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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: Aug 20, 2025

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

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Published on: March 2, 2021

Simple Solvent Treatment Enabled Improved PEDOT:PSS Performance toward Highly Efficient Binary Organic Solar Cells.

Shasha Shi^1,2, Yiwen Hou¹, Tao Yang¹

¹Julong College, Shenzhen Technology University, Shenzhen 518118, China.

|November 21, 2022

Summary

A novel dopant-free method enhances PEDOT:PSS phase separation for improved charge transport in organic solar cells (OSCs). This leads to high power conversion efficiencies (PCEs) in various OSC device architectures.

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Published on: January 29, 2017

Area of Science:

Materials Science
Organic Electronics
Photovoltaics

Background:

Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) is a key hole-transporting material (HTM) in organic solar cells (OSCs).
PEDOT:PSS performance is critical for achieving high power conversion efficiency (PCE) but faces challenges from alternative materials and doping strategies.
Optimizing conductivity, work function, and surface properties of PEDOT:PSS is essential for advancing OSC technology.

Purpose of the Study:

To develop a simple, dopant-free method for tuning the phase separation of PEDOT:PSS layers.
To improve charge transport and extraction within OSC devices by modifying PEDOT:PSS.
To achieve high PCEs in OSCs using engineered PEDOT:PSS layers.

Main Methods:

A dopant-free approach was employed to control the phase separation of the PEDOT:PSS layer.
The modified PEDOT:PSS layer was integrated into organic solar cell devices.
Device performance, including PCE, was evaluated for different OSC architectures.

Main Results:

Simultaneous high PCEs exceeding 18% for polymer-small-molecule OSCs and 17% for polymer-polymer OSCs were achieved.
The dopant-free modification significantly improved charge transport and extraction in the devices.
The method demonstrated an effective strategy for enhancing PEDOT:PSS properties without doping.

Conclusions:

A simple, dopant-free method effectively tunes PEDOT:PSS phase separation, enhancing OSC performance.
This approach offers a viable strategy for improving charge transport and extraction in organic solar cells.
The findings provide valuable insights for optimizing PEDOT:PSS properties and advancing OSC device efficiency.