Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International



Home > News > Titania photovoltaic cell performance

December 20th, 2007

Titania photovoltaic cell performance

Abstract:
The high demand for efficient and inexpensive renewable energy sources is leading to increased research in organic photovoltaics. Among the different types of devices, dye-sensitized solar cells (DSSCs) based on porous titanium dioxide (TiO2) nanoparticle layers1 can achieve the highest efficiency, exceeding 10%. However, electron transport through a random TiO2 network is typically very slow.2 Improving its performance means developing novel organic dyes. Alternatively, replacing the TiO2 layer with one having a different nanostructure could also potentially achieve both improved charge transport and collection.

To this end, one could employ 1D nanostructures such as nanowires or nanotubes. Yet though 1D arrays enable simple pathways for electrons to reach electrodes, they also have smaller surface areas compared to random nanoparticle networks, thus leading to reduced performance. For example, the efficiency3 of 6.89% for an ∼20μm-long DSSC made of TiO2 nanotube arrays is still lower than that routinely achieved using a porous layer. Because increased surface areas can be obtained using longer nanotubes of smaller diameter, much effort has been invested in developing novel anodization procedures aimed at improving nanotube form and structure.3-6 Anodization conditions such as those determined by the type of electrolyte or the voltage applied, among others, measurably affect the morphology of the nanotubes (see Figure 1). However, the specific fabrication procedure employed also determines the crystal quality, as well as the defect types and densities, which in turn regulate charge transport.

Source:
spie.org

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Intelligent optical chip to improve telecommunications: An INRS team uses autonomous learning approaches for optical waveform generators to boost optical signal processing functionalities for current and future telecom applications October 15th, 2021

Using quantum Parrondo’s random walks for encryption: Asst Prof Kang Hao Cheong and his research team from SUTD have set out to apply concepts from quantum Parrondo’s paradox in search of a working protocol for semiclassical encryption October 15th, 2021

Cellular environments shape molecular architecture: Researchers glean a more complete picture of a structure called the nuclear pore complex by studying it directly inside cells October 15th, 2021

How to program DNA robots to poke and prod cell membranes: A discovery of how to build little blocks out of DNA and get them to stick to lipids has implications for biosensing and mRNA vaccines October 15th, 2021

Nanotubes/Buckyballs/Fullerenes/Nanorods

Graphene nanotubes provide a shortcut to add conductivity to powder coatings October 1st, 2021

Scientists demonstrate pathway to forerunner of nanotubes that could lead to widespread industrial fabrication September 17th, 2021

From anti-icing coatings to protection of containers with flammable liquids: heating films with graphene nanotubes enter the market August 20th, 2021

Submerged sensors to control wearable electronics: Scientists in Korea make hand-drawn and flexible pressure sensors that can control a phone from underwater August 18th, 2021

Discoveries

Intelligent optical chip to improve telecommunications: An INRS team uses autonomous learning approaches for optical waveform generators to boost optical signal processing functionalities for current and future telecom applications October 15th, 2021

Using quantum Parrondo’s random walks for encryption: Asst Prof Kang Hao Cheong and his research team from SUTD have set out to apply concepts from quantum Parrondo’s paradox in search of a working protocol for semiclassical encryption October 15th, 2021

Cellular environments shape molecular architecture: Researchers glean a more complete picture of a structure called the nuclear pore complex by studying it directly inside cells October 15th, 2021

How to program DNA robots to poke and prod cell membranes: A discovery of how to build little blocks out of DNA and get them to stick to lipids has implications for biosensing and mRNA vaccines October 15th, 2021

Announcements

Using quantum Parrondo’s random walks for encryption: Asst Prof Kang Hao Cheong and his research team from SUTD have set out to apply concepts from quantum Parrondo’s paradox in search of a working protocol for semiclassical encryption October 15th, 2021

Cellular environments shape molecular architecture: Researchers glean a more complete picture of a structure called the nuclear pore complex by studying it directly inside cells October 15th, 2021

How to program DNA robots to poke and prod cell membranes: A discovery of how to build little blocks out of DNA and get them to stick to lipids has implications for biosensing and mRNA vaccines October 15th, 2021

Molecular Sciences Software Institute receives $15 million grant from National Science Foundation October 15th, 2021

Energy

A sunny outlook for solar: New research demonstrates great promise of all-inorganic perovskite solar cells for improving the efficiencies of solar cells October 15th, 2021

Silver nanoparticles boost performance of microbial fuel cells September 17th, 2021

Gamechanger for clean hydrogen production, Curtin research finds: Curtin University research has identified a new, cheaper and more efficient electrocatalyst to make green hydrogen from water that could one day open new avenues for large-scale clean energy production September 17th, 2021

Cheaper hydrogen production: Efficient water and urea electrolysis with bimetallic yolk-shell nanoparticles September 10th, 2021

Solar/Photovoltaic

A sunny outlook for solar: New research demonstrates great promise of all-inorganic perovskite solar cells for improving the efficiencies of solar cells October 15th, 2021

Ultrafast & ultrathin: new physics professor at TU Dresden makes mysterious quantum world visible September 10th, 2021

The National Space Society Joins the Progressive Policy Institute in Supporting Rapid Development of Space Solar Power: Orbiting Solar Power Stations Would Help to Save the Environment August 20th, 2021

Harnessing sunlight to fuel the future through covalent organic frameworks: Scientists underscore the potential of a new class of materials to convert sunlight to fuel August 13th, 2021

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project