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All‐Solution‐Processed Silver Nanowire Window Electrode‐Based Flexible Perovskite Solar Cells Enabled with Amorphous Metal Oxide Protection
Author(s) -
Lee Eunsong,
Ahn Jihoon,
Kwon HyeokChan,
Ma Sunihl,
Kim Kyungmi,
Yun Seongcheol,
Moon Jooho
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201702182
Subject(s) - materials science , electrode , tin oxide , amorphous solid , chemical engineering , layer (electronics) , sheet resistance , composite number , optoelectronics , nanotechnology , doping , composite material , chemistry , organic chemistry , engineering
Abstract Silver nanowire (AgNW)‐based transparent electrodes prepared via an all‐solution‐process are proposed as bottom electrodes in flexible perovskite solar cells (PVSCs). To enhance the chemical stability of AgNWs, a pinhole‐free amorphous aluminum doped zinc oxide ( a ‐AZO) protection layer is deposited on the AgNW network. Compared to its crystalline counterpart ( c ‐AZO), a ‐AZO substantially improves the chemical stability of the AgNW network. For the first time, it is observed that inadequately protected AgNWs can evanesce via diffusion, whereas a ‐AZO secures the integrity of AgNWs. When an optimally thick a ‐AZO layer is used, the a ‐AZO/AgNW/AZO composite electrode exhibits a transmittance of 88.6% at 550 nm and a sheet resistance of 11.86 Ω sq −1 , which is comparable to that of commercial fluorine doped tin oxide. The PVSCs fabricated with a configuration of Au/spiro‐OMeTAD/CH 3 NH 3 PbI 3 /ZnO/AZO/AgNW/AZO on rigid and flexible substrates can achieve power conversion efficiencies (PCEs) of 13.93% and 11.23%, respectively. The PVSC with the a ‐AZO/AgNW/AZO composite electrode retains 94% of its initial PCE after 400 bending iterations with a bending radius of 12.5 mm. The results clearly demonstrate the potential of AgNWs as bottom electrodes in flexible PVSCs, which can facilitate the commercialization and large‐scale deployment of PVSCs.