A photovoltaic device structure based on internal electron emission

Eric W. McFarland () and Jing Tang
Additional contact information
Eric W. McFarland: University of California
Jing Tang: University of California

Nature, 2003, vol. 421, issue 6923, 616-618

Abstract: Abstract There has been an active search for cost-effective photovoltaic devices since the development of the first solar cells in the 1950s (refs 1–3). In conventional solid-state solar cells, electron–hole pairs are created by light absorption in a semiconductor, with charge separation and collection accomplished under the influence of electric fields within the semiconductor. Here we report a multilayer photovoltaic device structure in which photon absorption instead occurs in photoreceptors deposited on the surface of an ultrathin metal–semiconductor junction Schottky diode. Photoexcited electrons are transferred to the metal and travel ballistically to—and over—the Schottky barrier, so providing the photocurrent output. Low-energy (∼1 eV) electrons have surprisingly long ballistic path lengths in noble metals4,5, allowing a large fraction of the electrons to be collected. Unlike conventional cells, the semiconductor in this device serves only for majority charge transport and separation. Devices fabricated using a fluorescein photoreceptor on an Au/TiO2/Ti multilayer structure had typical open-circuit photovoltages of 600–800 mV and short-circuit photocurrents of 10–18 µA cm-2 under 100 mW cm-2 visible band illumination: the internal quantum efficiency (electrons measured per photon absorbed) was 10 per cent. This alternative approach to photovoltaic energy conversion might provide the basis for durable low-cost solar cells using a variety of materials.

Date: 2003
References: Add references at CitEc
Citations: View citations in EconPapers (3)

Downloads: (external link)
https://www.nature.com/articles/nature01316 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:421:y:2003:i:6923:d:10.1038_nature01316

Ordering information: This journal article can be ordered from
https://www.nature.com/

DOI: 10.1038/nature01316

Access Statistics for this article

Nature is currently edited by Magdalena Skipper

More articles in Nature from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().