Contact printing of compositionally graded CdS(x)Se(1-x) nanowire parallel arrays for tunable photodetectors.
Spatially composition-graded CdS(x)Se(1-x) (x = 0-1) nanowires are grown and transferred as parallel arrays onto Si/SiO(2) substrates by a one-step, directional contact printing process. Upon subsequent device fabrication, an array of tunable-wavelength photodetectors is demonstrated. From the spectral photoconductivity measurements, the cutoff wavelength for the device array, as determined by the bandgap, is shown to cover a significant portion of the visible spectrum. The ability to transfer a collection of crystalline semiconductor nanowires while preserving the spatially graded composition may enable a wide range of applications, such as tunable lasers and photodetectors, efficient photovoltaics, and multiplexed chemical sensors.
Department of Electrical Engineering and Computer Sciences, University of California at Berkeley, Berkeley, CA 94720, USA.
Toshitake
T
Takahashi
Patricia
P
Nichols
Kuniharu
K
Takei
Alexandra C
AC
Ford
Arash
A
Jamshidi
Ming C
MC
Wu
C Z
CZ
Ning
Ali
A
Javey