Suppressing Co-Crystallization of Halogenated Non-Fullerene Acceptors for Thermally Stable Ternary Solar Cells
Artikel i vetenskaplig tidskrift, 2020

While photovoltaic blends based on non-fullerene acceptors are touted for their thermal stability, this type of acceptor tends to crystallize, which can result in a gradual decrease in photovoltaic performance and affects the reproducibility of the devices. Two halogenated indacenodithienothiophene-based acceptors that readily co-crystallize upon mixing are studied, which indicates that the use of an acceptor mixture alone does not guarantee the formation of a disordered mixture. The addition of the donor polymer to the acceptor mixture readily suppresses the crystallization, which results in a fine-grained ternary blend with nanometer-sized domains that do not coarsen due to a high Tg ≈ 200 °C. As a result, annealing at temperatures of up to 170 °C does not markedly affect the photovoltaic performance of ternary devices, in contrast to binary devices that suffer from acceptor crystallization in the active layer. The results indicate that the ternary approach enables the use of high-temperature processing protocols, which are needed for upscaling and high-throughput fabrication of organic solar cells. Further, ternary devices display a stable photovoltaic performance at 130 °C for at least 205 h, which indicates that the use of acceptor mixtures allows to fabricate devices with excellent thermal stability.

glass transition temperatures

suppressed crystallization

co-crystals

ternary solar cells

non-fullerene acceptors

Författare

Sandra Hultmark

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Christian Müller Group

Sri Harish Kumar Paleti

King Abdullah University of Science and Technology (KAUST)

Albert Harillo

Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)

Sara Marina

Institute for Polymer Materials, San Sebastian

Basque Foundation for Science (Ikerbasque)

Ferry Nugroho

Chalmers, Fysik, Kemisk fysik

Yanfeng Liu

Linköpings universitet

L. K. E. Ericsson

Karlstads universitet

Ruipeng Li

Brookhaven National Laboratory

Jaime Martín

Institute for Polymer Materials, San Sebastian

Basque Foundation for Science (Ikerbasque)

J. Bergqvist

Linköpings universitet

Christoph Langhammer

Chalmers, Fysik, Kemisk fysik

Fengling Zhang

Linköpings universitet

Liyang Yu

Sichuan University

M. Campoy-Quiles

Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)

Ellen Moons

Karlstads universitet

Derya Baran

King Abdullah University of Science and Technology (KAUST)

Christian Müller

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Christian Müller Group

Advanced Functional Materials

1616-301X (ISSN)

Vol. In Press

Ämneskategorier

Oorganisk kemi

Keramteknik

Materialkemi

DOI

10.1002/adfm.202005462

Mer information

Senast uppdaterat

2020-11-30