Additive engineering for high-performance room-temperature-processed perovskite absorbers with micron-size grains and microsecond-range carrier lifetimes
- 13 October 2017
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Energy & Environmental Science
- Vol. 10 (11), 2365-2371
- https://doi.org/10.1039/c7ee02272g
Abstract
Perovskite photovoltaics have attracted remarkable attention recently due to their exceptional power conversion efficiencies (PCE). State-of-the-art perovskite absorbers typically require thermal annealing steps for high film quality. However, the annealing process adds cost and reduces yield for device fabrication and may also hinder application in tandem photovoltaics and flexible/ultra-low-cost optoelectronics. Herein, we report an additive-based room-temperature process for realizing high-quality methylammonium lead iodide films with micron-sized grains (>2 μm) and microsecond-range carrier lifetimes (τ1 = 931.94 ± 89.43 ns; τ2 = 320.41 ± 43.69 ns). Solar cells employing such films demonstrate 18.22% PCE with improved current–voltage hysteresis and stability without encapsulation. Further, we reveal that room-temperature-processed perovskite film grain size strongly depends on the precursor aggregate size in the film-deposition solution and that additive-based tuning of aggregate properties enables enlarging grains to the micron scale. These results offer a new pathway for more versatile, cost-effective perovskite processing.Keywords
Funding Information
- Division of Biological Infrastructure (DBI-1266252)
- Division of Electrical, Communications and Cyber Systems (ECCS-1542015)
- Basic Energy Sciences (DE-SC0001517)
- Division of Materials Research (DMR-11-21107)
- Division of Emerging Frontiers (EF-0830093)
This publication has 34 references indexed in Scilit:
- Low trap-state density and long carrier diffusion in organolead trihalide perovskite single crystalsScience, 2015
- Perovskite/polymer monolithic hybrid tandem solar cells utilizing a low-temperature, full solution processMater. Horiz., 2015
- Review of recent progress in chemical stability of perovskite solar cellsJournal of Materials Chemistry A, 2014
- Interface engineering of highly efficient perovskite solar cellsScience, 2014
- Solvent engineering for high-performance inorganic–organic hybrid perovskite solar cellsNature Materials, 2014
- Controllable Self-Induced Passivation of Hybrid Lead Iodide Perovskites toward High Performance Solar CellsNano Letters, 2014
- Perovskite solar cells with a planar heterojunction structure prepared using room-temperature solution processing techniquesNature Photonics, 2013
- 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
- Synthesis and crystal structure of lead thiocyanate complexes with 18-crown-6 and two isomers of dicyclohexane-18-crown-6Polyhedron, 1994