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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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Related Experiment Video

Updated: Apr 15, 2026

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

Published on: March 2, 2021

Multifunctional MgO Layer in Perovskite Solar Cells.

Xudong Guo¹, Haopeng Dong¹, Wenzhe Li¹

¹Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084 (China).

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry

|April 9, 2015

Summary

Introducing a magnesium oxide (MgO) layer into perovskite solar cells (PSCs) significantly boosts efficiency. This MgO layer enhances photoelectric performance and reduces charge recombination, improving overall cell function.

Keywords:

UV degradation absorption photochemistry solar cells stability

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Last Updated: Apr 15, 2026

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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Published on: March 2, 2021

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Area of Science:

Materials Science
Renewable Energy
Photovoltaics

Background:

Perovskite solar cells (PSCs) are a promising photovoltaic technology.
Enhancing the performance and stability of PSCs is crucial for their commercial viability.
Interfacial engineering plays a key role in optimizing PSC efficiency.

Purpose of the Study:

To introduce a multifunctional magnesium oxide (MgO) layer into PSCs.
To investigate the impact of MgO modification on the TiO(2)/perovskite interface.
To enhance the overall performance and efficiency of perovskite solar cells.

Main Methods:

Magnesium oxide (MgO) layer deposition via magnesium acetate decomposition.
Surface analysis using X-ray photoelectron spectroscopy (XPS) and infrared spectroscopy (IR).
Photoelectric performance evaluation using UV/Vis absorption spectra.
Electrochemical impedance spectroscopy (EIS) for charge recombination analysis.

Main Results:

MgO coating effectively blocked contact between perovskite and TiO(2).
MgO modification reduced water and hydroxyl absorption on TiO(2).
Enhanced UV/Vis absorption and photoelectric performance observed.
Significant improvements in photocurrent, photovoltage, and fill factor.
Overall cell efficiency increased from 9.6% to 13.9%.

Conclusions:

Magnesium oxide is a multifunctional material for enhancing PSC performance.
MgO acts as an effective insulating layer, reducing charge recombination at the interface.
The MgO modification strategy offers a viable route to higher efficiency PSCs.