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

Xiongfeng Lin, Askhat N. Jumabekov, Niraj N. Lal, Alexander R. Pascoe, Daniel E. Gómez, Noel W. Duffy, Anthony S. R. Chesman, Kallista Sears, Maxime Fournier, Yupeng Zhang, Qiaoliang Bao, Yi-Bing Cheng, Leone Spiccia, Udo Bach

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20 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number613
Number of pages8
JournalNature Communications
Volume8
Issue number1
DOIs
Publication statusPublished - 1 Dec 2017

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