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Diffusion01:12

Diffusion

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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The Phosphorus Cycle01:21

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Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
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Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
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Black silicon significantly enhances phosphorus diffusion gettering.

Toni P Pasanen1, Hannu S Laine2, Ville Vähänissi2

  • 1Aalto University, Department of Electronics and Nanoengineering, Espoo, 02150, Finland. toni.pasanen@aalto.fi.

Scientific Reports
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Summary
This summary is machine-generated.

Black silicon (b-Si) enhances metal impurity removal, significantly boosting silicon wafer quality. This novel gettering technique improves minority carrier lifetime, enabling higher efficiency in photovoltaic devices.

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Area of Science:

  • Materials Science
  • Semiconductor Physics
  • Surface Science

Background:

  • Black silicon (b-Si) is increasingly used in technology, with its high surface area often seen as a limitation.
  • Metal impurities like iron degrade silicon performance, particularly in electronic and photovoltaic applications.

Purpose of the Study:

  • To investigate the potential of black silicon's increased surface area for gettering metal impurities.
  • To demonstrate the effectiveness of b-Si in reducing iron concentration and improving minority carrier lifetime in silicon wafers.

Main Methods:

  • Experimental contamination of silicon wafers with iron.
  • Application of black silicon gettering combined with phosphorus diffusion using POCl3.
  • Low-temperature annealing and device characterization to measure impurity concentration and minority carrier lifetime.
  • Process simulations to understand the gettering mechanism.

Main Results:

  • Interstitial iron concentration reduced from 1.7 × 10^13 cm^-3 to below 10^10 cm^-3.
  • Minority carrier lifetime increased from < 2 μs to > 1.5 ms.
  • Simulations confirmed heavy phosphorus doping of b-Si needles, promoting iron segregation.

Conclusions:

  • The increased surface area of b-Si can be advantageously used for efficient gettering of metal impurities.
  • Segregation into the phosphorus-doped layer is the primary gettering mechanism.
  • This method offers potential for using lower-quality silicon in high-efficiency photovoltaic devices.