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Transparent Electrodes Consisting of a Surface‐Treated Buffer Layer Based on Tungsten Oxide for Semitransparent Perovskite Solar Cells and Four‐Terminal Tandem Applications
Author(s) -
Park Helen Hejin,
Kim Jincheol,
Kim Geunjin,
Jung Hyunmin,
Kim Songhee,
Moon Chan Su,
Lee Seon Joo,
Shin Seong Sik,
Hao Xiaojing,
Yun Jae Sung,
Green Martin A.,
HoBaillie Anita W. Y.,
Jeon Nam Joong,
Yang TaeYoul,
Seo Jangwon
Publication year - 2020
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.202000074
Subject(s) - materials science , oxide , tandem , layer (electronics) , tungsten , buffer (optical fiber) , niobium oxide , perovskite (structure) , electrode , optoelectronics , sputtering , opacity , nanotechnology , chemical engineering , thin film , optics , composite material , chemistry , metallurgy , electrical engineering , engineering , physics
For semitransparent devices with n‐i‐p structures, a metal oxide buffer material is commonly used to protect the organic hole transporting layer from damage due to sputtering of the transparent conducting oxide. Here, a surface treatment approach is addressed for tungsten oxide‐based transparent electrodes through slight modification of the tungsten oxide surface with niobium oxide. Incorporation of this transparent electrode technique to the protective buffer layer significantly recovers the fill factor from 70.4% to 80.3%, approaching fill factor values of conventional opaque devices, which results in power conversion efficiencies over 18% for the semitransparent perovskite solar cells. Application of this approach to a four‐terminal tandem configuration with a silicon bottom cell is demonstrated.