Heterojunction solar cells were formed with a position-controlled InP nanowire array sputtered with indium tin oxide (ITO). The ITO not only acted as a transparent electrode but also as forming a photovoltaic junction. The devices exhibited an open-circuit voltage of 0.436 V, short-circuit current of 24.8 mA/cm(2), and fill factor of 0.682, giving a power conversion efficiency of 7.37% under AM1.5G illumination. The internal quantum efficiency of the device was higher than that of the world-record InP cell in the short wavelength range. (C) 2013 AIP Publishing LLC.
Copyright 2013 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Appl. Phys. Lett. 103, 243111(2013) and may be found at http://scitation.aip.org/content/aip/journal/apl/103/24/10.1063/1.4847355/