Energy level alignment in CdS quantum dot sensitized solar cells using molecular dipoles

Menny Shalom, Sven Rühle, Idan Hod, Shay Yahav, Arie Zaban

Research output: Contribution to journalArticlepeer-review

174 Scopus citations

Abstract

(Figure Presented) The energy levels of CdS quantum dots (QDs) can be shifted in a systematic fashion with respect to the TiO2 bands using molecular dipoles. Dipole moments pointing toward the QD surface shift the energy levels toward the vacuum level (a), thus enabling electron injection from excited QD states into the TiO2 conduction band at lower photon energies compared to QDs with adsorbed molecular dipoles which are pointing away from the QD surface (b). In CdS QD sensitized solar cells this leads to a dipole dependent shift of the photovoltage onset and the photocurrent.

Original languageEnglish
Pages (from-to)9876-9877
Number of pages2
JournalJournal of the American Chemical Society
Volume131
Issue number29
DOIs
StatePublished - 29 Jul 2009

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