Photocurrent method for characterizing the interface of hydrophobically bonded Si wafers

Tommi Suni, Kimmo Henttinen, Ilkka Suni, L.S. Yu, P. Mages, D. Qiao, L. Jia, P.K.L. Yu, S.S. Lau

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)


We report a simple and nondestructive photocurrent method for characterizing the bonding interface between two hydrophobically bonded Si wafers. The relationship of photocurrent versus wavelength was measured and analyzed. The direction of the photocurrent indicates the band-bending direction, and thus, the donor or acceptor nature of the interface states. The photocurrent is proportional to the electric field at the interface induced by band bending. Our results showed that the Si pairs bonded in air have much larger band bending at the interface than those bonded in dry nitrogen, and that both have donor-like interface states.
Original languageEnglish
Pages (from-to)916-918
JournalApplied Physics Letters
Issue number6
Publication statusPublished - 2003
MoE publication typeA1 Journal article-refereed


  • silicon
  • elemental semiconductors
  • wafer bonding
  • photoconductivity
  • interface states
  • band structure
  • semiconductor device measurement


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