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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: May 13, 2026

Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells

Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells

Published on: November 5, 2014

Panchromatic quantum-dot-sensitized solar cells based on a parallel tandem structure.

Na Zhou¹, Yueyong Yang, Xiaoming Huang

¹Key Laboratory for Renewable Energy (CAS), Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, PR China.

|March 16, 2013

Summary

Researchers developed a novel tandem quantum dot solar cell (QDSC) using two compartments with different quantum dots (QDs) to broaden light absorption. This design achieved a high solar power conversion efficiency of 5.06%.

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Published on: August 23, 2012

Area of Science:

Materials Science
Renewable Energy
Nanotechnology

Background:

Current solar cell technologies face limitations in light absorption range.
Quantum dots (QDs) offer tunable optical properties for enhanced light harvesting.
Tandem solar cell structures can improve overall efficiency by utilizing a broader solar spectrum.

Purpose of the Study:

To design and fabricate a novel tandem-structure sensitized solar cell for the first time.
To extend the light-absorption range beyond current solar technologies.
To investigate the performance of a multi-compartment QDSC with different sensitizers.

Main Methods:

Fabrication of a tandem QDSC with two compartments: an upper CdS/CdSe co-sensitized QDSC and a lower PbS/CdS co-sensitized QDSC.
Integration of a Cu2S mesh counter electrode in the middle of the tandem structure.
Optimization of electrode thickness and QD deposition time.

Main Results:

Achieved a short-circuit photocurrent density of 25.12 mA cm(-2), nearing the sum of individual devices.
Demonstrated a solar power conversion efficiency of 5.06%.
The tandem structure effectively broadened light absorption by combining different QD sensitizers.

Conclusions:

The novel tandem QDSC design successfully extends light absorption and enhances solar cell performance.
Optimization of fabrication parameters is crucial for maximizing photocurrent and efficiency.
This approach represents a promising advancement in quantum dot solar cell technology.