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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

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

Published on: January 10, 2017

Selective Morphology Control of Bulk Heterojunction in Polymer Solar Cells Using Binary Processing Additives.

Yen-Sook Jung¹, Jun-Seok Yeo², Nam-Koo Kim³

¹School of Materials Science and Engineering, Research Institute for Solar and Sustainable Energies, Gwangju Institute of Science and Technology (GIST) , 261 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, Republic of Korea.

ACS Applied Materials & Interfaces

|November 1, 2016

Summary

Binary additives, 1,8-diiodooctane (DIO) and poly(dimethylsiloxane) (PDMS) precursor, enhance polymer solar cell (PSC) morphology and power conversion efficiency (PCE). This combination improves fill factor (FF) and reduces charge recombination for better device performance.

Keywords:

DIO PDMS resin binary additives bulk heterojunction polymer solar cells

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Published on: March 2, 2021

Area of Science:

Materials Science
Organic Electronics
Renewable Energy

Background:

Polymer solar cells (PSCs) based on bulk heterojunction (BHJ) systems are a promising renewable energy technology.
Morphology control of the BHJ active layer is crucial for optimizing PSC performance.
Additives are commonly used to tune BHJ morphology and improve device efficiency.

Purpose of the Study:

To investigate the synergistic effects of binary additives, 1,8-diiodooctane (DIO) and poly(dimethylsiloxane) (PDMS) precursor, on PSC fabrication.
To understand the distinct roles of DIO and PDMS precursor in modulating BHJ morphology.
To enhance the power conversion efficiency (PCE) of PSCs through optimized BHJ structure.

Main Methods:

Fabrication of PSCs using a BHJ active layer incorporating DIO and PDMS precursor.
Analysis of BHJ morphology using techniques sensitive to phase separation and domain formation.
Characterization of photovoltaic parameters, including power conversion efficiency (PCE) and fill factor (FF), under varying light intensities.

Main Results:

The combined use of DIO and PDMS precursor significantly improved PSC performance, achieving a PCE of 7.6% and enhancing the fill factor (FF) by 6.8% compared to devices with DIO alone.
DIO suppressed large phase separation of PBDTTT-CF and PC71BM, while PDMS precursor facilitated continuous polymer network formation.
The appropriate addition of PDMS precursor did not impede charge transport, and devices with both additives exhibited reduced charge recombination.

Conclusions:

Binary additives, DIO and PDMS precursor, offer complementary functions for effective BHJ morphology control in PSCs.
The synergistic effect of these additives leads to enhanced PCE by improving FF and reducing charge recombination.
This study demonstrates a viable strategy for optimizing PSC performance through rational additive selection.