Document Type

Journal Article

Department/Unit

Department of Chemistry; Department of Physics

Language

English

Abstract

This study examines the correlation between the structure of four perylenediimide (PDI) derivatives and their optoelectronic behaviors. Three of them with one, two or four PDI moieties conjugated peripherally to porphyrin core by phenylene linker, denoted as nPDI-ZnP (n = 1,2,4), are investigated as acceptors on the charge transport propertyand device performance in non-fullerene (NF) bulk-heterojunction (BHJ) organic photovoltaic cells with a commercial polymer PTB7-Th as the donor material. Besides, the parent PDI molecule is studied as a control. Detailed charge carrier transport analysis is carried out on these PTB7-Th:Acceptor BHJs. Among all acceptor molecules, PTB7-Th:4PDI-ZnP film possesses the most desirable transport properties among the NF BHJs, and the best device performance with a power conversion efficiency (PCE) of 8.35%. To quantify the transport behaviors, the charge imbalance factor △is introduced to describe the global electron and hole balance in different electric fields. We discover that PTB7-Th:4PDI-ZnP has the least △and thereby gives rise to a BHJ cells with the highest fill factor and PCE.

Keywords

Organic solar cells, Bulk heterojunction, Imbalance factor, Carrier mobility, pdi, Fill factor

Publication Date

3-1-2021

Source Publication Title

Organic Electronics

Volume

65

Start Page

156

End Page

161

Publisher

Elsevier

DOI

10.1016/j.orgel.2018.11.006

Link to Publisher's Edition

https://doi.org/10.1016/j.orgel.2018.11.006

ISSN (print)

15661199

ISSN (electronic)

18785530

Available for download on Monday, March 01, 2021

Share

COinS