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Active and Passive Electronic Components
Volume 13 (1988), Issue 1, Pages 33-43

A 22% Efficient Semiconductor/Liquid Junction Solar Cell—the Photoelectrochemical Behavior of n-WSe2 Electrodes in the Presence of I2/I- in Aqueous Electrolyte

1Laboratoire de Chimie du Solide du CNRS, 351 cours de la Libération, Talence Cedex, 33405, France
2Institut de Physique Appliquée, Ecole Polytechnique Fédérale, Lausanne CH-1015, Switzerland

Received 24 July 1986; Accepted 15 November 1986

Copyright © 1988 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


One of the most efficient semiconductor/liquid-junction photoelectrochemical cells (PEC) reported to date is presented. It consists of a SeCl4-grown n-WSe2 single crystal anode, with a 3.1016 cm-3 conduction-band electronic density, and a platinum cathode. Both electrodes are immersed in a 2M KI + 0.005M I2 aqueous electrolyte. The calculations of the main physical parameters determining the high value (22%) of the visible light-to-electrical energy conversion efficiency have been carried out. We particularly show that the lifetime of the photogenerated holes is larger than their transit time across the space-charge so that the carriers reach the semiconductor surface, where they can react with the electrolyte, without recombining.