Heterojunction Modification for Highly Efficient Organic–Inorganic Perovskite Solar Cells
Top Cited Papers
- 9 December 2014
- journal article
- Published by American Chemical Society (ACS) in ACS Nano
- Vol. 8 (12), 12701-12709
- https://doi.org/10.1021/nn505723h
Abstract
Organic-inorganic perovskites, such as CH₃NH₃PbX₃ (X = I, Br, Cl), have emerged as attractive absorber materials for the fabrication of low cost high efficiency solar cells. Over the last 3 years, there has been an exceptional rise in power conversion efficiencies (PCEs), demonstrating the outstanding potential of these perovskite materials. However, in most device architectures, including the simplest thin-film planar structure, a current voltage response displays an "anomalous hysteresis", whereby the power output of the cell varies with measurement time, direction and light exposure or bias history. Here we provide insight into the physical processes occurring at the interface between the n-type charge collection layer and the perovskite absorber. Through spectroscopic measurements, we find that electron transfer from the perovskite to the TiO₂ in the standard planar junction cells is very slow. By modifying the n-type contact with a self-assembled fullerene monolayer, electron transfer is "switched on", and both the n-type and p-type heterojunctions with the perovskite are active in driving the photovoltaic operation. The fullerene-modified devices achieve up to 17.3% power conversion efficiency with significantly reduced hysteresis, and stabilized power output reaching 15.7% in the planar p-i-n heterojunction solar cells measured under simulated AM 1.5 sunlight.9 page(sKeywords
Funding Information
- Office of Naval Research (N00014-11-1-0300)
- Advanced Research Projects Agency - Energy (DE-AC36-08GO28308)
- Engineering and Physical Sciences Research Council
This publication has 51 references indexed in Scilit:
- o-Methoxy Substituents in Spiro-OMeTAD for Efficient Inorganic–Organic Hybrid Perovskite Solar CellsJournal of the American Chemical Society, 2014
- Organohalide lead perovskites for photovoltaic applicationsEnergy & Environmental Science, 2014
- Organolead Halide Perovskite: New Horizons in Solar Cell ResearchThe Journal of Physical Chemistry C, 2014
- Perovskites: The Emergence of a New Era for Low-Cost, High-Efficiency Solar CellsThe Journal of Physical Chemistry Letters, 2013
- Efficient planar heterojunction perovskite solar cells by vapour depositionNature, 2013
- Organometal Perovskite Light Absorbers Toward a 20% Efficiency Low-Cost Solid-State Mesoscopic Solar CellThe Journal of Physical Chemistry Letters, 2013
- Sequential deposition as a route to high-performance perovskite-sensitized solar cellsNature, 2013
- Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide PerovskitesScience, 2012
- Lead Iodide Perovskite Sensitized All-Solid-State Submicron Thin Film Mesoscopic Solar Cell with Efficiency Exceeding 9%Scientific Reports, 2012
- Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic CellsJournal of the American Chemical Society, 2009