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Published on: April 25, 2018
Naphthodifuran-based zigzag-type polycyclic arene with conjugated side chains for efficient photovoltaics
Hongjian Peng1, Xiangfeng Luan, Liuliu Feng
1College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China. yingpingzou@csu.edu.cn amani323@sina.com.
New zigzag angular-fused naphthodifuran (zNDF) polymers show promise for organic photovoltaics. A copolymer achieved 6.9% power conversion efficiency in a solar cell, demonstrating high performance for zNDF-based materials.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Ladder-type conjugated structures offer excellent optoelectronic properties for organic photovoltaics (OPVs).
- Rigid, coplanar molecular frameworks enhance conjugation and intermolecular interactions.
- Developing novel donor-acceptor polymers is crucial for advancing OPV performance.
Purpose of the Study:
- To design and synthesize a novel "zigzag" angular-fused naphthodifuran (zNDF) building block.
- To create new medium bandgap donor-acceptor polymers incorporating the zNDF unit.
- To investigate the photovoltaic properties of these novel polymers in OPV devices.
Main Methods:
- Synthesis of a distannylated zNDF building block.
- Stille cross-coupling polymerization with brominated acceptor units (Br-BT and Br-ffQx).
- Fabrication and characterization of bulk heterojunction solar cells using the synthesized polymers blended with PC71BM.
Main Results:
- Two new donor-acceptor polymers, PzNDFP-BT and PzNDFP-ffQx, were successfully synthesized.
- The polymer PzNDFP-BT blended with PC71BM achieved a power conversion efficiency (PCE) of 6.9%.
- This efficiency was obtained with a 1:1.5 polymer:acceptor ratio and 0.25% 1,8-diiodooctane (DIO) additive.
Conclusions:
- The novel zNDF unit is a promising building block for high-performance organic photovoltaic materials.
- The synthesized PzNDFP-BT polymer demonstrates excellent potential for efficient organic solar cells.
- The achieved 6.9% efficiency represents a significant advancement for zNDF-based polymer solar cells.
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