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Related Concept Videos

P-N junction01:11

P-N junction

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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...
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Capacitors and Capacitance01:18

Capacitors and Capacitance

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A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
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Energy Stored in a Capacitor01:12

Energy Stored in a Capacitor

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When an archer pulls the string in a bow, he saves the work done in the form of elastic potential energy. When he releases the string, the potential energy is released as kinetic energy of the arrow. A capacitor works on the same principle in which the work done is saved as electric potential energy. The potential energy (UC) could be calculated by measuring the work done (W) to charge the capacitor.
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Energy Stored in Capacitors01:10

Energy Stored in Capacitors

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A parallel plate capacitor, when connected to a battery, develops a potential difference across its plates. This potential difference is key to the operation of the capacitor, as it determines how much electrical energy the capacitor can store.
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Energy Stored in a Capacitor: Problem Solving01:26

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In 1749, Benjamin Franklin coined the word battery for a series of capacitors connected to store energy. Capacitors store electric potential energy that can be released over a short time. This property means capacitors have a wide range of applications.
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RC Circuits: Charging A Capacitor

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A circuit containing resistance and capacitance is called an RC circuit. A capacitor is an electrical component that stores electric charge by storing energy in an electric field. Consider a simple RC circuit having a DC (direct current) voltage source ε, a resistor R, a capacitor C, and a two-way position switch. In the circuit, the capacitor can be charged or discharged depending on the position of the switch.
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A Capacitor-type Faradaic Junction for Direct Solar Energy Conversion and Storage.

Pin Wang1, Xiangtian Chen1, Gengzhi Sun2

  • 1Eco-materials and Renewable Energy Research Center (ERERC), Jiangsu Key Laboratory for Nano Technology, National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, China.

Angewandte Chemie (International Ed. in English)
|October 6, 2020
PubMed
Summary

This study introduces a novel two-electrode solar rechargeable device that operates without external bias, achieving the highest dark output power. The device utilizes a unique Si/WO3 junction to overcome interface energy barriers, enabling efficient solar energy conversion and storage.

Keywords:
Faradaic layeradjustable barrier heightinterface charge transferphotoelectrochemistrysolar rechargeable device

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Two-electrode solar rechargeable devices are promising for energy conversion and storage.
  • Interface energy barriers limit their voltage output and dark discharge capabilities, necessitating external biases.
  • Existing devices have limited practical applications due to these limitations.

Purpose of the Study:

  • To develop a two-electrode solar rechargeable device that operates without external bias.
  • To overcome the interface energy barrier issue in solar rechargeable devices.
  • To achieve high dark output power for practical applications.

Main Methods:

  • Fabrication of a novel two-electrode device: Si/WO3/H2SO4(aq)/C.
  • Investigation of photoinduced adjustable interface barrier height during charge transfer.
  • Characterization of the device's performance, including dark discharge and output power.

Main Results:

  • The developed Si/WO3/H2SO4(aq)/C device operates efficiently without external bias.
  • The device exhibits the highest dark output power reported for two-electrode solar rechargeable devices.
  • The Si/WO3 junction demonstrates photoinduced adjustable interface barrier height, overcoming energy loss.

Conclusions:

  • The novel Si/WO3 junction acts as a capacitor-type Faradaic junction, enabling bias-free dark discharge.
  • This breakthrough significantly enhances the practical applicability of two-electrode solar rechargeable devices.
  • The findings pave the way for more efficient solar energy conversion and storage solutions.