields minimum disorder-induced Raman mode intensities and photoluminescence Stokes shift, suggesting ordered defect array formation. Single-particle cryo–electron microscopy shows that the C3GC7GC3 functionalized (8,3) has an ordered helical structure with a 6.5 angstroms periodicity. Reaction mechanism analysis suggests that the helical periodicity arises from an array of G-modified carbon-carbon bonds separated by a fixed distance along an armchair helical line. Our findings may be used to remodel nanotube lattices for novel electronic properties.Nanosecond protonic programmable resistors for analog deep learning

Non -second -second proton programming resistance used to simulate deep learning

Author: Murat One, nicolas emond, baoming Wang et al.

Link:

https://www.science.org/doi/10.1126/science.abp8064

Summary:

In this work, we have generated a compatible nano -level proton programming resistor, which has very ideal characteristics under the extreme electric field.

This operating mechanism allows proton to be controlled and inserted in a nanoseconds at room temperature at room temperature. This device has symmetrical, linear and reversible modulation characteristics, and multiple conductivity states cover a 20 × dynamic range.

Therefore, the energy performance of the full -solid artificial synapses can exceed their biological correspondence.

Abstract:

In this work, we generated silicon-compatible nanoscale protonic programmable resistors with highly desirable characteristics under extreme electric fields. This operation regime enabled controlled shuttling and intercalation of protons in nanoseconds at room temperature in an energy-efficient manner. The devices showed symmetric, linear , and reversible modulation characteristics with many conductance states covering a 20× dynamic range. Thus, the space-time-energy performance of the all–solid-state artificial synapses can greatly exceed that of their biological counterparts.

Earth Science Earth Science

Constraints on the Adjustment of Tidal Marshes to accept sea level rise swamp adjustment factors to accelerate rising in sea level

Author: neil Saintilan, Katya E. Kovalenko, Glenn GunttenSpergen et al.

Link:

https://www.science.org/doi/10.1126/sclence.abo7872

Summary:

The vulnerability of the precious tide swamp ecosystem is still doubtful in the face of the rise of related sea level. The previous evaluation of the recovery of sea level rising showed that according to the different geological data of contemporary or new generations, the swamp can adjust the recovery power of sea level rising through the increase of sediments and the increase in altitude.

By analyzing contemporary global data, we found that the increase in swamp sediments and the rise of sea levels are equal, which seems to confirm the recovery power of the swamp mentioned earlier. However, the amount of foundation sinks is not linearly increased with the volume of accumulation. Therefore, the increase in the height of the swamp is limited by the rise of the sea level, and the decline in the appearance is consistent with the vulnerability of the tidal swamp vulnerability.

Abstract:

Much uncertainty exists about the vulnerability of valuable tidal marsh ecosystems to relative sea level rise. Previous assessments of resilience to sea level rise, to which marshes can adjust by sediment accretion and elevation gain, revealed contrasting results, depending on contemporary or Holocene geological data. By analyzing globally distributed contemporary data, we found that marsh sediment accretion increases in parity with sea level rise, seemingly confirming previously claimed marsh resilience. However, subsidence of the substrate shows a nonlinear increase with accretion. As a result, marsh elevation gain is constrained In related to sea level rise, and deficits emerge that are consistent with holofene observations of tidal marsh vulnerability.

Biology biology

POLLINATORS of the Sea: A Discovery of Animal-Mediated Fertilization in Seaweed

Ocean pollination person: Animal in the seaweed in the sea of ​​animal media is discovery

Author: e. lavaut, m.-l. guillemin, s. color. Faure et al.

Link:

https://www.science.org/doi/10.1126/sclence.abo6661

Summary:

For a long time, the view that there is no animal pollination in the ocean has been opposed in the recent research of seagrass, which has promoted other research on marine animals. This is especially related to the algae. In the red algae, the females are not liberated, and the male supporting is no whip.

Utilizing the experiments of foot animals Idotea Balthica and red algae Gracilaria Gracilis, we proved that biological interactions have significantly improved the fertilizedness of algae through the sperm in animal transportation. This discovery shows that the fertilization of animals mediated may evolve independently in land and marine environment and increase the possibility of appearing in the ocean before plants ashore.

Abstract:

The long-held belief that animal-mediated pollination is absent in the sea has recently been contradicted in seagrasses, motivating investigations of other marine phyla. This is particularly relevant in red algae, in which female gametes are not liberated and male gametes are not flagellated . Using experiments with the isopod Idotea balthica and the red alga Gracilaria gracilis, we demonstrate that biotic interactions dramatically increase the fertilization success of the alga through animal transport of spermatia on their body. This discovery suggests that animal-mediated fertilization could have evolved independently in Terrestric and Marine Environments and RAISES The PossiBility of ITS Emergence in the Sea Before Plants Moved Ashore.

Capture | Guo Gang

/> />

Cooperation: [email protected]

Submission: [email protected]

Like this article? Praise + watch support!

- END -