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Related Concept Videos

P-N junction01:11

P-N junction

760
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
760
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

584
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
584
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

372
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
372
Schottky Barrier Diode01:27

Schottky Barrier Diode

564
Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
564
Types of Semiconductors01:20

Types of Semiconductors

1.0K
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
1.0K
Biasing of P-N Junction01:16

Biasing of P-N Junction

1.1K
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
1.1K

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Updated: Oct 20, 2025

Developing High Performance GaP/Si Heterojunction Solar Cells
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Developing High Performance GaP/Si Heterojunction Solar Cells

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Silicon Heterojunction Microcells.

Maggie M Potter1, Megan E Phelan2, Pradeep Balaji3

  • 1Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.

ACS Applied Materials & Interfaces
|September 14, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed silicon heterojunction microcells for efficient solar energy conversion. These microcells achieve record open-circuit voltage, paving the way for high-efficiency microscale photovoltaics.

Keywords:
edge passivationmicrocellmicrofabricationphotovoltaicsilicon heterojunction

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Renewable Energy

Background:

  • Silicon heterojunction technology offers high photovoltaic efficiency.
  • Miniaturization of solar cells presents challenges in surface passivation and carrier recombination.
  • Microscale form factors are desirable for specialized photovoltaic applications.

Purpose of the Study:

  • To design, fabricate, and characterize novel silicon heterojunction microcells.
  • To investigate methods for effective sidewall passivation in microscale solar cells.
  • To optimize microcell performance and explore pathways to high efficiencies.

Main Methods:

  • Fabrication of silicon heterojunction microcells using dry etching and laser cutting.
  • Implementation of native oxide-based and deposited edge passivation techniques.
  • Characterization of microcell performance, including open-circuit voltage (Voc) and its dependence on cell dimensions.

Main Results:

  • Achieved the highest reported silicon microcell open-circuit voltage (Voc) of 588 mV for a 400 μm × 400 μm × 80 μm device.
  • Demonstrated Voc improvements up to 55 mV through deposited edge passivation.
  • Identified key synthesis parameters influencing edge passivation quality and microcell performance.

Conclusions:

  • Silicon heterojunction microcells can leverage bulk wafer efficiency in a microscale format.
  • Effective edge passivation is critical for mitigating recombination and enhancing microcell performance.
  • A clear route exists to achieve microcell efficiencies exceeding 15% for these devices.