Bismuth Oxyhalide based Photo-enhanced Triboelectric Nanogenerators

Zidong Yu, Han Yang, Navneet Soin, liming chen, nathan black, ke xu, Preetam Sharma, Christos Tsonos, Amit Kumar, Jikui Luo

Research output: Contribution to journalArticlepeer-review


Utilizing wide absorption characteristics of a narrow bandgap (~1.8 eV) semiconductor, we report on Bismuth Oxyiodide (BiOI) based photo-enhanced triboelectric nanogenerator (TENG). The potentiostatic deposition of tribo-positive BiOI on transparent, electrically conducting Fluorine doped Indium Tin Oxide (FTO) substrates provides a pathway to exploit concurrently the photo-enhanced charge generation and triboelectric effects. When utilized against tribo-negative polydimethylsiloxane (PDMS) films, under illumination, the BiOI/PDMS TENGs’ output was significantly enhanced, wherein an increase of 21% in output voltage, 38% in charge density (26% in short-circuit current density), and 74% in overall power density (from 0.25 W m-2 (in dark) and 0.44 W m-2 (under illumination)), respectively, was observed. Correspondingly, a dramatic enhancement (from ~25 mV to ~300 mV) in the average surface potential, termed as surface photovoltage (SPV), for the illuminated BiOI was observed by Kelvin Probe Force Microscopy (KPFM). For an isolated, grounded BiOI/FTO electrode, this enhanced SPV was slow-decaying (~3.5 h) and is attributed to the high dielectric constant, presence of deep surface states, and traps within BiOI, and slow charge-exchange with the ambient environment. The work thus not only provides an approach for the enhancement of mechanical-to-electrical efficiency of TENGs by light absorption but can also be utilized for self-powered detection of electromagnetic radiation and photodetectors.
Original languageEnglish
Article number106419
Pages (from-to)1-14
Number of pages14
JournalNano Energy
Issue numberPart B
Early online date11 Aug 2021
Publication statusPublished - 30 Nov 2021


  • Bismuth oxyiodide
  • Triboelectric nanogenerators
  • Photo-stimulation
  • Surface photovoltage
  • KPFM


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