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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...
559

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Surface Modulation via Conjugated Bithiophene Ammonium Salt for Efficient Inverted Perovskite Solar Cells.

Xin Zhang1,2,3,4,5, Stijn Eurelings6, Andrea Bracesco6

  • 1Center for Micro Nano Systems, School of Information Science and Technology (SIST), Fudan University, Handan 220, Shanghai 200433, China.

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|September 27, 2023
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Summary

Trace amounts of bithiophene propylammonium iodide (bi-TPAI) passivate surface defects in perovskite solar cells (PSCs). This treatment enhances power conversion efficiency (PCE) and operational stability by improving charge extraction and reducing burn-in effects.

Keywords:
burn-in effectoperational stabilityperovskite solar cellssputtered nickel oxidesurface modulation

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Area of Science:

  • Materials Science
  • Renewable Energy

Background:

  • Metal halide perovskite absorbers suffer from surface defects, limiting power conversion efficiencies (PCEs) and operational stability in perovskite solar cells (PSCs).
  • Effective strategies are needed to passivate these surface defects and enhance device performance.

Purpose of the Study:

  • To investigate the effect of trace amounts of bithiophene propylammonium iodide (bi-TPAI) on the surface properties of gas-quenched perovskite films.
  • To improve the power conversion efficiency (PCE) and operational stability of perovskite solar cells (PSCs) through surface defect passivation.

Main Methods:

  • Gas-quenched perovskite films were treated with trace amounts of bithiophene propylammonium iodide (bi-TPAI).
  • The morphology, defect passivation, and charge carrier extraction of the treated perovskite films were analyzed.
  • Inverted perovskite solar cells (PSCs) based on sputtered NiO were fabricated and characterized.

Main Results:

  • The bi-TPAI surface treatment had a negligible impact on perovskite morphology.
  • bi-TPAI induced defect passivation and facilitated charge carrier extraction, increasing open-circuit voltage (Voc) and fill factor.
  • The power conversion efficiency (PCE) of the PSCs increased from 20.0% to 22.0%.

Conclusions:

  • bi-TPAI is an effective surface modulator for perovskite films, enhancing device performance.
  • The treatment significantly improves the operational stability of PSCs by alleviating the burn-in process.
  • This approach offers a promising route for developing highly efficient and stable perovskite solar cells.