The photovoltaic properties of the ZnO/CdTe core-shell NW arrays when covered with the CuSCN/Au back-side contact are strongly improved after the CdCl2 heat treatment but remain low. It is expected that the main limitation originates from the poor collection of the holes generated in the CdTe shell from the CuSCN/Au back-side contact. Eventually, the CdCl2 heat treatment should systematically

be achieved for the fabrication of solar cells made from ZnO/CdTe core-shell NW arrays. Acknowledgements The authors are grateful to B. Gayral, CEA-INAC, Grenoble, France, for his assistance Hedgehog antagonist in PL measurements. This work has been supported by the Nanosciences Foundation of Grenoble through the project II-VI Photovoltaic and by Grenoble INP with a Bonus Qualité Recherche grant through the project CELESTE. This work has also been partially supported by the Spanish Ministry under contract MAT2010-16116. References 1. Law M, Goldberger J, Yang P: Semiconductor nanowires

and nanotubes. Annu Rev Mater Res 2004, 34:83.CrossRef DNA/RNA Synthesis inhibitor 2. Garnett EC, Brongersma ML, Cui Y, McGehee MD: Nanowire solar cells. Annu Rev Mater Res 2011, 41:269.CrossRef 3. Özgür Ü, Alivov YI, Liu C, Teke A, Reshchikov MA, Doğan S, Avrutin V, Cho SJ, Morkoç H: A comprehensive review of ZnO materials and devices. J Appl Phys 2005, 98:041301.CrossRef 4. Schmidt-Mende L, MacManus-Driscoll JL: ZnO-nanostructures, defects, and devices. Materials Today 2007, 10:40.CrossRef 5. Wu JJ, Liu SC: Low-temperature

growth of well-aligned ZnO nanorods by chemical vapor deposition. Adv Mater 2002, 14:215–218.CrossRef 6. Park WI, Kim DH, Jung SW, Yi GC: Metal-organic vapor phase epitaxial growth of vertically well-aligned ZnO nanorods. Appl Phys Lett 2002, 80:4232–4234.CrossRef C59 clinical trial 7. Zheng MJ, Zhang LD, Li GH, Shen WZ: Fabrication and optical properties of large-scale uniform zinc oxide nanowire arrays by one-step electrochemical deposition technique. Chem Phys Lett 2002, 363:123–128.CrossRef 8. Vayssieres L, Keis K, Lindquist SE, Hagfeldt A: Purpose-built anisotropic metal oxide material: 3D highly oriented microrod array of ZnO. J Phys Chem B 2001, 105:3350–3352.CrossRef 9. Yamabi S, Imai H: Growth conditions for wurtzite zinc oxide films in aqueous solutions. J Mater Chem 2002, 12:3773–3778.CrossRef 10. Baxter JB, Aydill ES: Nanowire-based dye-sensitized solar cells. Appl Phys Lett 2005, 86:053114.CrossRef 11. Puyoo E, Rey G, Appert E, Consonni V, Bellet D: Efficient dye-sensitized solar cells made from ZnO nanostructure composites. J Phys Chem C 2012, 116:18117.CrossRef 12. Lévy-Clément C, Tena-Zaera R, Ryan MA, Katty A, Hodes G: CdSe-sensitized p-CuSCN/nanowire n-ZnO heterojunctions. Adv Mater 2005, 17:1512.CrossRef 13.