Dipole-field-assisted charge extraction in metal-perovskite-metal back-contact solar cells

Hybrid organic-inorganic halide perovskites are low-cost solution-processable solar cell materials with photovoltaic properties that rival those of crystalline silicon. The perovskite films are typically sandwiched between thin layers of hole and electron transport materials, which efficiently extra...

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Bibliographic Details
Published in:Nature communications 2017-09, Vol.8 (1), p.613-8, Article 613
Main Authors: Lin, Xiongfeng, Jumabekov, Askhat N., Lal, Niraj N., Pascoe, Alexander R., Gómez, Daniel E., Duffy, Noel W., Chesman, Anthony S. R., Sears, Kallista, Fournier, Maxime, Zhang, Yupeng, Bao, Qiaoliang, Cheng, Yi-Bing, Spiccia, Leone, Bach, Udo
Format: Article
Language:English
Subjects:
639/301/357/341
639/4077/909/4101/4096/946
Charge transport
Dipoles
Electron transport
Energy conversion
Energy conversion efficiency
Extraction
Fabrication
Gold
Humanities and Social Sciences
Low cost
Metals
Monolayers
multidisciplinary
Perovskites
Photovoltages
Photovoltaic cells
Photovoltaics
Science
Science (multidisciplinary)
Self-assembled monolayers
Solar cells
Thin films
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Summary:Hybrid organic-inorganic halide perovskites are low-cost solution-processable solar cell materials with photovoltaic properties that rival those of crystalline silicon. The perovskite films are typically sandwiched between thin layers of hole and electron transport materials, which efficiently extract photogenerated charges. This affords high-energy conversion efficiencies but results in significant performance and fabrication challenges. Herein we present a simple charge transport layer-free perovskite solar cell, comprising only a perovskite layer with two interdigitated gold back-contacts. Charge extraction is achieved via self-assembled monolayers and their associated dipole fields at the metal-perovskite interface. Photovoltages of ~600 mV generated by self-assembled molecular monolayer modified perovskite solar cells are equivalent to the built-in potential generated by individual dipole layers. Efficient charge extraction results in photocurrents of up to 12.1 mA cm −2 under simulated sunlight, despite a large electrode spacing. Simplified device concepts may become important for the development of low cost photovoltaics. Lin et al. report solar cells based on interdigitated gold back-contacts and metal halide perovskites where charge extraction is assisted via a dipole field generated by self-assembled molecular monolayers.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-017-00588-3