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Proceedings Paper

Hybrid photovoltaic junctions: metal/molecular organic insulator/semiconductor MOIS solar cells
Author(s): Rotem Har-Lavan; Izhar Ron; Florent Thieblemont; David Cahen
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Paper Abstract

Using a dense organic monolayer, self-assembled and directly bound to n-Si, as high quality insulator with a thickness that can be varied from 1.5-2.5 nm, we construct a Metal-Organic Insulator-Semiconductor (MOIS) structure, which, if fabricated with semi-transparent top electrode, performs as a hybrid organic-inorganic photovoltaic device. The feasibility of the concept and the electrical properties of the insulating layer were first shown with a Hg top electrode, allowing use of prior know-how from electron transport through molecular monolayers, but with photon collection only from around the electrode. We then used another bottom-up fabrication technique, in addition to molecular self-assembly, electro-less metal deposition, to implement an all-covalently bound solid state device. Electro-less Au deposition yields an electrically continuous, porous and semi-transparent top electrode, improving photon harvesting. Aside from being a nearly ideal insulator, the monolayer acts to passivate and protect the interfacial Si layer from defects and to decrease the surface state density. In addition the cell, like any MIS solar cell, benefits from that the light needs only to cross a few thin transparent layers (anti-reflective coating, organic insulator) to reach the photovoltaically active cell part. This helps to generate carriers close to the junction area, even by short wavelength photons, and, thus, to increase light collection, compared to p-n junction solar cells. Due to low temperature cell fabrication without high vacuum steps, the MOIS approach might be interesting for low cost solar cells.

Paper Details

Date Published: 5 May 2008
PDF: 10 pages
Proc. SPIE 7002, Photonics for Solar Energy Systems II, 70020M (5 May 2008); doi: 10.1117/12.768652
Show Author Affiliations
Rotem Har-Lavan, Weizmann Institute of Science (Israel)
Izhar Ron, Weizmann Institute of Science (Israel)
Florent Thieblemont, Weizmann Institute of Science (Israel)
David Cahen, Weizmann Institute of Science (Israel)

Published in SPIE Proceedings Vol. 7002:
Photonics for Solar Energy Systems II
Andreas Gombert, Editor(s)

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