Ternary organic solar cells with enhanced open circuit voltage
Journal article, 2017

By introducing a non-fullerene small molecule acceptor as a third component to typical polymer donor: fullerene acceptor binary solar cells, we demonstrate that the short circuit current density (Jsc), open circuit voltage (Voc), power conversion efficiency (PCE) and thermal stability can be enhanced simultaneously. The different surface energy of each component causes most of the non-fullerene acceptor molecules to self-organize at the polymer/fullerene interface, while the appropriately selected oxidation/reduction potential of the non-fullerene acceptor enables the resulting ternary junction to work through a cascade mechanism. The cascade ternary junction enhances charge generation through complementary absorption between the non-fullerene and fullerene acceptors and aids the efficient charge extraction from fullerene domains. The bimolecular recombination in the ternary blend layer is reduced as the ternary cascade junction increases the separation of holes and electrons during charge transportation and the trap assistant recombination induced by integer charge transfer (ICT) state potentially reduced due to the smaller pinning energy of inserted non-fullerene acceptor, leading to an unprecedented increase in the open circuit voltage beyond the binary reference values.

More thermal stable

Generality

Ternary organic solar cell

Higher open circuit voltage

Self-organization

Author

C. F. Wang

Linköping University

Xiaofeng Xu

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

Wei Zhang

Lund University

Sadok Ben Dkhil

Aix Marseille University

Xiangyi Meng

Xi'an Jiaotong University

Xianjie Liu

Linköping University

Olivier Margeat

Aix Marseille University

Arkady Yartsev

Lund University

W. Ma

Xi'an Jiaotong University

Jörg Ackermann

Aix Marseille University

Ergang Wang

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

M. Fahlman

Linköping University

Nano Energy

2211-2855 (ISSN)

Vol. 37 24-31

Subject Categories

Condensed Matter Physics

DOI

10.1016/j.nanoen.2017.04.060

More information

Latest update

4/4/2018 6