title: Photovoltaic response of a topotaxially formed CdS-Cu(x)S single nanorod heterojunction.
abstract: In the present study, a combination of a hydrothermal route and a topotaxial conversion reaction has been used to grow a cadmium sulfide-copper sulfide (CdS-Cu(x)S) single nanorod heterojunction. The J-V characteristics of the CdS nanorods show Shockley behaviour consistent with the energy band diagram of the platinum conducting atomic force microscope (CAFM) probe-CdS nanorod combination. The photovoltaic response measured on the CdS-Cu(x)S nanorods using a CAFM probe shows the formation of a heterojunction with an open circuit voltage of 320 mV, a short circuit current density of 5.5 mA cm⁻² and a crossover of dark and light J-V curves related to the photoconductivity of the interfacial CdS layer. The lengthwise heterojunction fabricated in the present study has many potential advantages in comparison to other single nanorod junctions.
authors.affiliation: Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India. brmehta@physics.iitd.ernet.in
authors.forename: B R
authors.initials: BR
authors.lastname: Mehta
authors.forename: Saatviki
authors.initials: S
authors.lastname: Gupta
authors.forename: V N
authors.initials: VN
authors.lastname: Singh
authors.forename: Prashant
authors.initials: P
authors.lastname: Tripathi
authors.forename: Deepak
authors.initials: D
authors.lastname: Varandani