Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Activation of CdSe quantum dots after exposure to polysulfide
AU - King, Laurie A.
AU - Zhao, Weijie
AU - Danos, Lefteris
AU - Riley, D. Jason
PY - 2014
Y1 - 2014
N2 - 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 sulphite 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.
AB - 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 sulphite 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.
U2 - 10.1021/jp412359d
DO - 10.1021/jp412359d
M3 - Journal article
JO - The Journal of Physical Chemistry C
JF - The Journal of Physical Chemistry C
SN - 1932-7447
ER -