slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Current Research PowerPoint Presentation
Download Presentation
Current Research

Loading in 2 Seconds...

play fullscreen
1 / 18

Current Research - PowerPoint PPT Presentation


  • 73 Views
  • Uploaded on

Current Research. David Cahen 11/ ’ 12. Bioelectronics Hybrid molecular/non-molecular, organic/inorganic Materials & Interfaces ALTERNATIVE ENERGY. Current Research. David Cahen 11/ ’ 12. Bioelectronics : Proteins as (Opto)Electronic Materials?

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 'Current Research' - noura


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

Current Research

David Cahen 11/’12

  • Bioelectronics
  • Hybrid molecular/non-molecular, organic/inorganic

Materials & Interfaces

  • ALTERNATIVE ENERGY
slide2

Current Research

David Cahen 11/’12

  • Bioelectronics: Proteins as (Opto)Electronic Materials?

Proteins as Organic NPs/core-shell QDs

“Doping” Proteins

  • Hybrid molecular/non-molecular, organic/inorganic

Materials & Interfaces

* Remaking Silicon and other Semicond.

  • ALTERNATIVE ENERGY

Chemistry & Physics of Light  Electrical Energy conversion

* High voltage Solar Cells

slide3

Research topics

David Cahen *12/’11

Motivation

  • Understanding & Curiosity (“Everest” research)
  • Help Meet Energy Challenge
  • Blend Electronics with Biology

QUESTIONS:

  • (How) can organic molecules change electronics (also with Kronik) ?
  • (How) can proteins be electronic materials (with M. Sheves) ?

Why doesn’t nature use electronic conduction ?

  • What are the real limits to efficiency x lifetime) /cost

of photovoltaic solar energy conversion? (with G. Hodes)

  • (How) can we make Solar Paint?
solar cell concepts and materials
Solar Cell Concepts and Materials

Basic science towards improving

(efficiency x lifetime) /cost of (any) solar cell

what are the real limits to PV energy conversion ?

  • Metal-Insulator-Semiconductor solar cells :

re-discovering Si

  • Mesoporous, nanocrystalline solid junctions 

 high voltage solar cells (with G. Hodes)

slide5

Solar Cell Concepts and Materials

Back contact

Poly-xtlinep-CdTe

V

Poly-xtlinen-CdS

Conductive oxide

Glass

h

Molecules as

“door-men”

Effects of molecule adsorption

on solar cell performance

Adsorbed molecule

HOW IS THIS POSSIBLE ?

CdTe

Adsorption at the PV junction - affects VOC ! ! !

CdS

slide6

…because…of physics of dipole layers!

Molecules

Pinholes

SC

idealized

cartoon

slide7

…because…of physics of dipole layers!

i.e., we can use even discontinuous incomplete monolayers

idealized

cartoon

Even poorly organized monolayers can do,

but

need at least average orientation

device outline

with M. Bendikov, L. Kronik, R. Naaman

A. Kahn (Princeton)

Device Outline

R = Dipole-forming Molecules

use

~10 nm

Metal Contact

Voc

Donor : Organic Light Absorber

or

~40 nm

~1 nm

+

l

R R R R R R R R R R R R R R R R R

l l l l l l l l l l l l l l l l l l

Monolayer: TrimethoxySilane

Acceptor:

Transparent Semiconductor

SiC, GaN, ZnO, TiO2

+

l

+

l

+

l

+

-

+

-

+

l

Metal Contact

+

l

DONOR

ACCEPTOR

which types of electronic conductors do we know

Diamond

Silicon

Cu

metals

Carbon Nanotubes

Pentacene

β-Carotene

Heme

Which types of electronic conductors do we know ?

semiconductors

Carbon

INORGANIC

ORGANIC

Bio-molecules?

Organic(semi)conductors

slide10

Transport

(yield, reproducibility)

Spectroscopy

electronic, electrical

optical +++

Transport

mechanisms

Electronics with Bio-Molecules?

Electronic Conduction through Proteins & Peptides

What controls transport?

High quality

device structures

Theory

Electron Transfer Models

Electronic structure

slide11

Top Electrode

Hg drop or “ready-made Au pad”

+50 mV

Au

Hanging Hg drop

Lift off float on (LOFO) - Gold

0.2mm2

109 proteins/contact

protein studies at single few molecules level

2μm

A

(more)

realistic

Cartoon!!

10 nm

Metallic substrate

Protein Studies at single/few molecules level

 So … use MACROscopic protein monolayers

slide13

but …

still, higher over-all currents large measuring ability gain

Is also a Cartoon!!

intimate 5 µm2 contact to a 0.5 nm2 /molecule monolayer ?

contact each grass leaf (~3 cm2) on 70×100 m2 soccer field[Akkerman]

…..

…..

contact

…..

…..

…..

…..

i v characteristics

Electrical top contact

Linker layer

Conducting substrate

contact

I-V characteristics

protein layers

Protein monolayer

Conducting substrate

slide17

Electron Transport Mechanisms (bR)

Temp. independent

Thermally activated

Sepunaru et al., JACS 2012

slide18

OPEN QUESTIONS

  • What are the basic solar light  electricity limits? Needed for better cells / solar paint / high Voltage cells

 Tailor solar cells with molecules

  • The inorganic / organic, non-molecular / molecular interface, the next frontier for electronics?
  • (How) can we use proteins as Bioelectronics building blocks? Why is Electron Transport across proteins so efficient ?
  • Study Peptides
  • Use also CP-AFM and Electrochemistry
  • Study biological function effects (e.g., CO/O2 on myoglobin)
  • Make new composite materials using protein / NP analogy

FURTHER collaborationin WIS with: R. Naaman, I. Lubomirsky, S.Cohen, H.Cohen, D. Oron

in Israel with Technion, Bar Ilan U, Tel Aviv U

outside Israelwith Princeton, Wageningen, UNSW, UT Dallas, NREL, U. Cyprus, Chiba U…...