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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: May 13, 2026

Well-aligned Vertically Oriented ZnO Nanorod Arrays and their Application in Inverted Small Molecule Solar Cells

Well-aligned Vertically Oriented ZnO Nanorod Arrays and their Application in Inverted Small Molecule Solar Cells

Published on: April 25, 2018

Efficient solution-processed small-molecule solar cells with inverted structure.

Aung Ko Ko Kyaw¹, Dong Hwan Wang, Vinay Gupta

¹Center for Polymers and Organic Solids, University of California at Santa Barbara, Santa Barbara, California 93106-5090, USA.

Advanced Materials (Deerfield Beach, Fla.)

|March 2, 2013

Summary

This summary is machine-generated.

We developed efficient inverted small-molecule solar cells using ZnO and PEIE interfacial layers, achieving 7.88% power conversion efficiency. This cost-effective modification enhances stability and performance by reducing cathode work function and suppressing recombination.

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Area of Science:

Materials Science
Renewable Energy
Organic Electronics

Background:

Small-molecule solar cells (SMSCs) are promising for low-cost, flexible electronics.
Inverted solar cell architectures can offer improved stability and performance.
Efficient interfacial layers are crucial for optimizing charge extraction and minimizing energy losses.

Purpose of the Study:

To demonstrate high-efficiency inverted small-molecule solar cells.
To investigate the role of ZnO and PEIE as interfacial layers.
To enhance the performance and stability of small-molecule solar cells.

Main Methods:

Fabrication of inverted small-molecule solar cells utilizing ZnO and PEIE as an interfacial layer.
Characterization of device performance, including power conversion efficiency (PCE) and stability.
Analysis of the effects of the interfacial layer on cathode work function and charge recombination.

Main Results:

Achieved a power conversion efficiency of 7.88% for the inverted small-molecule solar cells.
Demonstrated that PEIE modification of ZnO reduces the cathode work function.
Observed suppression of trap-assisted recombination, leading to improved device performance.
Showcased enhanced air stability of the inverted small-molecule solar cells compared to conventional devices.

Conclusions:

The combination of ZnO and PEIE as an interfacial layer is effective in boosting the efficiency of inverted small-molecule solar cells.
The cost-effective PEIE modification offers a viable strategy for improving solar cell performance and stability.
These findings contribute to the advancement of efficient and stable organic solar cell technologies.