Activation of CdSe Quantum Dots after Exposure to Polysulfide

Autor:	Weijie Zhao, Laurie A. King, D. Jason Riley, Lefteris Danos
Rok vydání:	2014
Předmět:	Photocurrent Inorganic chemistry Electrolyte Redshift Surfaces Coatings and Films Electronic Optical and Magnetic Materials Absorbance chemistry.chemical_compound General Energy chemistry Quantum dot Physical and Theoretical Chemistry Layer (electronics) Polysulfide Sodium sulfite
Zdroj:	The Journal of Physical Chemistry C. 118:14555-14561
ISSN:	1932-7455 1932-7447
DOI:	10.1021/jp412359d
Popis:	Polysulfide electrolyte is the most commonly utilized electrolyte in quantum dot-sensitized solar cells (QDSSCs). Recently, however, a redshift in the relative positions of the absorbance and incident photon conversion efficiencies of CdSe QDs in polysulfide solutions has been reported. We conduct extensive analyses of CdSe QD films comparing those exposed to polysulfide solution with unexposed films; indeed, a redshift in the absorbance is observed after exposure. Most strikingly, we observe that a photocurrent response from films immersed in sodium sulfite is observed only after exposure to polysulfide solution. We demonstrate this is due to a combination of both QD ripening and a change in the QD capping layer. The results demonstrate that a polysulfide processing step significantly alters the photoelectrochemical performance of QDs.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2a4dfeab61aa8ae4d7439d9b5005d310 https://doi.org/10.1021/jp412359d Zobrazit plný text záznamu