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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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Updated: May 4, 2026

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

Published on: September 8, 2017

Low-temperature solution-processed perovskite solar cells with high efficiency and flexibility.

Jingbi You¹, Ziruo Hong, Yang Michael Yang

¹Department of Materials Science and Engineering and ‡California NanoSystems Institute, University of California-Los Angeles , Los Angeles, California 90095, United States.

|January 7, 2014

Summary

This summary is machine-generated.

This study presents a low-temperature processing method for high-efficiency perovskite solar cells. The technique achieves significant power conversion efficiency on both rigid and flexible substrates, paving the way for wider adoption.

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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

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Area of Science:

Materials Science
Renewable Energy
Nanotechnology

Background:

Perovskite solar cells are gaining traction in photovoltaic research.
Current fabrication methods often require high-temperature processing (e.g., 450 °C for TiO2 electron transport layers), limiting scalability.
Alternative low-temperature methods are crucial for widespread adoption.

Purpose of the Study:

To develop a low-temperature processing technique for high-efficiency perovskite solar cells.
To demonstrate the feasibility of this technique on both rigid and flexible substrates.
To investigate the performance of mixed halide perovskite solar cells fabricated via solution processing.

Main Methods:

Fabrication of perovskite solar cells using a device structure: substrate/ITO/PEDOT:PSS/CH(3)NH(3)PbI(3-x)Cl(x)/PCBM/Al.
Utilized PEDOT:PSS as the hole transport layer and PCBM as the electron transport layer.
Employed a low-temperature solution-processing technique with all layers processed under 120 °C.

Main Results:

Achieved a power conversion efficiency (PCE) of 11.5% on rigid substrates (glass/ITO).
Attained a PCE of 9.2% on flexible polyethylene terephthalate/ITO substrates.
Mixed halide perovskite (CH(3)NH(3)PbI(3-x)Cl(x)) demonstrated favorable carrier lifetime and electrical properties.

Conclusions:

The developed low-temperature processing technique is effective for fabricating high-efficiency perovskite solar cells.
This method is suitable for both rigid and flexible device architectures.
The findings support the potential for cost-effective and scalable production of perovskite photovoltaics.