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Related Concept Videos

Band Theory02:35

Band Theory

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
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Electronic Structure of Atoms02:28

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An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
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Radicals: Electronic Structure and Geometry01:07

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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
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Gap Junctions01:37

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Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
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Gap Junctions01:27

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The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
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Energy Bands in Solids01:01

Energy Bands in Solids

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Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
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Multi Band Gap Electronic Structure in CH3NH3PbI3.

Khuong P Ong1, Shunnian Wu2, Tien Hoa Nguyen3

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Organo-lead halide perovskite solar cells utilize soft semiconductors for efficient charge collection. Molecular dynamics reveal local polar structures, crucial for understanding their photovoltaic properties and enhanced performance.

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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Renewable Energy

Background:

  • Organo-lead halide perovskites are revolutionary solar photovoltaic materials.
  • They exhibit excellent charge collection properties despite complex structures.
  • The dynamics of methylammonium (CH3NH3)+ ions and their interplay with electronic properties in (CH3NH3)PbI3 are not fully understood.

Purpose of the Study:

  • To investigate the local structural dynamics and electronic properties of organo-lead halide perovskites.
  • To elucidate the role of methylammonium ion rotation in determining the material's behavior.
  • To understand the origins of enhanced charge collection and light absorption.

Main Methods:

  • Ab-initio calculations were employed to simulate material behavior.
  • Analysis focused on molecular dynamics, structural fluctuations, and electronic band structure.
  • Calculations explored the temperature-dependent behavior and local structural symmetries.

Main Results:

  • At room temperature, methylammonium molecule rotation leads to locally cubic and tetragonal-like PbI3 frameworks of lower symmetry.
  • These local structures are polar, exhibiting significant polarization (~10 μC/cm2) due to organic dipoles.
  • Band gap is highly dependent on local structure, with transitions analogous to ferroelectric shifts.

Conclusions:

  • Local polar structures arising from methylammonium dynamics are key to perovskite solar cell performance.
  • Strong screening of charged defects, despite electron-phonon coupling, enhances charge carrier mobility.
  • These findings provide insights into enhanced light absorption and charge collection in organo-lead halide perovskites.