Quantitative relations between interaction parameter, miscibility and function in organic solar cells

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Long Ye
  • Huawei Hu
  • Masoud Ghasemi
  • Tonghui Wang
  • Brian A Collins
  • Joo-Hyun Kim
  • Joshua H. Carpenter
  • Hong Li
  • Zhengke Li
  • Terry McAfee
  • Jingbo Zhao
  • Joshua Lin Yuk Lai
  • Tingxuan Ma
  • Jean-Luc Bredas
  • He Yan
  • Harald Ade

Detail(s)

Original languageEnglish
Pages (from-to)253-260
Number of pages8
Journal / PublicationNature Materials
Volume17
Issue number3
Online published5 Feb 2018
Publication statusPublished - Mar 2018
Externally publishedYes

Abstract

Although it is known that molecular interactions govern morphology formation and purity of mixed domains of conjugated polymer donors and small-molecule acceptors, and thus largely control the achievable performance of organic solar cells, quantifying interaction-function relations has remained elusive. Here, we first determine the temperature-dependent effective amorphous-amorphous interaction parameter, χaa(T), by mapping out the phase diagram of a model amorphous polymer:fullerene material system. We then establish a quantitative 'constant-kink-saturation' relation between χaa and the fill factor in organic solar cells that is verified in detail in a model system and delineated across numerous high- and low-performing materials systems, including fullerene and non-fullerene acceptors. Our experimental and computational data reveal that a high fill factor is obtained only when χaa is large enough to lead to strong phase separation. Our work outlines a basis for using various miscibility tests and future simulation methods that will significantly reduce or eliminate trial-and-error approaches to material synthesis and device fabrication of functional semiconducting blends and organic blends in general.

Research Area(s)

  • ELECTRON-ACCEPTORS, POLYMER BLENDS, DOMAIN PURITY, PERFORMANCE, MORPHOLOGY, EFFICIENCY, STABILITY, MIXTURES, CRYSTALLIZATION, DEPENDENCE

Citation Format(s)

Quantitative relations between interaction parameter, miscibility and function in organic solar cells. / Ye, Long; Hu, Huawei; Ghasemi, Masoud et al.
In: Nature Materials, Vol. 17, No. 3, 03.2018, p. 253-260.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review