Large Voltage Generation of Flexible Thermoelectric Nanocrystal Thin Films by Finger Contact

Jinyong Choi, Kyoungah Cho, Junggwon Yun, Yoonbeom Park, Seunggen Yang, Sangsig Kim

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


This paper demonstrates that thermal energy radiated from a human finger can be converted efficiently into electricity by a nanocrystal (NC) thin film that substantially suppresses thermal conduction, but still allows electric conduction. The converting efficiencies of the chalcogenide NC thin films with dimensions 40 μm × 20 μm × 20 nm, prepared on flexible substrates by a solution process, are maximized by adjusting the NC size. A Seebeck coefficient of S = 1829 μV K-1, and a dimensionless thermoelectric figure-of-merit, ZT = 0.68 are achieved at ambient temperature for p- and n-type NC thin films, respectively. A thermoelectric array consisting of p- and n-type NC thin films generates a voltage of 645 mV for a temperature gradient of 10 K. Furthermore, the donut-shaped pn array can generate a voltage of 170 mV from the heat supplied by an individual's finger.

Original languageEnglish
JournalAdvanced Energy Materials
Publication statusAccepted/In press - 2017


  • Flexible
  • Nanocrystal thin films
  • Power generation
  • Solution-processable
  • Thermoelectric modules

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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