El Nino and East Asian monsoon - City University of Hong Kong

parkagendaElectronics - Devices

Nov 2, 2013 (3 years and 9 months ago)

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Breaking Through the Materials
Bottleneck
:

Recent Progresses in the Fields of
Organic Transistors and Organic
Solar Cells at Polyera Corporation


Dr He Yan


VP of Product Development, Polyera Corporation




Date:
17

June

20
10

(T
hurs
day)

Time:
02
:
3
0

p
m (tea reception:
02
:
1
5
p
m)


Venue:
P4
704

Academic Building

City University of Hong Kong



Enquiry: 2788
-
7
829







Centre Of Super
-
Diamond and Advanced Films (COSDAF)

Department of Physics and Materials Science

Joint
Seminar




Breaking Through the Materials
Bottleneck
:

Recent Progresses in the Fields of
Organic Transistors and Organic
Solar Cells at Polyera

Corporation


Dr He Yan


VP of Product Development, Polyera Corporation


ABSTRACT

In the past few years, the fields of Organic Transistors and Organic Solar Cells have been attracting
extensive research attentions from both academia and industry around the

world. The advancing of
these fields had been limited by the development of organic/polymeric materials with special
electrical properties. This presentation will introduce some recent material developments at Polyera
that allowed for major advances of th
e Organic Transistor Field.


More specifically, for the area of Organic Transistors, it is highly desirable to have both p
-

and n
-
type organic semiconductors with high
-
performance to construct complimentary circuits (CMOS
circuits), because CMOS circuits
are at least 10x more powerful and efficient than single
-
polarity
circuits. Although p
-
type organic semiconductors had already demonstrated impressive
performance, the development of n
-
type organic semiconductors had been extremely slow and
seriously limit
ing the development of Organic Transistor field. This presentation will introduce the
first ever high
-
mobility (up to 0.8cm2/Vs) n
-
type polymeric semiconductor in the field of organic
transistors. This n
-
type semiconductor not only exhibited excellent elec
trical characteristics
comparable to state
-
of
-
art p
-
type semiconductors, it also had great air stability and good
compatibility with various printing techniques. With these features, printed CMOS invertors were
demonstrated with unprecedented performance.
This development opened up tremendous
opportunities of applications of organic materials in the Printed Electronics industry. Following this
progress, Polyera developed another n
-
type semiconductor in 2010 with mobility about 3 cm2/Vs
and exceptional bias
stress stability at least 3000 hours under accelerated conditions. With such
mobility and stability, organic transistor materials can be considered as a possible candidate of
backplanes for AMOLED.


For the area of Organic Solar Cells, there had been rapi
d progress of power conversion efficiency in
the past two years from 5% to about 8%. An important approach to enhance Organic Solar Cell
efficiency is to develop low band
-
gap polymers that have wide absorption in solar spectrum. This
presentation will brie
fly introduce the general design rationales of low
-
band
-
gap polymers in the
organic solar cell community, and discuss about the low
-
band
-
gap polymers developed at Polyera
giving >7% power conversion efficiency.


References:

1.
Nature, (2009), 457, 679
-
687

2.
Advanced Materials, (2008), 20, 3393
-
3398