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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...

Carrier Transport

Carrier Transport

The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:

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Related Experiment Video

Updated: Jul 23, 2025

Fabrication of Fully Solution Processed Inorganic Nanocrystal Photovoltaic Devices

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Published on: July 8, 2016

Charge Transport Layer Engineering toward Efficient and Stable Colloidal Quantum Dot Solar Cells.

Yannan Zhang^1,2, Zeke Liu^2,3, Wanli Ma^2,3

¹School of Photoelectric Engineering, Changzhou Institute of Technology, Changzhou 213032, P. R. China.

The Journal of Physical Chemistry Letters

|July 11, 2023

Summary

Lead sulfide (PbS) colloidal quantum dot (CQD) solar cells show promise as a solution-processed photovoltaic technology. Advances in charge transport layers and passivation have significantly boosted their efficiency and stability.

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Area of Science:

Materials Science
Energy Science
Nanotechnology

Background:

Lead sulfide (PbS) colloidal quantum dot (CQD) solar cells are a promising solution-processed photovoltaic technology.
Initial research focused on CQD surface passivation and device structure optimization.

Purpose of the Study:

To summarize recent advancements in charge transport layers and interfacial passivation for PbS CQD solar cells.
To discuss challenges and future directions for improving performance and stability.

Main Methods:

Review of recent research progress in transport layer materials and device structures.
Analysis of interfacial passivation strategies for PbS CQD solar cells.

Main Results:

Development of new charge transport layers and interfacial passivation strategies has significantly improved device efficiency.
Enhanced stability has been achieved through recent material and structural optimizations.

Conclusions:

Charge transport layers are critical for high-performance and stable PbS CQD solar cells.
Further development in this area holds potential for practical optoelectronic applications.