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High‐Efficiency Organic Tandem Solar Cells With Effective Transition Metal Chelates Interconnecting Layer
Author(s) -
Chang ShengYung,
Lin YuChe,
Sun Pengyu,
Hsieh YaoTsung,
Meng Lei,
Bae SangHoon,
Su YuWei,
Huang Wenchao,
Zhu Chenhui,
Li Gang,
Wei KungHwa,
Yang Yang
Publication year - 2017
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201700139
Subject(s) - tandem , materials science , work function , energy conversion efficiency , layer (electronics) , zirconium , optoelectronics , annealing (glass) , fabrication , chemistry , nanotechnology , composite material , metallurgy , medicine , alternative medicine , pathology
Organic tandem solar cells have two sub‐cells vertically connected via a tunnel junction (or interconnecting layer, ICL), which the ICL plays a critical role of determining the performance of the tandem cell. In this manuscript, we report a new design of the ICL consisting of zirconium (IV) acetylacetonate (Zr‐Acac) as the electron transport layer. The Zr‐Acac has a suitable work function to pin the Fermi‐level of the ICL and hence, can effectively behave as the charge recombination function for the tandem device. Comparing to the reference device consisting of ZnO ETL layer, the Zr‐Acac ICL can effectively enhance the efficiency by 20%, from 8.4 to 10.1% power conversion efficiencies. More importantly, the Zr‐Acac ETL layer functions effectively without thermal annealing, which not only simplifies the tandem solar cell processing, but also widens the front sub‐cell material selection.