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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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Polycrystalline Silicon Thin-film Solar cells with Plasmonic-enhanced Light-trapping

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A Simple and Effective Phosphine-Doping Technique for Solution-Processed Nanocrystal Solar Cells.

Chenbo Min¹, Yihui Chen¹, Yonglin Yang¹

¹School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.

Nanomaterials (Basel, Switzerland)

|June 10, 2023

Summary

A novel phosphine-doping technique enhances cadmium telluride (CdTe) nanocrystal solar cells. This method improves power conversion efficiency and device stability, offering a promising advancement for CdTe solar cell technology.

Keywords:

cadmium telluride nanocrystals phosphine-doping technique photovoltaic device

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Fabrication of Fully Solution Processed Inorganic Nanocrystal Photovoltaic Devices

Fabrication of Fully Solution Processed Inorganic Nanocrystal Photovoltaic Devices

Published on: July 8, 2016

Area of Science:

Materials Science
Nanotechnology
Renewable Energy

Background:

Solution-processed cadmium telluride (CdTe) nanocrystal (NC) solar cells are cost-effective and suitable for large-scale production.
Undecorated CdTe NC solar cells suffer from performance limitations due to crystal boundaries.
Organic hole transport layers (HTLs) improve performance but introduce parasitic resistance, increasing contact resistance.

Purpose of the Study:

To develop a simple phosphine-doping technique for enhancing CdTe NC solar cell performance.
To investigate the impact of phosphine doping on device efficiency and stability.
To address the issue of contact resistance in CdTe NC solar cells.

Main Methods:

A solution process under ambient conditions was used for phosphine doping.
Triphenylphosphine (TPP) was employed as the phosphine source.
Device performance was evaluated through power conversion efficiency (PCE) measurements and stability tests.

Main Results:

The phosphine-doping technique successfully improved the power conversion efficiency (PCE) of CdTe NC solar cells to 5.41%.
The doped devices exhibited extraordinary stability compared to control devices.
Characterizations revealed increased carrier concentration, enhanced hole mobility, and a longer carrier lifetime in the doped NCs.

Conclusions:

A simple and effective phosphine-doping strategy using TPP has been developed for CdTe NC solar cells.
This doping method significantly enhances both the power conversion efficiency and operational stability of the devices.
The findings present a new avenue for advancing the performance of solution-processed CdTe NC solar cells.