Home > News > Engineering low-cost energy from plastic photovoltaics
October 8th, 2009
Engineering low-cost energy from plastic photovoltaics
Abstract:
David Lidzey and James Kingsley
Optimization of new and existing conjugated polymers for solar cells helps bring inexpensive renewable electricity closer to reality.
Over the last five years, many research groups3 have studied OPVs based on the polymer poly(3-hexylthiophene) (P3HT) and fullerene derivative phenyl-C61-butyric acid methyl ester (PCBM). These materials can form an interpenetrating network of nanoscale domains. When incident light excites an electron-hole pair in the P3HT, the electron hops across to the PCBM because of its different electronic-energy levels. This produces separated charges that can be extracted at the device electrodes to generate electricity. Unfortunately, the low optical absorption of P3HT in the near-IR and poorly matched energy levels result in a fundamental limit to the power efficiency that can be obtained from P3HT/PCBM devices. Nevertheless, the amount of existing research on these materials and their commercial availability make them an excellent test system for OPV research.
Over the last year, we have invested significant effort into understanding and optimizing P3HT/PCBM thin-film device fabrication. Wide-ranging improvements have enabled us to produce consistently high-performing OPVs. In particular, we have optimized device efficiency by varying film thickness and exploring the effect of varying the relative ratio of P3HT and PCBM in the composite film. The P3HT/PCBM films are cast from solution, and so we looked at the type of solvent used for casting. We investigated different techniques to ‘grow' a nanoscale-network-like structure of efficient charge-transporting pathways within the film, such as thermal annealing at various temperatures, and the use of a plasticizing solvent vapor to promote crystallization of the P3HT molecules. The latter technique increases hole mobility within the film and also extends the device sensitivity to red light.
Source:
spie.org
Bookmark:
| Related News Press |
News and information
Simulating magnetization in a Heisenberg quantum spin chain April 5th, 2024
NRL charters Navy’s quantum inertial navigation path to reduce drift April 5th, 2024
Discovery points path to flash-like memory for storing qubits: Rice find could hasten development of nonvolatile quantum memory April 5th, 2024
Announcements
NRL charters Navy’s quantum inertial navigation path to reduce drift April 5th, 2024
Discovery points path to flash-like memory for storing qubits: Rice find could hasten development of nonvolatile quantum memory April 5th, 2024
Environment
Billions of nanoplastics released when microwaving baby food containers: Exposure to plastic particles kills up to 75% of cultured kidney cells July 21st, 2023
Energy
Development of zinc oxide nanopagoda array photoelectrode: photoelectrochemical water-splitting hydrogen production January 12th, 2024
Shedding light on unique conduction mechanisms in a new type of perovskite oxide November 17th, 2023
Inverted perovskite solar cell breaks 25% efficiency record: Researchers improve cell efficiency using a combination of molecules to address different November 17th, 2023
The efficient perovskite cells with a structured anti-reflective layer – another step towards commercialization on a wider scale October 6th, 2023
Solar/Photovoltaic
Development of zinc oxide nanopagoda array photoelectrode: photoelectrochemical water-splitting hydrogen production January 12th, 2024
Shedding light on unique conduction mechanisms in a new type of perovskite oxide November 17th, 2023
Inverted perovskite solar cell breaks 25% efficiency record: Researchers improve cell efficiency using a combination of molecules to address different November 17th, 2023
Charged “molecular beasts” the basis for new compounds: Researchers at Leipzig University use “aggressive” fragments of molecular ions for chemical synthesis November 3rd, 2023
 |
||
 |
||
| The latest news from around the world, FREE | ||
 |
||
|
|
||
| Premium Products | ||
 |
||
|
Only the news you want to read!
Learn More |
||
 |
||
|
Full-service, expert consulting
Learn More |
||
|
|
||