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Electrolysis03:00

Electrolysis

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Key Factors Affecting the Performance of Sb2S3-sensitized Solar Cells During an Sb2S3 Deposition via SbCl3-thiourea Complex Solution-processing
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High-Efficiency Sb2Se3 Solar Cells Modified by Potassium Hydroxide.

Huafei Guo1, Cong Zhao2, Yelei Xing2

  • 1School of Microelectronics and Control Engineering, Jiangsu Collaborative Innovation Center for Photovoltaic Science and Engineering, Jiangsu Province Cultivation base for State Key Laboratory of Photovoltaic Science and Technology, Changzhou University, Changzhou 213164, China.

The Journal of Physical Chemistry Letters
|December 22, 2021
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Summary

Potassium hydroxide (KOH) treatment enhances antimony selenide (Sb2Se3) solar cells by improving doping density and back contacts. This method boosts Sb2Se3 solar cell efficiency to 7.16%.

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Semiconductor Physics

Background:

  • Antimony selenide (Sb2Se3) is a promising material for solar cells due to its non-toxicity and abundance.
  • Current Sb2Se3 solar cell efficiency is limited by low carrier concentration and interfacial recombination.

Purpose of the Study:

  • To investigate the use of potassium hydroxide (KOH) solution as an etchant to improve Sb2Se3 solar cell performance.
  • To understand the mechanisms by which KOH treatment affects Sb2Se3 films and interfaces.

Main Methods:

  • Treatment of Sb2Se3 films with KOH solution.
  • Characterization of etched Sb2Se3 films and solar cell devices.
  • Analysis of doping density and interfacial properties.

Main Results:

  • KOH solution etches the Sb2Se3 surface and diffuses into the film.
  • Unexpectedly, KOH treatment increases doping density and improves the back contact by forming an Sb2O3 layer.
  • The optimized Sb2Se3 solar cells achieved a power conversion efficiency of 7.16% with an open-circuit voltage of 0.407 V.

Conclusions:

  • KOH treatment is an effective method for enhancing Sb2Se3 solar cell efficiency.
  • The improved performance is attributed to increased doping and better back contacts.
  • This approach offers a pathway for developing high-efficiency Sb2Se3-based photovoltaic devices.