Overcoming Short-Circuit in Lead-Free CH3NH3SnI3 Perovskite Solar Cells via Kinetically Controlled Gas–Solid Reaction Film Fabrication Process
- 17 February 2016
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry Letters
- Vol. 7 (5), 776-782
- https://doi.org/10.1021/acs.jpclett.6b00118
Abstract
The development of Sn-based perovskite solar cells has been challenging because devices often show short-circuit behavior due to poor morphologies and undesired electrical properties of the thin films. A low-temperature vapor-assisted solution process (LT-VASP) has been employed as a novel kinetically controlled gas–solid reaction film fabrication method to prepare lead-free CH3NH3SnI3 thin films. We show that the solid SnI2 substrate temperature is the key parameter in achieving perovskite films with high surface coverage and excellent uniformity. The resulting high-quality CH3NH3SnI3 films allow the successful fabrication of solar cells with drastically improved reproducibility, reaching an efficiency of 1.86%. Furthermore, our Kelvin probe studies show the VASP films have a doping level lower than that of films prepared from the conventional one-step method, effectively lowering the film conductivity. Above all, with (LT)-VASP, the short-circuit behavior often obtained from the conventional one-step-fabricated Sn-based perovskite devices has been overcome. This study facilitates the path to more successful Sn-perovskite photovoltaic research.Funding Information
- Link Foundation
- Basic Energy Sciences (DE-SC0001059)
This publication has 40 references indexed in Scilit:
- High-performance photovoltaic perovskite layers fabricated through intramolecular exchangeScience, 2015
- Compositional engineering of perovskite materials for high-performance solar cellsNature, 2015
- High performance perovskite solar cells by hybrid chemical vapor depositionJournal of Materials Chemistry A, 2014
- Solvent engineering for high-performance inorganic–organic hybrid perovskite solar cellsNature Materials, 2014
- Planar Heterojunction Perovskite Solar Cells via Vapor-Assisted Solution ProcessJournal of the American Chemical Society, 2013
- Efficient planar heterojunction perovskite solar cells by vapour depositionNature, 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