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Efficient, stable infrared photovoltaics based on solution-cast colloidal quantum dots

Koleilat, Ghada I. and Levina, Larissa and Shukla, Harnik and Myrskog, Stefan H. and Hinds, Sean and Pattantyus-Abraham, Andras G. and Sargent, Edward H. (2008) Efficient, stable infrared photovoltaics based on solution-cast colloidal quantum dots. ACS NANO, 2 (5). pp. 833-840.

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Half of the sun's power lies in the infrared. As a result, the optimal bandgaps for solar cells in both the single-junction and even the tandem architectures lie beyond 850 nm. However, progress in low-cost, large-area, physically flexible solar cells has instead been made in organic and polymer materials possessing absorption onsets in the visible. Recent advances have been achieved in solution-cast infrared photovoltalics through the use of colloidal quantum dots. Here we report stable solution-processed photovoltaic devices having 3.6% power conversion efficiency in the infrared. The use of a strongly bound bidentate linker, benzenedithiol, ensures device stability over weeks. The devices reach external quantum efficiencies of 46% in the infrared and 70% across the visible. We investigate in detail the physical mechanisms underlying the operation of this class of device. In contrast with drift-dominated behavior in recent reports of PbS quantum dot photovoltaics, we find that diffusion of electrons and holes over hundreds of nanometers through our PbSe colloidal quantum dot solid is chiefly responsible for the high external quantum efficiencies obtained in this new class of devices.

Item Type:Article
Uncontrolled Keywords:infrared photovoltaics; PbSe nanocrystals; benzenedithiol linker; rectifying junction; carrier transport
Subjects:Material Science > Functional and hybrid materials
Physical Science > Nanophysics
Technology > Nanotechnology and energy applications
Physical Science > Quantum phenomena
Physical Science > Photonics
ID Code:482
Deposited On:04 Dec 2008 15:01
Last Modified:05 Jan 2009 17:26

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