Solution-processed organic-inorganic halide perovskites have demonstrated immense potential
in photovoltaic applications, but scaling up the perovskite solar cell production is faced with big
challenges. Inkjet printing is a facile scalable approach to deposit thin films due to its cost-effectiveness
and near unity material utilization ratio, which makes it worthy of exploration from
the perspective of both environmental protection and economic benefit. The objective of my thesis
research is to develop the inkjet printing technology and to understand the underlying mechanisms
for efficiently fabricating perovskite thin films and solar cells.
Chapter 1 is dedicated to the background of organic-inorganic halide perovskite. Their
working principles and properties are reviewed. The objectives of my thesis are elaborated.
Chapter 2 is dedicated to the fabrication approaches for perovskite thin films. In particular, I
further elaborate the advantage of inkjet printing technology and current challenges to employ it to deposit perovskite thin films.
Chapter 3 describes all the characterizations methods used, including characterizations for
perovskite precursors (inks), perovskite thin films and perovskite solar cells used in the further
In Chapter 4, I have demonstrated that high-quality CH3
patterns, including dots,
uniform lines, and compact films, by inkjet printing under ambient condition. The dynamics of
perovskite droplets including spreading, coalescence and evaporation have been studied.
Crystallization processes of the perovskite during the inkjet printing processes have been studied.
Basing on these studies, I have achieved a champion power conversion efficiency (PCE) of 16.6%
for the ambient printed devices.
Exploration of novel perovskite compositions has a strong demand for high throughput
fabrication. In Chapter 5, I have developed a high throughput approach to deposit mixed
perovskite thin films by inkjet printing. Twenty-five FAx
perovskite films have
been fabricated via high throughput inkjet printing. Basing on these perovskite films, I have built
a properties database (including crystal phases, bandgaps, and PL lifetimes) to screen optimal
perovskite composition (MAPbBr0.75
Perovskite films with similar optimization levels can largely enhance the effectiveness
composition screening based on comparison of their properties. In Chapter 6, thirty mixed
tribromide perovskite films including FAx
, and Csx
have been fabricated via high throughput inkjet printing. The printing conditions under which printed
films shows similar optimization level have been examined. Optimal perovskite composition
) has been screened out for further high-photovoltage solar cells fabrication via
All-inorganic carbon-based perovskite solar cells with high efficiency and excellent stability
are promising for commercialization. In Chapter 7, I have developed a two-step inkjet printing
approach to deposit high-purity inorganic CsPbBr3
layers. Upon optimization of the print process
layers, I have achieved a efficiency of 8.37% with a Voc
of 1.49V for the printed all-inorganic
carbon-based perovskite solar cells.
Based on these studies, I have demonstrated that inkjet printing can be a facile and low-cost
approach to fabricate high quality perovskite thin films. For organic-inorganic perovskite
composition, it can be utilized to exploration of novel composition. For inorganic perovskite
compositions, it can be utilized to fabricate high-performance device.
Post a Comment