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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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Updated: Sep 23, 2025

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation
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Interface engineering through electron transport layer modification for high efficiency organic solar cells.

Kunal Borse1,2, Ramakant Sharma1, Dipti Gupta1

  • 1Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay Powai Mumbai-400076 India diptig@iitb.ac.in aswani.yella@iitb.ac.in.

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|May 11, 2022
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Summary
This summary is machine-generated.

Electron transport layers using zinc oxide (ZnO) with barium hydroxide [Ba(OH)2] improved organic solar cell performance. Bilayer and nanocomposite ETLs showed superior device efficiency compared to ZnO alone.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Organic solar cells (OSCs) offer a promising alternative to silicon-based photovoltaics due to their flexibility and low-cost fabrication.
  • The performance of OSCs is highly dependent on the charge transport layers, particularly the electron transport layer (ETL).
  • Zinc oxide (ZnO) is a commonly used ETL material, but its performance can be further optimized.

Purpose of the Study:

  • To compare the device performance of poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2,6-diyl)] (PTB7-Th):phenyl-C71-butyric acid methyl ester (PCBM) organic solar cells (OSCs) using different electron transport layers (ETLs).
  • To investigate the impact of ZnO, ZnO/Ba(OH)2 bilayer, and ZnO:Ba(OH)2 nanocomposite ETLs on inverted OSC performance.
  • To elucidate the underlying mechanisms responsible for performance enhancements.

Main Methods:

  • Fabrication of inverted OSCs with PTB7-Th:PCBM active layers.
  • Implementation of ZnO, ZnO/Ba(OH)2 bilayer, and ZnO:Ba(OH)2 nanocomposite as ETLs.
  • Characterization using morphological studies, contact angle measurements, X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), and photo-electrochemical impedance spectroscopy (EIS).

Main Results:

  • Devices with ZnO/Ba(OH)2 and ZnO:Ba(OH)2 nanocomposite ETLs exhibited superior performance compared to devices with ZnO ETL alone.
  • Morphological studies indicated that ZnO/Ba(OH)2 and ZnO:Ba(OH)2 films are smoother and more hydrophobic than ZnO films.
  • XPS and UPS measurements revealed a lower work function for the ZnO/Ba(OH)2 and ZnO:Ba(OH)2 nanocomposite films.

Conclusions:

  • The integration of barium hydroxide (Ba(OH)2) with zinc oxide (ZnO) as an electron transport layer significantly enhances the performance of PTB7-Th:PCBM organic solar cells.
  • The improved device efficiency is attributed to the reduced work function, increased hydrophobicity, and smoother surface morphology of the modified ETLs, which suppress charge recombination and enhance charge collection.
  • Bilayer and nanocomposite ETLs represent a viable strategy for optimizing electron transport and boosting the overall efficiency of organic solar cells.