TY - JOUR
T1 - Photovoltaic Performance of Phase-Pure Orthorhombic BiSI Thin-Films
AU - Tiwari, Devendra
AU - Alibhai, Dominic
AU - Cardoso Delgado, Fabiola
AU - Mombru, Maia
AU - Fermin, David
PY - 2019/5/28
Y1 - 2019/5/28
N2 - A single-precursor solution approach is developed for depositing stoichiometric BiSI thin films featuring pure paraelectric orthorhombic (Pnam) phase. The compact and homogeneous films are composed of flake-shaped grains oriented antiplanar to the substrate and display a sharp optical transition corresponding to a bandgap of 1.57 eV. Optical and Raman signatures of the thin films are rationalized using the quasiparticle G
0W
0@PBE0 and density functional perturbation theory calculations. Electrochemical impedance spectroscopy revealed n-type doping with valence and conduction band edges located at 4.6 and 6.2 eV below vacuum level, respectively. Planar BiSI solar cells are fabricated with the architecture: Glass/FTO/SnO
2/BiSI/F8/Au, where F8 is poly(9,9-di-n-octylfluorenyl-2,7-diyl), showing record conversion efficiency of 1.32% under AM 1.5 illumination.
AB - A single-precursor solution approach is developed for depositing stoichiometric BiSI thin films featuring pure paraelectric orthorhombic (Pnam) phase. The compact and homogeneous films are composed of flake-shaped grains oriented antiplanar to the substrate and display a sharp optical transition corresponding to a bandgap of 1.57 eV. Optical and Raman signatures of the thin films are rationalized using the quasiparticle G
0W
0@PBE0 and density functional perturbation theory calculations. Electrochemical impedance spectroscopy revealed n-type doping with valence and conduction band edges located at 4.6 and 6.2 eV below vacuum level, respectively. Planar BiSI solar cells are fabricated with the architecture: Glass/FTO/SnO
2/BiSI/F8/Au, where F8 is poly(9,9-di-n-octylfluorenyl-2,7-diyl), showing record conversion efficiency of 1.32% under AM 1.5 illumination.
KW - band structure
KW - BiSI
KW - G W @PBE0
KW - photovoltaic
KW - power conversion losses
KW - thin-film
UR - http://www.scopus.com/inward/record.url?scp=85066339075&partnerID=8YFLogxK
U2 - 10.1021/acsaem.9b00544
DO - 10.1021/acsaem.9b00544
M3 - Article (Academic Journal)
AN - SCOPUS:85066339075
SN - 2574-0962
VL - 2
SP - 3878
EP - 3885
JO - ACS Applied Energy Materials
JF - ACS Applied Energy Materials
IS - 5
ER -