Enhanced
Photocurrent and Dynamic Response in Vertically Aligned In<sub>2</sub>S<sub>3</sub>/Ag Core/Shell Nanorod Array Photoconductive Devices
Hilal Cansizoglu
Mehmet
F. Cansizoglu
Fumiya Watanabe
Tansel Karabacak
10.1021/am501481w.s001
https://acs.figshare.com/articles/journal_contribution/Enhanced_Photocurrent_and_Dynamic_Response_in_Vertically_Aligned_In_sub_2_sub_S_sub_3_sub_Ag_Core_Shell_Nanorod_Array_Photoconductive_Devices/2283187
Enhanced photocurrent values were
achieved through a semiconductor-core/metal-shell nanorod array photoconductive
device geometry. Vertically aligned indium sulfide (In<sub>2</sub>S<sub>3</sub>) nanorods were formed as the core by using glancing
angle deposition technique (GLAD). A thin silver (Ag) layer is conformally
coated around nanorods as the metallic shell through a high pressure
sputter deposition method. This was followed by capping the nanorods
with a metallic blanket layer of Ag film by utilizing a new small
angle deposition technique combined with GLAD. Radial interface that
was formed by the core/shell geometry provided an efficient charge
carrier collection by shortening carrier transit times, which led
to a superior photocurrent and gain. Thin metal shells around nanorods
acted as a passivation layer to decrease surface states that cause
prolonged carrier lifetimes and slow recovery of the photocurrent
in nanorods. A combination of efficient carrier collection with surface
passivation resulted in enhanced photocurrent and dynamic response
at the same time in one device structure. In<sub>2</sub>S<sub>3</sub> nanorod devices without the metal shell and with relatively thicker
metal shell were also fabricated and characterized for comparison.
In<sub>2</sub>S<sub>3</sub> nanorods with thin metal shell showed
the highest photosensitivity (photocurrent/dark current) response
compared to two other designs. Microstructural, morphological, and
electronic properties of the core/shell nanorods were used to explain
the results observed.
2014-06-11 00:00:00
Thin metal shells
decrease surface states
charge carrier collection
angle deposition technique
carrier transit times
GLAD
2S nanorods
2S nanorod devices
photocurrent
metal shell