title: Lead-free halide perovskite solar cells with high photocurrents realized through vacancy modulation.
abstract: Lead free perovskite solar cells based on a CsSnI3 light absorber with a spectral response from 950 nm is demonstrated. The high photocurrents noted in the system are a consequence of SnF2 addition which reduces defect concentrations and hence the background charge carrier density.
authors.affiliation: Energy Research Institute @NTU (ERI@N), Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, Singapore, 637553, Singapore; School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Singapore, 639798, Singapore.
authors.forename: Mulmudi Hemant
authors.initials: MH
authors.lastname: Kumar
authors.forename: Sabba
authors.initials: S
authors.lastname: Dharani
authors.forename: Wei Lin
authors.initials: WL
authors.lastname: Leong
authors.forename: Pablo P
authors.initials: PP
authors.lastname: Boix
authors.forename: Rajiv Ramanujam
authors.initials: RR
authors.lastname: Prabhakar
authors.forename: Tom
authors.initials: T
authors.lastname: Baikie
authors.forename: Chen
authors.initials: C
authors.lastname: Shi
authors.forename: Hong
authors.initials: H
authors.lastname: Ding
authors.forename: Ramamoorthy
authors.initials: R
authors.lastname: Ramesh
authors.forename: Mark
authors.initials: M
authors.lastname: Asta
authors.forename: Michael
authors.initials: M
authors.lastname: Graetzel
authors.forename: Subodh G
authors.initials: SG
authors.lastname: Mhaisalkar
authors.forename: Nripan
authors.initials: N
authors.lastname: Mathews
keywords: Cesium tin iodide; high photocurrent; lead free; perovskite solar cells; tin vacancy