title: Mo1-xWxSe2-Based Schottky Junction Photovoltaic Cells.
abstract: We developed Schottky junction photovoltaic cells based on multilayer Mo1-xWxSe2with x = 0, 0.5, and 1. To generate built-in potentials, Pd and Al were used as the source and drain electrodes in a lateral structure, and Pd and graphene were used as the bottom and top electrodes in a vertical structure. These devices exhibited gate-tunable diode-like current rectification and photovoltaic responses. Mo0.5W0.5Se2Schottky diodes with Pd and Al electrodes exhibited higher photovoltaic efficiency than MoSe2and WSe2devices with Pd and Al electrodes, likely because of the greater adjusted band alignment in Mo0.5W0.5Se2devices. Furthermore, we showed that Mo0.5W0.5Se2-based vertical Schottky diodes yield a power conversion efficiency of ∼16% under 532 nm light and ∼13% under a standard air mass 1.5 spectrum, demonstrating their remarkable potential for photovoltaic applications.
authors.affiliation: Department of Physics, Yonsei University , 50 Yonsei-ro, Seoul 03722, Republic of Korea.
authors.forename: Sum-Gyun
authors.initials: SG
authors.lastname: Yi
authors.affiliation: Department of Physics, Yonsei University , 50 Yonsei-ro, Seoul 03722, Republic of Korea.
authors.forename: Sung Hyun
authors.initials: SH
authors.lastname: Kim
authors.affiliation: Department of Physics, Yonsei University , 50 Yonsei-ro, Seoul 03722, Republic of Korea.
authors.forename: Sungjin
authors.initials: S
authors.lastname: Park
authors.affiliation: Department of Physics, Yonsei University , 50 Yonsei-ro, Seoul 03722, Republic of Korea.
authors.forename: Donggun
authors.initials: D
authors.lastname: Oh
authors.affiliation: Department of Physics, Yonsei University , 50 Yonsei-ro, Seoul 03722, Republic of Korea.
authors.forename: Hwan Young
authors.initials: HY
authors.lastname: Choi
authors.affiliation: Department of Physics, Yonsei University , 50 Yonsei-ro, Seoul 03722, Republic of Korea.
authors.forename: Nara
authors.initials: N
authors.lastname: Lee
authors.affiliation: Department of Physics, Yonsei University , 50 Yonsei-ro, Seoul 03722, Republic of Korea.
authors.forename: Young Jai
authors.initials: YJ
authors.lastname: Choi
authors.affiliation: Department of Physics, Yonsei University , 50 Yonsei-ro, Seoul 03722, Republic of Korea.
authors.forename: Kyung-Hwa
authors.initials: KH
authors.lastname: Yoo
keywords: Mo1−xWxSe2 alloys; Schottky junction; graphene electrode; photovoltaic cells; scanning photocurrent mapping