Achieving high performance non-fullerene organic solar cells through tuning the numbers of electron deficient building blocks of molecular acceptors

Two novel selenophene-containing building blocks have been developed as central cores to construct high-performance asymmetric non-fullerene acceptors (SePTT-2F and SePTTT-2F). Organic solar cells based on SePTTT-2F with more extended backbone conjugation delivered a high efficiency of 12.24% with an outstanding fill factor of 75.9%.

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A Non-fullerene Electron Acceptor with Benzotrithiophene and π-Extension Terminal Group for Development of High-Efficiency Organic Solar Cells

Journal of Materials Chemistry C ◽

10.1039/d1tc03259c ◽

2021 ◽

Author(s):

Shanshan Ma ◽

Qiri Huang ◽

Yuanying Liang ◽

Haoran Tang ◽

Yanwei Chen ◽

...

Keyword(s):

Solar Cells ◽

Electron Acceptor ◽

Organic Solar Cells ◽

High Performance ◽

High Efficiency ◽

Building Blocks ◽

Terminal Group ◽

Electron Acceptors ◽

Active Materials

Developing novel building blocks is essentially important to construct high-performance non-fullerene electron acceptors (NFEAs). Benzotrithiophene (BTT) as an electron-donating block has been widely applied in active materials to obtain high-performance...

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High-Performance and Low-Energy Loss Organic Solar Cells with Non-fused Ring Acceptor by Alkyl Chain Engineering

Chemical Engineering Journal ◽

10.1016/j.cej.2021.129768 ◽

2021 ◽

pp. 129768

Author(s):

Dou Luo ◽

Xue Lai ◽

Nan Zheng ◽

Chenghao Duan ◽

Zhaojin Wang ◽

...

Keyword(s):

Solar Cells ◽

Energy Loss ◽

Organic Solar Cells ◽

High Performance ◽

Alkyl Chain ◽

Low Energy ◽

Fused Ring

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A Facile Synthesized Polymer Featuring B‐N Covalent Bond and Small Singlet‐Triplet Gap for High‐Performance Organic Solar Cells

Angewandte Chemie International Edition ◽

10.1002/anie.202016265 ◽

2021 ◽

Vol 60 (16) ◽

pp. 8813-8817

Author(s):

Shuting Pang ◽

Zhiqiang Wang ◽

Xiyue Yuan ◽

Langheng Pan ◽

Wanyuan Deng ◽

...

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

High Performance ◽

Covalent Bond

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High performance tandem organic solar cells via a strongly infrared-absorbing narrow bandgap acceptor

Nature Communications ◽

10.1038/s41467-020-20431-6 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Zhenrong Jia ◽

Shucheng Qin ◽

Lei Meng ◽

Qing Ma ◽

Indunil Angunawela ◽

...

Keyword(s):

Solar Cells ◽

Power Conversion Efficiency ◽

Conversion Efficiency ◽

Organic Solar Cells ◽

High Performance ◽

Short Circuit ◽

Power Conversion ◽

High Power Conversion Efficiency ◽

Device Structure ◽

Narrow Bandgap

AbstractTandem organic solar cells are based on the device structure monolithically connecting two solar cells to broaden overall absorption spectrum and utilize the photon energy more efficiently. Herein, we demonstrate a simple strategy of inserting a double bond between the central core and end groups of the small molecule acceptor Y6 to extend its conjugation length and absorption range. As a result, a new narrow bandgap acceptor BTPV-4F was synthesized with an optical bandgap of 1.21 eV. The single-junction devices based on BTPV-4F as acceptor achieved a power conversion efficiency of over 13.4% with a high short-circuit current density of 28.9 mA cm−2. With adopting BTPV-4F as the rear cell acceptor material, the resulting tandem devices reached a high power conversion efficiency of over 16.4% with good photostability. The results indicate that BTPV-4F is an efficient infrared-absorbing narrow bandgap acceptor and has great potential to be applied into tandem organic solar cells.

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