title: High-performance photoelectrochemical-type self-powered UV photodetector using epitaxial TiO₂/SnO₂ branched heterojunction nanostructure.
abstract: TiO₂/SnO₂ branched heterojunction nanostructure with TiO₂ branches on electrospun SnO2 nanofiber (B-SnO₂ NF) networks serves as a model architecture for efficient self-powered UV photodetector based on a photoelectrochemical cell (PECC). The nanostructure simultaneously offers a low degree of charge recombination and a direct pathway for electron transport. Without correcting 64.5% loss of incident photons through light absorption and scattering by the F-doped tin oxide (FTO) glass, the incident power conversion efficiency reaches 14.7% at 330 nm, more than twice as large as the nanocrystalline TiO₂ (TiO₂ NC, 6.4%)-film based PECC. By connecting a PECC to an ammeter, the intensity of UV light is quantified using the output short-circuit photocurrent density (J(sc)) without a power source. Under UV irradiation, the self-powered UV photodetector exhibits a high responsivity of 0.6 A/W, a high on/off ratio of 4550, a rise time of 0.03 s and a decay time of 0.01 s for J(sc) signal. The excellent performance of the B-SnO₂ NF-based PECC type self-powered photodetector will enable significant advancements for next-generation photodetection and photosensing applications.
authors.affiliation: School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, Gansu, PR China. lixd04@163.com
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Li
authors.forename: Caitian
authors.initials: C
authors.lastname: Gao
authors.forename: Huigao
authors.initials: H
authors.lastname: Duan
authors.forename: Bingan
authors.initials: B
authors.lastname: Lu
authors.forename: Youqing
authors.initials: Y
authors.lastname: Wang
authors.forename: Lulu
authors.initials: L
authors.lastname: Chen
authors.forename: Zhenxing
authors.initials: Z
authors.lastname: Zhang
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Pan
authors.forename: Erqing
authors.initials: E
authors.lastname: Xie
mesh_terms: D049329:Nanostructures / Q000737:chemistry*; D010777:Photochemistry / Q000379:methods*; D017971:Tin Compounds / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D017971:Tin Compounds; C009495:titanium dioxide; D014025:Titanium; C045358:stannic oxide