Defect-Dominated Charge Transport in Si-Supported CdSe Nanoparticle Films

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• 作者：Shaibal K. Sarkar ; Gary Hodes ; Leeor Kronik ; Hagai Cohen
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：April 24, 2008
• 年：2008
• 卷：112
• 期：16
• 页码：6564 - 6570
• 全文大小：120K
• 年卷期：v.112,no.16(April 24, 2008)
• ISSN：1932-7455

文摘

Investigations of charge transport mechanisms in thin CdSe nanoparticles films deposited on silicon, usingsurface photovoltage and chemically resolved electrical measurements, reveal a strongly nonlinear opticalresponse and a negative differential resistance. Here, both phenomena are rationalized within a phenomenological model consisting of two spatially separated types of traps, one related to the CdSe nanoparticles and theother to the nanoparticle/substrate interface. The model successfully explains a broad range of both old andnew experimental observations and is used as a numerical framework for showing how the interplay betweenhole and electron processes dominates the photoelectrical properties of nanoparticle films.