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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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All-3D-Printed PEDOT:PSS-Based Stretchable Thermoelectric Devices for Power Generation.

Wenjing Fan¹, Qiang Yin^1,2, Qi Wang¹

¹School of Chemistry and Materials Science, East China University of Technology, Nanchang 330013, Jiangxi, P. R. China.

ACS Applied Materials & Interfaces

|July 1, 2025

Summary

Researchers developed a stretchable thermoelectric composite using poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and a 3D printing method. This enables robust, integrated flexible thermoelectric devices for wearable energy harvesting.

Keywords:

PEDOT:PSS all 3D printing output stability stretchable thermoelectric devices wearable energy harvesting

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Area of Science:

Materials Science
Energy Harvesting
Wearable Electronics

Background:

Flexible thermoelectric devices (F-TEDs) offer sustainable energy harvesting for wearables.
Challenges include material stretchability, mechanical performance, and device integration complexities.
Existing methods struggle with robust fabrication for practical applications.

Purpose of the Study:

To develop a stretchable thermoelectric composite and an all 3D printing fabrication method.
To overcome mechanical and manufacturing limitations for seamless integration in wearable electronics.
To create robust, high-performance flexible thermoelectric devices.

Main Methods:

Developed a stretchable poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composite.
Engineered a viscoelastic ink optimized for high-resolution, multimaterial 3D printing.
Utilized an all 3D printing approach for device fabrication.

Main Results:

The composite shows superior tensile strength and stretchability, retaining thermoelectric properties.
All-3D-printed devices exhibit remarkable mechanical and electrical stability.
Devices achieved an open voltage of 3.18 mV and power density of 6.78 nW cm^-2 at 40 K.
Stable performance under >50% strain and over 2000 stretching cycles.
Successfully powered an LED using harvested body heat during dynamic motion.

Conclusions:

This work presents a scalable, mechanically resilient platform for integrated thermoelectric energy harvesting.
The developed composite and 3D printing method overcome key challenges in flexible thermoelectric device fabrication.
Advances the development of self-powered wearable electronics through robust energy harvesting solutions.