Issue 11, 2019

Dihydropyreno[1,2-b:6,7-b′]dithiophene based electron acceptors for high efficiency as-cast organic solar cells

Abstract

Two novel fused ring electron acceptors PDT and PDT-T have been designed, synthesized and used in organic solar cells. PDT comprises a central 4,10-bis(hexyloxy)-6,6,12,12-tetrakis(4-hexylphenyl)-6,12-dihydropyreno[1,2-b:6,7-b′]dithiophene (DDT) donor unit and two flanked 2-(5,6-difluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile acceptor units, while PDT-T has an extra thiophene bridge unit between the central donor unit and the acceptor unit. The introduction of a thiophene bridge unit can markedly broaden the absorption of acceptors and enhance the film absorption coefficient. The optical bandgaps of PDT and PDT-T are 1.59 and 1.44 eV, respectively. The photovoltaic performance of these two acceptors was investigated using PBDB-T as the electron donor. Wide photo-current responses extending to 800 nm for PDT based devices and to 900 nm for PDT-T based ones were observed. A power conversion efficiency (PCE) of 7.07% for PBDB-T:PDT based cells was obtained with a Voc of 0.96 V, Jsc of 13.48 mA cm−2 and FF of 54.0%, while the as-cast devices based on PBDB-T:PDT-T gave rise to a PCE of 11.02% with a Voc of 0.88 V, Jsc of 18.88 mA cm−2 and FF of 66.3%. These results highlight that DDT is a promising building block for constructing highly efficient fused ring acceptors and π-bridging can further boost the photovoltaic performance of the devices.

Graphical abstract: Dihydropyreno[1,2-b:6,7-b′]dithiophene based electron acceptors for high efficiency as-cast organic solar cells

Supplementary files

Article information

Article type
Communication
Submitted
17 Janv. 2019
Accepted
19 Febr. 2019
First published
20 Febr. 2019

J. Mater. Chem. A, 2019,7, 5943-5948

Dihydropyreno[1,2-b:6,7-b′]dithiophene based electron acceptors for high efficiency as-cast organic solar cells

P. Jiang, H. Lu, Q. Jia, S. Feng, C. Li, H. Li and Z. Bo, J. Mater. Chem. A, 2019, 7, 5943 DOI: 10.1039/C9TA00614A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements