MilliporeSigma
  • Home
  • Search Results
  • Niobium Doping Effects on TiO2 Mesoscopic Electron Transport Layer-Based Perovskite Solar Cells.

Niobium Doping Effects on TiO2 Mesoscopic Electron Transport Layer-Based Perovskite Solar Cells.

ChemSusChem (2015-04-22)
Dong Hoe Kim, Gill Sang Han, Won Mo Seong, Jin-Wook Lee, Byeong Jo Kim, Nam-Gyu Park, Kug Sun Hong, Sangwook Lee, Hyun Suk Jung
ABSTRACT

Perovskite solar cells (PSCs) are the most promising candidates as next-generation solar energy conversion systems. To design a highly efficient PSC, understanding electronic properties of mesoporous metal oxides is essential. Herein, we explore the effect of Nb doping of TiO2 on electronic structure and photovoltaic properties of PSCs. Light Nb doping (0.5 and 1.0 at %) increased the optical band gap slightly, but heavy doping (5.0 at %) distinctively decreased it. The relative Fermi level position of the conduction band is similar for the lightly Nb-doped TiO2 (NTO) and the undoped TiO2 whereas that of the heavy doped NTO decreased by as much as ∼0.3 eV. The lightly doped NTO-based PSCs exhibit 10 % higher efficiency than PSCs based on undoped TiO2 (from 12.2 % to 13.4 %) and 52 % higher than the PSCs utilizing heavy doped NTO (from 8.8 % to 13.4 %), which is attributed to fast electron injection/transport and preserved electron lifetime, verified by transient photocurrent decay and impedance studies.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Butyl alcohol, natural, ≥99.5%, FCC, FG
Sigma-Aldrich
Triethanolamine, reagent grade, 98%
Sigma-Aldrich
Titanium diisopropoxide bis(acetylacetonate), 75 wt. % in isopropanol
Sigma-Aldrich
Water-16O, ≥99.94 atom % 16O
Sigma-Aldrich
Triethanolamine, BioUltra, ≥99.5% (GC)
Sigma-Aldrich
Triethanolamine, puriss. p.a., ≥99% (GC)
Sigma-Aldrich
Triethanolamine, ≥99.0% (GC)
Sigma-Aldrich
2-Propanol, BioUltra, for molecular biology, ≥99.5% (GC)
Sigma-Aldrich
2-Propanol, anhydrous, 99.5%
Sigma-Aldrich
2-Propanol, ACS reagent, ≥99.5%
Sigma-Aldrich
2-Propanol, 99.5%, HPLC grade
Sigma-Aldrich
2-Propanol, electronic grade, 99.999% trace metals basis
SAFC
Triethanolamine
Sigma-Aldrich
2-Propanol, HPLC Plus, for HPLC, GC, and residue analysis, 99.9%, poly coated bottles
Sigma-Aldrich
2-Propanol, BioReagent, for molecular biology, ≥99.5%
Sigma-Aldrich
Titanium(IV) isopropoxide, 99.999% trace metals basis
Sigma-Aldrich
Water, deuterium-depleted, ≤1 ppm (Deuterium oxide)
Sigma-Aldrich
1-Butanol, anhydrous, 99.8%
Sigma-Aldrich
Isopropyl alcohol, ≥99.7%, FCC, FG
Sigma-Aldrich
Water, for molecular biology, sterile filtered
Sigma-Aldrich
Water, for cell biology, sterile ultrafiltered
Supelco
1-Butanol, suitable for HPLC, 99.8%
Sigma-Aldrich
Water, sterile-filtered, BioReagent, suitable for cell culture
Sigma-Aldrich
E-Toxate Water, endotoxin, free
Sigma-Aldrich
Water, PCR Reagent
Sigma-Aldrich
Water, Nuclease-Free Water, for Molecular Biology
Sigma-Aldrich
1-Butanol, for molecular biology, ≥99%
Sigma-Aldrich
Water, for embryo transfer, sterile-filtered, BioXtra, suitable for mouse embryo cell culture
Sigma-Aldrich
Titanium(IV) isopropoxide, ≥97.0%
Sigma-Aldrich
Titanium(IV) isopropoxide, packaged for use in deposition systems