Nano Archive

CdSe quantum dot-sensitized solar cells exceeding efficiency 1% at full-sun intensity

Lee, Hyo Joong and Yum, Jun-Ho and Leventis, Henry C. and Zakeeruddin, Shaik M. and Haque, Saif A. and Chen, Peter and Seok, Sang Il and Graetzel, Michael and Nazeeruddin, Md. K. (2008) CdSe quantum dot-sensitized solar cells exceeding efficiency 1% at full-sun intensity. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (30). pp. 11600-11608.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp802572b

Abstract

Colloidal cadmium selenide (CdSe) quantum dots QDs) have been prepared and exploited as inorganic dyes to sensitize a large-band-gap TiO2 layer for QD-sensitized solar cells. The optimized QD-sensitized solar cells exhibited an unprecedented incident photon-to-charge carrier generation efficiency of 36% and an overall conversion efficiency of over 1.7% at 0.1 sun and 1% at full sun intensity with a cobalt(II/III)-based redox system. The photovoltaic characteristics of CdSe QD-sensitized cells are compared with standard dye-sensitized solar cells, in which the former exhibited about half of the efficiency of the latter. From the kinetics of charge transfer monitored using transient spectroscopic and voltage decay measurements in the CdSe QD-sensitized cell, the regeneration yield of oxidized QDs was found to be close to almost unity, and the electron lifetime was longer in the CdSe QD-sensitized cell than in the dye-sensitized solar cell.

Item Type:Article
Subjects:Material Science > Functional and hybrid materials
Technology > Nanotechnology and energy applications
ID Code:1448
Deposited By:Farnush Anwar
Deposited On:12 Dec 2008 14:44
Last Modified:13 Jan 2009 16:38

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