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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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Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer

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Binary All-polymer Solar Cells with a Perhalogenated-Thiophene-Based Solid Additive Surpass 18 % Efficiency.

Wanying Feng^1,2, Tianqi Chen¹, Yulu Li³

¹School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, 300350, Tianjin, China.

Angewandte Chemie (International Ed. in English)

|January 3, 2024

Summary

Researchers developed new solid additives (SAs) to improve all-polymer organic solar cells (APSCs). These perhalogenated thiophenes enhanced device performance, achieving a record power conversion efficiency (PCE) of 18.3% for organic solar cells.

Keywords:

All-Polymer Solar Cells Halogenated Thiophene High-Efficiency Morphology Solid Additives

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Area of Science:

Materials Science
Organic Electronics
Photovoltaics

Background:

Morphological control in all-polymer blends is crucial for high-performance organic solar cells.
Solid additives (SAs) have shown promise in optimizing morphology for polymer: small-molecule blends.

Purpose of the Study:

To investigate the use of three perhalogenated thiophenes as SAs for optimizing all-polymer organic solar cells (APSCs).
To enhance the power conversion efficiency (PCE) and stability of APSCs through morphological tuning.

Main Methods:

Synthesis and characterization of three perhalogenated thiophenes (SA-T1, SA-T2, SA-T3).
Fabrication and testing of all-polymer solar cells using PM6:PY-IT blends with and without SAs.
In situ UV/Vis spectroscopy to study morphological evolution.

Main Results:

Introduction of perhalogenated thiophenes finely regulated molecular packing and optimized morphology in PM6:PY-IT blends.
SA-treated devices showed enhanced power conversion efficiencies (PCE) ranging from 17.4% to 18.3%.
SA-T1 achieved a record PCE of 18.3% for binary APSCs, with demonstrated universality in other blends.

Conclusions:

Perhalogenated thiophenes serve as effective solid additives for optimizing APSC morphology and performance.
The developed SAs offer a new strategy for achieving high-efficiency and stable all-polymer organic solar cells.
SA-T1 shows significant potential for advancing the field of organic photovoltaics.