Injection of photoelectrons from colloidal CdSe quantum dots (QDs) capped by thioglycolic acid into compact ultrathin TiO 2 layers was investigated by direct detection of modulated charge separation with surface photovoltage spectroscopy. A size-dependent peak related to light absorption in the CdSe QDs and charge transfer to TiO 2 was observed for QDs of different sizes. Correlation between CdSe QDs absorption and photoelectron injection into TiO 2 has been demonstrated. Our results show that surface photovoltage spectroscopy is a valuable tool to determine the effectiveness of carrier injection from colloidal semiconductor QDs to electron transport materials in advanced solar cell configurations.
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Mora‐Seró et al. (2007) studied this question.
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