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Factors determining the photovoltaic performance of a CdSe quantum dot sensitized solar cell: the role of the linker molecule and of the counter electrode

Mora-Sero, Ivan and Gimenez, Sixto and Moehl, Thomas and Fabregat-Santiago, Francisco and Lana-Villareal, Teresa and Gomez, Roberto and Bisquert, Juan (2008) Factors determining the photovoltaic performance of a CdSe quantum dot sensitized solar cell: the role of the linker molecule and of the counter electrode. NANOTECHNOLOGY, 19 (42).

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Official URL: http://dx.doi.org/10.1088/0957-4484/19/42/424007

Abstract

Colloidal CdSe quantum dots (QDs) of different sizes, prepared by a solvothermal route, have been employed as sensitizers of nanostructured TiO2 electrode based solar cells. Three different bifunctional linker molecules have been used to attach colloidal QDs to the TiO2 surface: mercaptopropionic acid (MPA), thioglycolic acid (TGA), and cysteine. The linker molecule plays a determinant role in the solar cell performance, as illustrated by the fact that the incident photon to charge carrier generation efficiency (IPCE) could be improved by a factor of 5-6 by using cysteine with respect to MPA. The photovoltaic properties of QD sensitized electrodes have been characterized for both three-electrode and closed two-electrode solar cell configurations. For three-electrode measurement a maximum power conversion efficiency near 1% can be deduced, but this efficiency is halved in the closed cell configuration mainly due to the decrease of the fill factor (FF).

Item Type:Article
Subjects:Technology > Nanotechnology and energy applications
Material Science > Nanostructured materials
ID Code:1922
Deposited By:Farnush Anwar
Deposited On:16 Dec 2008 15:57
Last Modified:12 Jan 2009 11:06

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