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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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Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells

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Published on: November 5, 2014

A hyperbranched conjugated polymer as the cathode interlayer for high-performance polymer solar cells.

Menglan Lv¹, Shusheng Li, Jacek J Jasieniak

¹Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, 610041, China; CSIRO Materials Science and Engineering, Clayton, VIC, 3168, Australia; University of Chinese Academy of Sciences, Beijing, 100049, China.

Advanced Materials (Deerfield Beach, Fla.)

|October 15, 2013

Summary

A novel alcohol-soluble hyperbranched conjugated polymer (HBPFN) functions as an effective cathode interlayer in organic solar cells. This polymer enhances power conversion efficiency (PCE) to 7.7% in PBDTTT-C-T/PC71 BM devices.

Keywords:

cathode interlayer hyperbranched polymer polymer solar cells scanning kelvin probe

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

Published on: January 10, 2017

Area of Science:

Materials Science
Organic Electronics
Polymer Chemistry

Background:

Organic solar cells (OSCs) require efficient charge extraction at electrode interfaces.
Interfacial layers play a crucial role in optimizing OSC performance by modifying work functions and reducing recombination.
Developing new materials for interlayers is essential for advancing OSC technology.

Purpose of the Study:

To synthesize and characterize a novel hyperbranched conjugated polymer (HBPFN) containing a dimethylamino moiety.
To investigate the efficacy of HBPFN as a cathode interlayer in PBDTTT-C-T/PC71 BM based organic solar cells.
To understand the interfacial effects contributing to performance enhancement.

Main Methods:

Synthesis of an alcohol-soluble hyperbranched conjugated polymer (HBPFN) with a dimethylamino group.
Fabrication of PBDTTT-C-T/PC71 BM organic solar cells utilizing HBPFN as a cathode interlayer.
Performance characterization of the solar cells, including power conversion efficiency (PCE) measurements.
Analysis of interfacial properties, including the investigation of interfacial dipoles.

Main Results:

The synthesized HBPFN is alcohol-soluble and suitable for solution processing.
Organic solar cells employing HBPFN as a cathode interlayer achieved a notable PCE of 7.7%.
No significant interfacial dipole was observed at the active layer/HBPFN interface, suggesting other mechanisms are at play.

Conclusions:

The hyperbranched conjugated polymer HBPFN serves as an effective cathode interlayer for organic solar cells.
The enhanced performance, indicated by a 7.7% PCE, is likely influenced by an interfacial dipole formed between HBPFN and the cathode.
HBPFN represents a promising material for improving the efficiency of organic photovoltaic devices.