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Niobium Doping Effects on TiO 2 Mesoscopic Electron Transport Layer‐Based Perovskite Solar Cells
Author(s) -
Kim Dong Hoe,
Han Gill Sang,
Seong Won Mo,
Lee JinWook,
Kim Byeong Jo,
Park NamGyu,
Hong Kug Sun,
Lee Sangwook,
Jung Hyun Suk
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201403478
Subject(s) - doping , materials science , photocurrent , perovskite (structure) , band gap , optoelectronics , energy conversion efficiency , mesoporous material , mesoscopic physics , nanotechnology , chemical engineering , condensed matter physics , chemistry , physics , biochemistry , catalysis , engineering
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 TiO 2 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 TiO 2 (NTO) and the undoped TiO 2 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 TiO 2 (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.