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A Highly Conductive Titanium Oxynitride Electron‐Selective Contact for Efficient Photovoltaic Devices
Author(s) -
Yang Xinbo,
Lin Yuanbao,
Liu Jiang,
Liu Wenzhu,
Bi Qunyu,
Song Xin,
Kang Jingxuan,
Xu Fuzong,
Xu Lujia,
Hedhili Mohamed N.,
Baran Derya,
Zhang Xiaohong,
Anthopoulos Thomas D.,
De Wolf Stefaan
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202002608
Subject(s) - materials science , passivation , dopant , optoelectronics , titanium , crystalline silicon , work function , layer (electronics) , nanotechnology , silicon , photovoltaic system , energy conversion efficiency , electrical conductor , solar cell , doping , composite material , metallurgy , electrical engineering , engineering
Abstract High‐quality carrier‐selective contacts with suitable electronic properties are a prerequisite for photovoltaic devices with high power conversion efficiency (PCE). In this work, an efficient electron‐selective contact, titanium oxynitride (TiO x N y ), is developed for crystalline silicon (c‐Si) and organic photovoltaic devices. Atomic‐layer‐deposited TiO x N y is demonstrated to be highly conductive with a proper work function (4.3 eV) and a wide bandgap (3.4 eV). Thin TiO x N y films simultaneously provide a moderate surface passivation and enable a low contact resistivity on c‐Si surfaces. By implementation of an optimal TiO x N y ‐based contact, a state‐of‐the‐art PCE of 22.3% is achieved for a c‐Si solar cell featuring a full‐area dopant‐free electron‐selective contact. Simultaneously, conductive TiO x N y is proven to be an efficient electron‐transport layer for organic photovoltaic (OPV) devices. A remarkably high PCE of 17.02% is achieved for an OPV device with an electron‐transport TiO x N y layer, which is superior to conventional ZnO‐based devices with a PCE of 16.10%. Atomic‐layer‐deposited TiO x N y ETL on a large area with a high uniformity may help accelerate the commercialization of emerging solar technologies.