Surface states and photovoltaic effects in CdSe quantum dot films

L. Kronik*, N. Ashkenasy, M. Leibovitch, E. Fefer, Yoram Shapira, S. Gorer, G. Hodes

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Photovoltaic effects in CdSe quantum dot (QD) films have been studied using surface photovoltage spectroscopy and complementary methods. The results show that, contrary to previous studies, nonnegligible electric fields can exist in QD films. As a result, driftlike currents must be considered, in addition to the well-known diffusionlike currents. However, it is found that the specific case of photovoltage sign reversal, observed after etching highly quantized CdSe QD films, is governed by diffusionlike transport. The latter is highly influenced by preferential trapping of one type of charge carrier. The preferential trapping is shown to be surface localized and is strongly ambient dependent. It is shown that the photovoltaic properties of these CdSe QD films are dominated by their surface state distribution.

Original languageEnglish
Pages (from-to)1748-1755
Number of pages8
JournalJournal of the Electrochemical Society
Volume145
Issue number5
DOIs
StatePublished - May 1998

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