High electron mobility of β-HgS colloidal quantum dots with doubly occupied quantum states

Jaekyun Kim, Bitna Yoon, Jaehyun Kim, Yunchang Choi, Young Wan Kwon, Sung Kyu Park, Kwang Seob Jeong

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Electron occupation of the lowest electronic state of the conduction band (1Se) of a semiconducting nanocrystal offers numerous opportunities to efficiently utilize the quantization of the colloidal quantum dot. The steady-state electron occupation of the 1Se gives rise to unprecedented electrical, optical, and magnetic properties. We report an electron mobility of ∼1.29 cm2 V-1 s-1 measured in a mercury sulfide (β-HgS) quantum dot field effect transistor (FET), demonstrating the best carrier mobility for the HgS colloidal nanocrystal solid. The high electron mobility of the HgS nanocrystals with the doubly occupied quantum state originates from the efficient ligand exchange from oleylamine to thiocyanate, better carrier hopping via shortened inter-dot-distance, and the packing of nanocrystals by optimized thermal annealing conditions.

Original languageEnglish
Pages (from-to)38166-38170
Number of pages5
JournalRSC Advances
Volume7
Issue number61
DOIs
Publication statusPublished - 2017

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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