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Related Concept Videos

P-N junction01:11

P-N junction

507
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...
507

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Related Experiment Video

Updated: Jun 20, 2025

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
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In Situ Buried Interface Engineering towards Printable Pb-Sn Perovskite Solar Cells.

Johnpaul K Pious1, Huagui Lai1, Juntao Hu2

  • 1Laboratory for Thin Films and Photovoltaics, Empa - Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, Dübendorf 8600, Switzerland.

ACS Applied Materials & Interfaces
|July 20, 2024
PubMed
Summary
This summary is machine-generated.

Researchers improved perovskite solar cells (PSCs) by modifying the hole-transport layer (HTL) with 2-fluoro benzylammonium iodide (FBI). This reduces recombination, boosting efficiency and voltage in lead-tin PSCs.

Keywords:
2-fluoro benzylammonium iodide additiveblade-coatingburied interfacelow bandgap Pb−Sn perovskitesperovskite solar cell upscaling

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • High-efficiency lead-tin narrow-bandgap perovskite solar cells (PSCs) commonly use PEDOT:PSS as a hole-transport layer (HTL).
  • The shallow work function of PEDOT:PSS leads to significant minority carrier recombination at the perovskite/HTL interface, limiting device performance.

Purpose of the Study:

  • To address the limitations of PEDOT:PSS in PSCs by suppressing nonradiative recombination at the perovskite/HTL interface.
  • To enhance the efficiency and open-circuit voltage (V_OC) of lead-tin PSCs through in situ interface engineering.

Main Methods:

  • An in situ interface engineering strategy was employed using 2-fluoro benzylammonium iodide (FBI) to modify the PEDOT:PSS HTL.
  • The work function (W_F) of PEDOT:PSS was measured before and after FBI modification.
  • The performance of modified PSCs was evaluated, including power conversion efficiency and V_OC.

Main Results:

  • FBI modification increased the work function of PEDOT:PSS by 0.1 eV.
  • Lead-tin PSCs with FBI modification achieved a power conversion efficiency of 20.5% and a V_OC of 0.843 V.
  • The strategy was successfully applied to blade-coated PSCs, yielding 18.3% efficiency and a V_OC of 0.845 V.

Conclusions:

  • In situ interface modification with FBI effectively suppresses nonradiative recombination at the perovskite/HTL interface.
  • FBI is a promising strategy for enhancing the performance of lead-tin PSCs, particularly for scalable fabrication methods like blade coating.