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Nanoporous Si – Organic Composite Photovoltaics

Published online by Cambridge University Press:  01 February 2011

I. A. Levitsky ,
W. B. Euler ,
N. Tokranova ,
B. Xu  and
J. Castracane
I. A. Levitsky
Affiliation:
Emitech, Inc., Fall River, Massachusetts 02720, U.S.A.
W. B. Euler
Affiliation:
Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, U.S.A.
N. Tokranova
Affiliation:
College of Nanoscale Science and Engineering, University at Albany (SUNY), New York 12203, U.S.A.
B. Xu
Affiliation:
College of Nanoscale Science and Engineering, University at Albany (SUNY), New York 12203, U.S.A.
J. Castracane
Affiliation:
College of Nanoscale Science and Engineering, University at Albany (SUNY), New York 12203, U.S.A.
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Abstract

We report novel composite photovoltaics fabricated from nanoporous Si filled with Copper Phthalocyanine (CuPC) and its derivatives, including discotic liquid crystal CuPC. Porous n-type Si (PSi) was prepared electrochemically (pore size 10–20 nm) and filled with CuPC solution by impregnation under pressure or spin casting (liquid crystal CuPC) onto a porous surface followed by heating to the temperature of the mesophase transition. For porous layer with the thickness more than 1500–2000 nm, the conversion efficiency was up to 3% under a tungsten lamp with solar filters (30 mW/cm2). The porous structure and pore filling were examined by SEM and XPS techniques. Photocurrent spectra of the CuPC-PSi cell demonstrate two bands that correspond to the absorbance of the protonated form of CuPC. A comparative analysis between CuPC and liquid crystal CuPC has been made and conclusions about possible mechanisms of charge transfer and transport are drawn. The solar cell optimization is discussed as well.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 836: Symposium L – Materials for Photovoltaics , 2004 , L2.10
Copyright
Copyright © Materials Research Society 2005

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References

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