Energy level tuning of ‘Z’-shaped small molecular non-fullerene electron acceptors based on a dipyrrolo[2,3-b:2′,3′-e]pyrazine-2,6(1H,5H)-dione acceptor unit for organic photovoltaic applications: a joint experimental and DFT investigation on the effect of fluorination

2019 ◽  
Vol 43 (13) ◽  
pp. 5173-5186 ◽  
Author(s):  
Gangala Sivakumar ◽  
Mahalingavelar Paramasivam ◽  
Dyaga Bharath ◽  
Vaidya Jayathirtha Rao
Keyword(s):  
Energy Level ◽  
Small Molecule ◽  
Electron Acceptors ◽  
Organic Photovoltaic ◽  
Photovoltaic Applications

Three dipyrrolo[2,3-b:2′,3′-e]pyrazine-2,6(1H,5H)-dione based small molecule non-fullerene acceptors with various end-capped fluorine units have been investigated.

Energy-Level Modulation of Small-Molecule Electron Acceptors to Achieve over 12% Efficiency in Polymer Solar Cells

2016 ◽  
Vol 28 (42) ◽  
pp. 9423-9429 ◽  
Author(s):  
Sunsun Li ◽  
Long Ye ◽  
Wenchao Zhao ◽  
Shaoqing Zhang ◽  
Subhrangsu Mukherjee ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Small Molecule ◽  
Polymer Solar Cells ◽  
Electron Acceptors

scholarly journals Impact of substituents on the performance of small-molecule semiconductors in organic photovoltaic devices via regulating morphology

2022 ◽  
Author(s):  
Mitsuharu Suzuki ◽  
Kanta Suzuki ◽  
Taehyun Won ◽  
Hiroko Yamada
Keyword(s):  
Organic Semiconductors ◽  
Active Layer ◽  
Small Molecule ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Photovoltaic Applications

This review summarizes recent prominent examples of substituent engineering on small-molecule organic semiconductors for photovoltaic applications, focusing on flexible substituents that regulate the active-layer morphology.

scholarly journals Energy Level Modulation of HOMO, LUMO, and Band-Gap in Conjugated Polymers for Organic Photovoltaic Applications

2012 ◽  
Vol 23 (4) ◽  
pp. 439-445 ◽  
Author(s):  
Bong-Gi Kim ◽  
Xiao Ma ◽  
Chelsea Chen ◽  
Yutaka Ie ◽  
Elizabeth W. Coir ◽  
...  
Keyword(s):  
Energy Level ◽  
Conjugated Polymers ◽  
Band Gap ◽  
Organic Photovoltaic ◽  
Photovoltaic Applications ◽  
Homo Lumo

Annealing-free efficient organic solar cells via an alkylbenzene side-chain strategy of small-molecule electron acceptors

2020 ◽  
Vol 8 (42) ◽  
pp. 22155-22162
Author(s):  
Yufang Han ◽  
Wei Song ◽  
Jinsheng Zhang ◽  
Lin Xie ◽  
Jingbo Xiao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
High Efficiency ◽  
Electron Acceptors ◽  
Organic Photovoltaic ◽  
Side Chain

14.54% high efficiency for annealing-free organic solar cells is achieved by employing a binary PM6:C6 system, and it is one of the highest PCEs of annealing-free OSCs up to now and can promote the development of the organic photovoltaic industry.

scholarly journals The Effects of Molecular Packing Behavior of Small-Molecule Acceptors in Ternary Organic Solar Cells

2021 ◽  
Vol 11 (2) ◽  
pp. 755
Author(s):  
Eunhee Lim
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Ternary System ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Orbital Energy ◽  
Working Mechanism ◽  
Energy Level Structure ◽  
The Third ◽  
Molecular Backbone

Herein, two diketopyrrolopyrrole (DPP)-based, small-molecule isomers, o- and p-DPP-PhCN, were introduced as acceptors in ternary organic solar cells (OSCs). The isomers have the same molecular backbone but differ in the positions of the cyanide (CN) substituents (ortho and para), which greatly affects their packing behavior. Ternary solar cells composed of poly(3-hexylthiophene) (P3HT):DPP-PhCN:phenyl-C61-butyric acid methyl ester (PCBM) were fabricated, and the effects of the different packing behaviors of the third component on the device performance and the working mechanism of the ternary cells were investigated. The addition of o-DPP-PhCN with a relatively high-lying lowest unoccupied molecular orbital energy level resulted in an increase in the open-circuit voltage (VOC) in the ternary devices, demonstrating the alloy-like structure of the two acceptors (o-DPP-PhCN and PCBM) in the ternary system. However, the p-DPP-PhCN-based ternary cells exhibited VOC values similar to that of a P3HT:PCBM binary cell, irrespective of the addition of p-DPP-PhCN, indicating a cascade energy-level structure in the ternary system and an effective charge transfer from the P3HT to the PCBM. Importantly, by increasing the addition of p-DPP-PhCN, the short-circuit current density increased substantially, resulting in pronounced shoulder peaks in the external quantum efficiency responses in the long-wavelength region, corresponding to the contribution of the photocurrent generated by the light absorption of p-DPP-PhCN. Despite sharing the same molecular backbone, the two DPP-PhCNs exhibited substantially different packing behaviors according to the position of their CN substituents, which also greatly affected the working mechanism of the ternary devices fabricated using the DPP-PhCNs as the third component.

A low bandgap polymer based on isoindigo and bis(dialkylthienyl)benzodithiophene for organic photovoltaic applications

2012 ◽  
Vol 51 (1) ◽  
pp. 94-100 ◽  
Author(s):  
Kangli Cao ◽  
Zhongwei Wu ◽  
Shugang Li ◽  
Baoquan Sun ◽  
Guobing Zhang ◽  
...  
Keyword(s):  
Organic Photovoltaic ◽  
Low Bandgap ◽  
Photovoltaic Applications

Direct connection of an amine to oligothiophene to generate push-pull chromophores for organic photovoltaic applications

2019 ◽  
Vol 162 ◽  
pp. 315-323 ◽  
Author(s):  
Anubha Agarwal ◽  
Amanpreet Kaur Hundal ◽  
Jing-Yu Chen ◽  
Ante Bilic ◽  
Wanchun Xiang ◽  
...  
Keyword(s):  
Organic Photovoltaic ◽  
Direct Connection ◽  
Photovoltaic Applications

Controlling C60 fullerene nanocolumn morphology for organic photovoltaic applications

2011 ◽  
Author(s):  
Michael Thomas ◽  
Brian J. Worfolk ◽  
David A. Rider ◽  
Michael T. Taschuk ◽  
Jillian M. Buriak ◽  
...  
Keyword(s):  
Organic Photovoltaic ◽  
Photovoltaic Applications
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