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Related Concept Videos

P-N junction01:11

P-N junction

1.6K
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...
1.6K

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Related Experiment Video

Updated: Mar 26, 2026

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Novel Surface Passivation Technique for Low-Temperature Solution-Processed Perovskite PV Cells.

Neeti Tripathi1, Yasuhiro Shirai1,2, Masatoshi Yanagida1,2

  • 1Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS) , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.

ACS Applied Materials & Interfaces
|January 30, 2016
PubMed
Summary

Low-temperature perovskite solar cells achieve higher efficiency and stability with the addition of poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] (PFN-P1). This surfactant promotes uniform crystallization, improving performance and reproducibility for mass production.

Keywords:
PFNlow temperatureperovskitesolar cellsolution processstability

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Low-temperature solution-processed perovskite solar cells offer fabrication ease and mass production potential on flexible substrates.
  • Unfavorable surface properties of planar substrates hinder perovskite crystal growth and charge extraction, limiting device performance.
  • Achieving high performance, reproducibility, and stability in these cells remains a key challenge.

Purpose of the Study:

  • To improve the performance, reproducibility, and stability of planar heterojunction perovskite solar cells.
  • To investigate the effect of poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] (PFN-P1) as a surfactant in perovskite films.
  • To demonstrate a simple and effective method for enhancing perovskite solar cell characteristics.

Main Methods:

  • Incorporation of the amine-polymer PFN-P1 into a standard spin-coating process for perovskite film fabrication.
  • Utilizing PFN-P1 as a surfactant to promote uniform perovskite crystallization and control grain size.
  • Fabrication and characterization of
  • p-i-n
  • planar heterojunction perovskite solar cells with and without PFN-P1.

Main Results:

  • PFN-P1 addition resulted in perovskite films with uniform grain size distribution and enhanced open-circuit voltage.
  • Devices incorporating PFN-P1 achieved a maximum power conversion efficiency of 13.2% with a low standard deviation (0.40) across 60 cells.
  • Over 90% of initial efficiency was retained after 6 months of testing, and devices showed enhanced stability under continuous operation for 150 hours.

Conclusions:

  • The addition of PFN-P1 is a simple and effective strategy to improve the performance, reproducibility, and stability of low-temperature solution-processed perovskite solar cells.
  • PFN-P1 acts as a surfactant, facilitating uniform crystallization and better interfacial charge extraction.
  • This approach represents significant progress towards the commercial viability of flexible perovskite solar cells.