Controlling Polymorphic Transitions in n-Type Organic Semiconductor Single Crystals by Alkyl Chain Engineering

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

  • Daniel William Davies - , University of Illinois at Urbana-Champaign (Autor:in)
  • Giorgio Graziano - , University of Illinois at Urbana-Champaign (Autor:in)
  • Changhyun Hwang - , University of Illinois at Urbana-Champaign (Autor:in)
  • Sang Kyu Park - , University of Illinois at Urbana-Champaign (Autor:in)
  • Wuyue Liu - , CAS - Institute of Chemistry (Autor:in)
  • Dafei Yuan - , CAS - Institute of Chemistry (Autor:in)
  • Stefan C.B. Mannsfeld - , Professur für Organische Bauelemente (cfaed), Fakultät Physik (Autor:in)
  • Su Yin Grass Wang - , Argonne National Laboratory (Autor:in)
  • Yu Sheng Chen - , Argonne National Laboratory (Autor:in)
  • Danielle L. Gray - , University of Illinois at Urbana-Champaign (Autor:in)
  • Xiaozhang Zhu - , CAS - Institute of Chemistry (Autor:in)
  • Ying Diao - , University of Illinois at Urbana-Champaign (Autor:in)

Abstract

Control of polymorphic behavior is crucial for designing functional organic semiconductor devices as even a slight structural difference may translate to dramatically different electronic properties. One route to controlling structure is through stimulus-induced polymorph transitions, which allows for switching those electronic properties. However, despite advances in predicting crystal structures, the molecular design characteristics governing the polymorphic transition mechanism remains unknown. Here, we systematically investigate a series of n-type organic semiconductor molecules based on 2-dimensional quinoidal terthiophene with varying alkyl side chain lengths to modulate two distinct polymorph transitions, one cooperative martensitic transition and the other non-cooperative nucleation and growth transition. In the three molecular systems, we observe that shortening the alkyl chain past a critical length suppresses the cooperative polymorph transition by limiting the alkyl chain conformation change. On the other hand, the nucleation and growth transition temperature increases as the side chain length decreases, possibly driven by the increase in the melting point of the alkyl chains. We also found that tuning the alkyl chain length modulates the associated quinoidal to aromatic biradical switching that drives the nucleation and growth transition, suggesting a synergy between the crystal structure and electronic structure. Ultimately depending on the exact mechanism of the polymorph transition, adjusting the alkyl chain length may lead to tuning of the polymorph transition temperature or suppression of the transition altogether. This offers a potential molecular design rule to target a particular transition mechanism based on the desired behavior for the system.

Details

OriginalspracheEnglisch
Seiten (von - bis)719-728
Seitenumfang10
FachzeitschriftCrystal Growth and Design
Jahrgang23
Ausgabenummer2
PublikationsstatusVeröffentlicht - 13 Jan. 2023
Peer-Review-StatusJa

Externe IDs

WOS 000938625500001
unpaywall 10.1021/acs.cgd.2c00724

Schlagworte

Forschungsprofillinien der TU Dresden

Schlagwörter

  • Substitution, Conjugation, Mechanism, Oligomers, Packing, Length, Raman