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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
P-N junction01:11

P-N junction

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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Related Experiment Video

Updated: Jun 6, 2026

Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization
07:32

Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization

Published on: January 29, 2017

Study of buffer layer thickness on bulk heterojunction solar cell.

Seunguk Noh1, C K Suman, Donggu Lee

  • 1School of Electrical Engineering and Computer Science, Inter-University Semiconductor Research Center, Seoul National University, Seoul 151-742, Republic of Korea.

Journal of Nanoscience and Nanotechnology
|December 9, 2010
PubMed
Summary

Optimizing the molybdenum-oxide buffer layer thickness in organic solar cells is key to performance. A thickness between 5-10 nm maximizes efficiency, while thicker layers reduce performance.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Organic solar cells (OSCs) offer a promising alternative to conventional photovoltaics.
  • Performance of OSCs is highly dependent on interfacial engineering and material properties.
  • Molybdenum-oxide (MoO3) is commonly used as a hole-transporting buffer layer in OSCs.

Purpose of the Study:

  • To investigate the impact of molybdenum-oxide (MoO3) buffer layer thickness on the performance of poly(3-hexylthiophene):[6,6]-phenyl-C61 butyric acid methyl ester (P3HT:PCBM) organic solar cells.
  • To determine the optimal MoO3 thickness for enhanced device efficiency and carrier collection.
  • To elucidate the role of the buffer layer thickness in device operation through electrical characterization.

Main Methods:

  • Fabrication of organic solar cells using P3HT:PCBM active layers with varying MoO3 buffer layer thicknesses (1 nm to 30 nm).
  • Performance characterization under simulated AM1.5G solar illumination (100 mW/cm2).
  • Measurement of photocurrent-voltage characteristics and impedance spectroscopy under dark and illuminated conditions.

Main Results:

  • An optimal MoO3 buffer layer thickness was identified in the range of approximately 5-10 nm, yielding a device efficiency of approximately 3.7%.
  • Increasing MoO3 thickness beyond 5 nm led to a gradual decrease in short-circuit current and shunt resistance.
  • Device electrical behavior was modeled using a series combination of three parallel RC circuits (representing active layer, buffer layer, and interface) and contact resistance (Rs ≈ 60 Ω).

Conclusions:

  • The thickness of the MoO3 buffer layer critically influences the performance of P3HT:PCBM organic solar cells.
  • Proper tuning of the MoO3 buffer layer thickness is essential for efficient charge carrier collection and maximizing device efficiency.
  • Understanding the interfacial effects and electrical modeling provides insights for further optimization of organic photovoltaic devices.