WorksheetsOrganic Thin Films Characterization
Total questions: 30
Worksheet time: 15mins
What are the organic materials
Small molecule
Polymer
Both
What is OLED?
Organic Layer Enginering Diagram
Organic Light Emitting Devices
Organic Light Emitting Diodes
What is exciton?
Electron charges
Pair of hole-electron charges
Hole charges
Converting photon/light to energy are mechanism for....
Solar Cells
Light emitting diodes
Photo diode
What are advantages of organic electronics
Low cost
Flexible & robust
Biodegradable
All of the above
For the discovery of "conductive polymer", Nobel Prize in Chemistry 2000 were awarded to;
Alan J Heeger
Alan G McDiarmid
Hideki Shirakawa
All of the above
What are basic structures for organic solar cell?
Single layer
Bilayer
Bulk Heterojunction
Ordered bulk heterojunction
By using AFM, what mode can be use to characterized the bulk heterojunction thin film in solar cell
Morphology
Phase Modulation
All of the above
What is HOMO
hole occupied molecular orbital
high occupied molecular orbital
low occupied molecular orbital
What are the process when light/photon illuminate the thin films
Reflectance
Transmittance
Absorbance
All of the above
What are the use of absorbance
Calculate band gap
Determine substance in sample
Determine optical constant
All of the above
What are the parameter in material that determine the solar cell efficiency
Transmittance
Absorbance
Reflectance
What are the emission probability in photoluminescence
20-25%
30-35%
55-60%
75-80%
In photoluminescence process, what will happen when the organic material absorb the light/photon
formation of exciton
electron excited so trilet excited state
electron excited so singlet excited state
What is LUMO
hole occupied molecular orbital
low unoccupied molecular orbital
low occupied molecular orbital
What are advantages of AFM compare to SEM
particle size measurement
provide 3D morphology
provide material element
What is the Field Effect Transistor Functions
To control the flow of an electrical current (rectifier)
To turn on/off electrical current (switch)
To magnify current/voltage (amplifier)
All of the above
In cyclic voltammetry, oxidation offset are equal to
HOMO
LUMO
Band gap
What type of current generated by solar cells?
DC
AC
None of all above
What are the use of photoluminescence
to determine the material substance/concentration
to determine the band gap
to predict the light emission wavelength
HOMO are equivalent to
conduction band
valence band
band gap
In AFM, the atomic-resolution imaging can be achived by
Force Modulation Mode
STM mode
Condcutive Mode
Band gap are equal to
HOMO
LUMO
Value Difference between HOMO and LUMO
In cyclic voltammetry, reduction offset are equal t
HOMO
LUMO
Band gap
LUMO are equivalent to
conduction band
valence band
band gap
Work function are important as it will influence the performance of our device due to the injection barrier. What are the mode in AFM that can be use to measure the work function
Tapping Mode
Kelvin Probe Mode
Contact Mode
What are the component for cyclic voltammetry
Counter electrode
Reference electrode
Working electrode
Analyte
All of the above
What are the layer for basic OLED
emitting layer
electrode for hole injection
electrode for electron injection
all of the above
In OLED, what is the cathode characteristic
Low work function
Transparent
High work function
The first OLED was introduced by
Alan J Heeger & Hideki Shirakawa
Alan G McDiarmid & Hideki Shirakawa
Chin Tang & Van Slyke
