slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Electricity from Light: The Grätzel Cell PowerPoint Presentation
Download Presentation
Electricity from Light: The Grätzel Cell

Loading in 2 Seconds...

play fullscreen
1 / 13

Electricity from Light: The Grätzel Cell - PowerPoint PPT Presentation


  • 109 Views
  • Uploaded on

Electricity from Light: The Grätzel Cell. Electromagnetic Spectrum. Increasing Energy — Decreasing Wavelength.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Electricity from Light: The Grätzel Cell' - omer


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

Electricity from Light:

The Grätzel Cell

slide2

Electromagnetic Spectrum

Increasing Energy — Decreasing Wavelength

10-16 10-12 10 -02 10 -8 10 -6 10 -4 10 --2 10 0 10 2 10 4 10 8l (m)

g-rays

X-rays

UV

IR

Microwave

FM

AM

Long Radio Waves

Radio Waves

400 500 600 700

Wavelength (l) in nanometers

slide5

Subtractive Coloration

If one component of white light is removed, the color registered by the eye is the complimentary color (opposite of the color removed).

donor acceptor concept
Donor-Acceptor Concept

Dye molecules can be broken into three separate pieces:

Electron Donor Group

Electron Acceptor Group

Bridge

• Electronegative

elements

• Polar with d-

opposite bridge

end.

• Cations

A place for the

e- to move into

higher energy

states.

Usually part of

The donor group

• Lone e- pairs

• Anions

• Polar with d-

at bridge end

donors
Donors

Increasing order of efficiency

acceptors
Acceptors

Increasing order of efficiency

slide10

UV/ Visible Spectrophotometer Scan

A

b

s

o

r

b

a

n

c

e

1.0

0.8

0.6

0.4

0.2

0.0

350

400

450

500

550

600

650

700

750

Wavelength in nanometers

slide11

What would happen if the electrons in the dye

molecule where captured and sent through a

curcuit?

slide12

I-/I3-

h

ITO

or

FTO

ITO

or

FTO

Porphyrin

TiO2

Preparation of a Grätzel Cell

ISC ~ 20 mA/cm2

VOC ~0.7 Volts

 ~ 1

Efficiency ~ 11%

Diagram courtesy of Dr. Wamser

slide13

-

-

ITO

TiO

TCPP

ITO

I

/ I

2

3

Porphyrin LUMO

-0.9

-0.6

hv

+0.2

+1.1

P+

Porphyrin HOMO

+2.6

2

V

= 0.7 V ; I

= 20 mA/cm

oc

sc

Operation of a Grätzel Cell

Diagram courtesy of Dr. Wamser