Conformal core-shell nanostructured photodetectors with enhanced photoresponsivity by high pressure sputter deposition
- PDF / 776,388 Bytes
- 7 Pages / 612 x 792 pts (letter) Page_size
- 87 Downloads / 151 Views
Advances:
Email alerts: Click here Subscriptions: Click here Commercial reprints: Click here Terms of use : Click here
Conformal core-shell nanostructured photodetectors with enhanced photoresponsivity by high pressure sputter deposition Filiz Keles, Hilal Cansizoglu, Matthew Brozak, Emad Badraddin and Tansel Karabacak MRS Advances / FirstView Article / July 2016, pp 1 - 6 DOI: 10.1557/adv.2016.317, Published online: 10 May 2016
Link to this article: http://journals.cambridge.org/abstract_S2059852116003170 How to cite this article: Filiz Keles, Hilal Cansizoglu, Matthew Brozak, Emad Badraddin and Tansel Karabacak Conformal core-shell nanostructured photodetectors with enhanced photoresponsivity by high pressure sputter deposition. MRS Advances, Available on CJO 2016 doi:10.1557/adv.2016.317 Request Permissions : Click here
Downloaded from http://journals.cambridge.org/ADV, IP address: 132.77.150.148 on 12 Jul 2016
MRS Advances © 2016 Materials Research Society DOI: 10.1557/adv.2016.317
Conformal core-shell nanostructured photodetectors with enhanced photoresponsivity by high pressure sputter deposition
Filiz Keles,1 Hilal Cansizoglu,1 Matthew Brozak,1 Emad Badraddin,1 Tansel Karabacak1 1
Department of Physics and Astronomy, University of Arkansas at Little Rock, Little Rock, Arkansas 72204, United States
ABSTRACT Working gas pressure during sputter deposition can significantly affect the conformality of a thin film when it is grown on a nanostructured surface. In this study, we fabricated coreshell nanostructured photodetectors, where n-type In2S3 nanorod arrays (core) were coated with p-type CuInS2 (CIS) films (shell) at relatively low and high Ar gas pressures. In2S3 nanorods were prepared by glancing angle deposition (GLAD) technique using a thermal evaporator unit. -2 CIS films were deposited by RF sputtering at Ar pressures of 2.7x10 mbar (high pressure -3 sputtering, HIPS) and 7.3x10 mbar (low pressure sputtering, LPS). The morphological characterization was carried out by means of SEM. The photocurrent measurement was conducted under 1.5 AM Sun under no bias. Nanostructured photodetectors of HIPSCIS/GLAD-In2S3 (i.e. HIPS-GLAD) were shown to demonstrate enhanced photoresponse with a photocurrent value of 98 μA, which is about ~230% higher than that of LPS-GLAD devices. The enhancement originates from the improved core-shell structure achieved by more conformal coating of the CIS shell. In addition, the results were compared to their counterpart thin-film devices incorporating an In2S3 film coated either with HIPS or LPS CIS layer. Nanorod devices with high and low pressure CIS films showed photocurrent values ~20 times and ~ 19 times higher compared to those of high and low pressure film devices, respectively. This finding can be explained by the higher light absorption property of nanorods, and the reduced inter-electrode distance as a result of core-shell structure, which allows the effective capture of the photogenerated carriers. Therefore, the results of this work can pave way to the developmen
Data Loading...
