Alcohol-Soluble Conjugated Polymers as Cathode Interlayers for All-Polymer Solar Cells
Journal article, 2018

Conjugated polymers with polar side-chain components have successfully been used as cathode interfacial materials (CIMs) to improve the performances of polymer solar cells with fullerenes as acceptors. However, their uses and functions in all-polymer solar cells (all-PSCs) have not been well-investigated. Therefore, in this work, four conjugated polymers bearing different functional side chains, including dimethylamine, diethanolamine, and imidazole, were used as CIMs to study their effects on all-PSCs. With a combination of high-performing acceptor and donor polymers as active layers, the performances of the devices based on the four CIMs were compared with conventional devices with LiF/Al and Al as cathode. Compared to the devices with only Al as cathode, the devices comprising conjugated polymers as CIMs presented large improvement in power conversion efficiency from 2.7% to around 5.3%, which is comparable to the devices with LiF/Al as cathode. The encouraging results demonstrated that the use of conjugated interfacial polymers is a robust way to improve the performances of all-PSCs and can elegantly circumvent the use of low work function metals as cathodes. This is very important for roll-to-roll processing of flexible and large-scale solar cells.

interfacial layers

alcohol-soluble

imidazole pendant group

conjugated polymers

all-polymer solar cells

Author

Kim Bini

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Xiaofeng Xu

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Mats Andersson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Ergang Wang

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Ergang Wang Group

ACS Applied Energy Materials

2574-0962 (ISSN)

Vol. 1 5 2176-2182

Subject Categories

Polymer Chemistry

Textile, Rubber and Polymeric Materials

Other Chemistry Topics

Areas of Advance

Energy

Materials Science

DOI

10.1021/acsaem.8b00225

More information

Created

6/9/2018 2