Issue 43, 2020

Small-molecule electrolytes with different ionic functionalities as a cathode buffer layer for polymer solar cells

Abstract

In polymer solar cells (PSCs), electrolytes as the cathode interlayer are responsible for generating an interface dipole, which reduces the charge collection barrier at the cathode interface. In this study, small-molecule electrolytes were designed and synthesized as the cathode interlayer in inverted PSCs to overcome high processing costs caused by complicated synthesis procedures. Moreover, the proposed design strategy allows changing the ion size and number of ionic functionalities to tune the magnitude of the interface dipole. The structure of ((benzene-1,2,4,5-tetrayltetrakis(methylene))tetrakis(triphenylphosphonium) bromide) (4PBr) comprises a phenyl core with four benzyl triphenylphosphonium salts and (N,N′-(1,2-phenylenebis(methylene))bis(N,N-diethylethanaminium) bromide) (2EBr) has two benzyl trialkyl ammonium salts. The device based on 4PBr exhibited a power conversion efficiency of 10.63% (Jsc = 20.2 mA cm−2, Voc = 0.79 V, and FF = 66.6%), which is superior to that based on 2EBr (PCE = 9.56%, Jsc = 19.7 mA cm−2, Voc = 0.80 V, and FF = 61.1%). Thus, we demonstrated the possibility of maximizing performances without complicated synthesis procedures.

Graphical abstract: Small-molecule electrolytes with different ionic functionalities as a cathode buffer layer for polymer solar cells

Supplementary files

Article information

Article type
Paper
Submitted
26 Mot 2020
Accepted
08 Upu 2020
First published
08 Upu 2020

J. Mater. Chem. C, 2020,8, 15183-15188

Small-molecule electrolytes with different ionic functionalities as a cathode buffer layer for polymer solar cells

M. Jeong, D. K. Moon, H. S. Kim and J. H. Kim, J. Mater. Chem. C, 2020, 8, 15183 DOI: 10.1039/D0TC02513E

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