Linking microscale morphologies to localised performance in singlet fission quantum dot photon multiplier thin films

Daniel T.W. Toolan, Michael P. Weir, Simon Dowland, Jurjen F. Winkel, Jon R. Willmott, Zhilong Zhang, Victor Gray, James Xiao, Anthony J. Petty, John E. Anthony, Neil C. Greenham, Richard H. Friend, Akshay Rao, Richard A.L. Jones, Anthony J. Ryan

Research output: Contribution to journalArticlepeer-review

Abstract

Hybrid small-molecule/quantum dot films have the potential to reduce thermalization losses in single-junction photovoltaics as photon multiplication devices. Here grazing incidence X-ray scattering, optical microscopy and IR fluorescence microscopy (probing materials at two distinct wavelengths), provide new insight into highly complex morphologies across nm and μm lengthscales to provide direct links between morphologies and photon multiplication performance. Results show that within the small molecule crystallites three different QD morphologies may be identified; (i) large quantum dot aggregates at the crystallite nucleus, (ii) relatively well-dispersed quantum dots and (iii) as aggregated quantum dots “swept” from the growing crystallite and that regions containing aggregate quantum dot features lead to relatively poor photon multiplication performance. These results establish how combinations of scattering and microscopy may be employed to reveal new insights into the structure and function of small molecule:quantum dot blends.

Original languageEnglish
Pages (from-to)11192-11198
Number of pages7
JournalJournal of Materials Chemistry C
Volume10
Issue number31
DOIs
StatePublished - Jul 18 2022

Bibliographical note

Funding Information:
The authors acknowledge funding through the Engineering and Physical Sciences Research Council (UK) via grant numbers EP/P027814/1 and EP/P027741/1. J. X. acknowledges EPSRC Cambridge NanoDTC, EP/L015978/1 for financial support.

Publisher Copyright:
© 2022 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • Chemistry (all)
  • Materials Chemistry

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