Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



Charge density modulation on asymmetric fused-ring acceptors for high-efficiency photovoltaic solar cells

Author affiliations

Abstract

Charge density modulation on a thieno[2′′,3′′:5′,6′]-s-indaceno[2′,1′:4,5]dithieno[3,2-b:2′,3′-d]pyrrole (IPT) core has been conducted for a systematic study of its impact on the electronic structure, molecular packing and photovoltaic performance of asymmetric fused-ring acceptors (FRAs). Herein, a series of IPT-based FRAs (i.e. IN-4F, INO-4F, IPT-4F and IPCl-4F) are designed by incorporating 2-ethylhexyl, 2-ethylhexyloxy, hydrogen and chloro side chains, respectively, onto the IPT core. Enhancing the electron-withdrawing ability of the side-chains decreases the optical bandgap but lowers the lowest unoccupied molecular orbital (LUMO) level, which yields a trade-off between JSC and VOC in organic solar cells (OSCs). Furthermore, the FRAs exhibit tunable miscibility and crystallinity, reflected in the FF and JSC values of the OSCs. By pairing with polymer donor PM6, IPT-4F based devices achieve the highest PCE of 14.62% with a balanced VOC of 0.88 V and JSC of 22.15 mA cm−2 and a high FF of 75.01%. Our research demonstrates that electronic density modulation on asymmetric FRAs is an effective way to systematically optimize the device parameters in pursuit of high performance OSCs.

Graphical abstract: Charge density modulation on asymmetric fused-ring acceptors for high-efficiency photovoltaic solar cells

Back to tab navigation

Supplementary files

Article information


Submitted
29 Feb 2020
Accepted
31 Mar 2020
First published
02 Apr 2020

Mater. Chem. Front., 2020, Advance Article
Article type
Research Article

Charge density modulation on asymmetric fused-ring acceptors for high-efficiency photovoltaic solar cells

Z. Zhang, L. Yang, Z. Hu, J. Yu, X. Liu, H. Wang, J. Cao, F. Zhang and W. Tang, Mater. Chem. Front., 2020, Advance Article , DOI: 10.1039/D0QM00123F

Social activity

Search articles by author

Spotlight

Advertisements