View : 29 Download: 0

Large Surface Photovoltage of WS2/MoS2 and MoS2/WS2 Vertical Hetero-bilayers

Title
Large Surface Photovoltage of WS2/MoS2 and MoS2/WS2 Vertical Hetero-bilayers
Authors
Kim, BoraKim, JayeongTsai, Po-ChengChoi, HyejiYoon, SeokhyunLin, Shih-YenKim, Dong-Wook
Ewha Authors
윤석현김동욱
SCOPUS Author ID
윤석현scopus; 김동욱scopus
Issue Date
2021
Journal Title
ACS APPLIED ELECTRONIC MATERIALS
ISSN
2637-6113JCR Link
Citation
ACS APPLIED ELECTRONIC MATERIALS vol. 3, no. 6, pp. 2601 - 2606
Keywords
surface photovoltageMoS2WS2hetero-bilayeropen-circuit voltage
Publisher
AMER CHEMICAL SOC
Indexed
SCIE; SCOPUS WOS
Document Type
Article
Abstract
Hetero-bilayers, composed of transition metal dichalcogenide (TMD) monolayers of MoS2(1L-MoS2) and 1L-WS2, are grown on Al2O3 substrates through sulfurization of predeposited metal thin films. A very smooth surface morphology and the uniform contact potential difference (CPD) maps show that high-quality homogeneous TMD layers are obtained. The light-induced CPD change, that is, surface photovoltage (SPV), of the samples is investigated. A record high SPV is measured under 532 nm illumination with a power density of 13 mW/cm(2) from the hetero-bilayers, with values of 800 mV for 1L-WS2/1L-MoS2 and -790 mV for 1L-MoS2/1L-WS2. Band diagrams are proposed to explain the observed CPD and SPV characteristics. The power dependence of the SPV demonstrates that the measured values represent the expected open-circuit voltage of the hetero-bilayers. The obtained results suggest that optimal growth and proper contact formation with the TMD vertical hetero-bilayers will enable high-efficiency ultrathin photovoltaic devices.
DOI
10.1021/acsaelm.1c00192
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE