Correlating Acceptor Structure and Blend Nanostructure with the Photostability of Nonfullerene Organic Solar Cells
Artikel i vetenskaplig tidskrift, 2022

The formation of photoinduced traps resulting in the loss of electron mobility deteriorates the performance of organic solar cells under continuous light soaking. The genesis of these loss mechanisms is elucidated by examining the structural stability of halogenated ITIC derivative films and the phase behavior of the respective binary systems by blending with the donor polymer PBDBT-2F. Under constant illumination, ITIC-4Cl is found to maintain its structural integrity, whereas fluorine on the peripheral moieties of ITIC-4F undergoes chemical substitution to form a mixture of ITIC and ITIC-4F. Thermal analysis of the light-soaked binary films reveals that ITIC-4Cl loses its crystalline phase while the crystallinity of ITIC-4F does not undergo changes. Further, it is shown that the addition of a small amount of ITIC-4F as a third component hinders the loss of ITIC-4Cl crystalline phase in bulk heterojunction blends through the formation of cocrystals. These results suggest that long-range ordering of NFAs does not necessarily improve the photostability of organic solar cells and that the addition of a third component, irrespective of the crystalline nature, can prevent changes in bulk heterojunction blend nanostructure.

organic solar cell

nonfullerene

nanostructure

photostability

stability

ITIC

Författare

Sri Harish Kumar Paleti

King Abdullah University of Science and Technology (KAUST)

Sandra Hultmark

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Nicolas Ramos

Universidad del Pais Vasco / Euskal Herriko Unibertsitatea

Nicola Gasparini

Imperial College London

Abdul Hamid Emwas

King Abdullah University of Science and Technology (KAUST)

Jaime Martín

Universidade da Coruña

Universidad del Pais Vasco / Euskal Herriko Unibertsitatea

Basque Foundation for Science (Ikerbasque)

Christian Müller

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Derya Baran

King Abdullah University of Science and Technology (KAUST)

Solar RRL

2367198X (eISSN)

Vol. 6 10 2200436

Ämneskategorier

Oorganisk kemi

Fysikalisk kemi

Annan kemi

DOI

10.1002/solr.202200436

Mer information

Senast uppdaterat

2024-03-07