title: High-sensitivity photovoltaic responses in manganite-based heterojunctions on Si substrates for weak light detection.
abstract: We have fabricated and characterized a weak light photodetector in a heterojunction composed of manganite La0.4Ca0.6MnO3 and n-type Si. High-sensitivity photoresponse properties were investigated. The responsivities of open-circuit photovoltage and short-circuit photocurrent reach ∼1000  V/mJ and ∼30  A/mJ, respectively, without any amplification bias under irradiation by 20-ps-wide and 355, 532, and 1064-nm-wavelength laser pulses in nanojoule to microjoule order. The present results demonstrate that the manganite-based heterojunction on Si substrate has potential applications in weak light detection from ultraviolet to near-infrared light.
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China.
authors.forename: S S
authors.initials: SS
authors.lastname: Zhao
authors.forename: H
authors.initials: H
authors.lastname: Ni
authors.forename: K
authors.initials: K
authors.lastname: Zhao
authors.forename: S Q
authors.initials: SQ
authors.lastname: Zhao
authors.forename: Y C
authors.initials: YC
authors.lastname: Kong
authors.forename: H K
authors.initials: HK
authors.lastname: Wong
mesh_terms: D003952:Diagnostic Imaging / Q000639:trends; D004867:Equipment Design; D008027:Light; D017895:Manganese Compounds / Q000737:chemistry*; D055096:Optical Devices; D010783:Photometry / Q000295:instrumentation*; D012666:Semiconductors; D012825:Silicon / Q000737:chemistry*
chemical_list: D017895:Manganese Compounds; C494384:manganite; D012825:Silicon