Laser-Induced
Flash-Evaporation Printing CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> Thin Films for High-Performance Planar
Solar Cells
- Publication date
- Publisher
Abstract
Organic–inorganic
hybrid perovskites have been emerging
as promising light-harvesting materials for high-efficiency solar
cells recently. Compared to solution-based methods, vapor-based deposition
technologies are more suitable in preparing compact, uniform, and
large-scale perovskite thin films. Here, we utilized flash-evaporation
printing (FEP), a laser-induced ultrafast single source evaporation
method employing a carbon nanotube evaporator, to fabricate high-quality
methylammonium lead iodide perovskite thin films. Stoichiometric films
with pure tetragonal perovskite phase can be achieved using a controlled
methylammonium iodide to lead iodide ratio in evaporation precursors.
The film crystallinity and crystal grain growth could further be promoted
after postannealing. Planar solar cells (0.06 cm<sup>2</sup>) employing
these perovskite films exhibit a champion power conversion efficiency
(PCE) of 16.8% with insignificant hysteresis, which is among the highest
reported PCEs using vapor-based deposition methods. Large-area (1
cm<sup>2</sup>) devices based on such perovskite films also achieved
a stabilized PCE of 11.2%, indicating the feasibility and scalability
of our FEP method in fabricating large-area perovskite films for other
optoelectronic applications