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P-N junction

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: Dec 31, 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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Functionalized rGO Interlayers Improve the Fill Factor and Current Density in PbS QDs-Based Solar Cells.

Anton A Babaev¹, Peter S Parfenov¹, Dmitry A Onishchuk¹

¹Center of Information optical technology, ITMO University, 197101 St. Petersburg, Russia.

Materials (Basel, Switzerland)

|January 1, 2020

Summary

Researchers enhanced solar cell efficiency by incorporating functionalized reduced graphene oxide (f-rGO) into quantum dot (QD) layers. This improves charge transport and reduces defects, leading to better device performance.

Keywords:

impedance spectroscopy quantum dots reduced graphene oxide solar cells

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Last Updated: Dec 31, 2025

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Area of Science:

Materials Science
Nanotechnology
Renewable Energy

Background:

Graphene-quantum dot (QD) nanocomposites are promising for optoelectronics like photodetectors and solar cells.
Combining QDs' optical properties with graphene's electrical properties can boost solar cell efficiency.
Functionalized reduced graphene oxide (f-rGO) is explored to enhance QD-based solar cell active layers.

Purpose of the Study:

To investigate the effect of (3-mercaptopropyl) trimethoxysilane functionalized reduced graphene oxide (f-rGO) on quantum dot (QD) solar cells.
To explore different strategies for embedding f-rGO within the QD active layer.
To correlate structural and electrical improvements with enhanced solar cell performance.

Main Methods:

Fabrication of QD-based solar cells with varying f-rGO integration strategies.
Insertion of f-rGO interlayers between lead sulfide (PbS) QD layers.
Characterization of morphological and electrical properties of the fabricated solar cells.

Main Results:

Solar cells with f-rGO interlayers exhibited significantly higher current density and fill factor.
Improved layer homogeneity and reduced trap-state densities were observed.
Higher charge carrier concentrations and effective blocking of minor charge carriers contributed to efficiency gains.

Conclusions:

Embedding f-rGO as interlayers is an effective strategy to enhance the performance of QD-based solar cells.
The improvements are attributed to better film morphology, reduced charge carrier recombination, and enhanced charge transport.
This approach offers a pathway for developing more efficient next-generation solar cells.