Interfacial dynamic surface traps of lead sulfide (PbS) nanocrystals: testplatform for interfacial charge carrier traps at the organic/inorganic functional interface
- Interfacial dynamic surface traps of lead sulfide (PbS) nanocrystals: testplatform for interfacial charge carrier traps at the organic/inorganic functional interface
- 고형덕; 김영준; 박병남
- Issue Date
- Journal of physics D, applied physics
- VOL 51, NO 14, 145306
- Nanocrystal (NC) size and ligand dependent dynamic trap formation of lead sulfide (PbS) NCs
in contact with an organic semiconductor were investigated using a pentacene/PbS field effect transistor (FET). We used a bilayer pentacene/PbS FET to extract information of the surface
traps of PbS NCs at the pentacene/PbS interface through the field effect-induced charge carrier density measurement in the threshold and subthreshold regions. PbS size and ligand dependent trap properties were elucidated by the time domain and threshold voltage measurements in which threshold voltage shift occurs by carrier charging and discharging in the trap states of PbS NCs. The observed threshold voltage shift is interpreted in context of electron trapping through dynamic trap formation associated with PbS NCs. To the best of our knowledge, this is the first demonstration of the presence of interfacial dynamic trap density of PbS NC in
contact with an organic semiconductor (pentacene). We found that the dynamic trap density of the PbS NC is size dependent and the carrier residence time in the specific trap sites is more sensitive to NC size variation than to NC ligand exchange. The probing method presented in
the study offers a means to investigate the interfacial surface traps at the organic-inorganic
hetero-junction, otherwise understanding of the buried surface traps at the functional interface would be elusive.
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