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Soft Semiconductor Group
Marc A. Baldo
David Ciudad, Sebastian Reinke
Paul Azurne, Matthias Bahlke, Dan Congreve, Jean Anne Currivan,
Jiye Lee, Phil Reusswig, Saima Siddiqui, Nick Thompson, Tony Wu
Ultra High Vacuum Characterization
Thermal Evaporation System
• UPS
• AFM
• STM
• KPFM
• Solar Cells
• Organic LEDs
• Luminescent
Solar
Concentrators
Photonic
Materials,
Devices,
and
Systems
Energy,
Power
and
Electronics
Nanoscale
Science
and
Engineering
Dry Co2 Lithography
• Solar Cells and
Organic LEDs with
small feature sizes
Optics Laboratory
120
3.0
6.6
150 38
P3HT
8
4.3
BCP
4.8
ITO 5.2 4.7 4.9
PEDOT
:PSS
4.0
100
3.5
C60
Pc
P3HT
2.1
• Solar Simulator
• Photoluminescence Quantum Efficiency
• External Quantum Efficiency
• Optical Cryostat
• Micro-positioned Electrical Cryostat
• Electromagnet
External quantum efficiency (%)
Courtesy of Patrick Brown from the ONE LAB
Ag
7.0
15 35 15 100
C60 Pentacene (Pc)
80
60
40
20
0
400 450 500 550 600 650 700
Wavelength (nm)
Blue = ‘Shared Instrument’
Red = Collaboration Opportunity
Research Motivation
We seek to exploit the remarkable diversity of soft semiconductors - molecular materials held together by weak van der Waals
bonds. In contrast with the painstaking growth requirements of conventional semiconductors, soft semiconductors can be readily
and inexpensively deposited on a variety of materials at room temperature.
Texas Instruments
Sundstrom, et al. J. Phys. Chem. B. 103 2327 (1999)
An soft semiconductor circuit in photosynthesis. By exploiting
excitons and short range order, the energy payback time in
photosynthesis is as short as 2 days.
Pulling a silicon crystal from the melt. The manufacturing of highly ordered
semiconductors for solar cells and LEDs is energy intensive and expensive.
The energy payback time for Si solar cells is about 2 years.
We focus on two areas: organic light emitting devices, and low cost solar cells. We also have a growing interest in low energy switches.
On-going Research
Singlet Exciton Fission
solar radiation
(b)
PV PV/DBR
PV
Magnetic Logic
(c)
DBR/PV
Laser output power (a.u.)
(a)
solar radiation
Solar Concentrators
Integrated Organic Electronics
ON State: Output Current High
Input
Tunnel Junction
Output
z
y
x
Clock
Soft ferromagnet
OFF State: Output Current Low
Antiferromagnet
Domain wall (DW)
w power (a.u.)
Input
t
L
Tony Wu
Jiye Lee
Phil Reusswig
Paul Azunre
Sebastian Reinke
Jean Anne Currivan
Dan Congreve
Nick Thompson
Matthias Bahlke
Saima Siddiqui
David Ciudad
http://softsemi.mit.edu