Home > Press > New materials could help improve the performance of perovskite solar cells
Perovskites responding to light. Credit Greg Stewart/SLAC National Accelerator Laboratory) https://creativecommons.org/licenses/by-nc-sa/2.0/ |
Abstract:
New research could lead to the design of new materials to help improve the performance of perovskite solar cells (PSCs).
Perovskite solar cells are an emerging photovoltaic technology that has seen a remarkable rise in power conversion ef?ciency to above 20 per cent.
However, PSC performance is affected as the perovskite material contains ion defects that can move around over the course of a working day. As these defects move, they affect the internal electric environment within the cell.
The Perovskite material is responsible for absorbing light to create electronic charge, and also for helping to extract the charge into an external circuit before it is lost to a process called 'recombination'.
The majority of detrimental recombination can occur in different locations within the solar cell. In some designs it occurs predominantly within the perovskite, while in others it happens at the edges of the perovskite where it contacts the adjacent materials known as transport layers.
Researchers from the Universities of Portsmouth, Southampton and Bath have now developed a way to adjust the properties of the transport layers to encourage the ionic defects within the perovskite to move in such a way that they suppress recombination and lead to more efficient charge extraction - increasing the proportion of the light energy falling on the surface of the cell that can ultimately be used.
Dr Jamie Foster from the University of Portsmouth, who was involved in the study, said: "Careful cell design can manipulate the ionic defects to move to regions where they enhance the extraction of electronic charge, thereby increasing the useful power that a cell can deliver."
The study, published in Energy and Environmental Science, showed that the performance of PSCs are strongly dependent on the permittivity (the measure of a material's ability to store an electric field) and the effective doping density of the transport layers.
Dr Foster said: "Understanding how and which transport layer properties affect cell performance is vital for informing the design of cell architectures in order to obtain the most power while minimising degradation.
"We found that ion movement plays a signi?cant role in the steady-state device performance, through the resulting accumulation of ionic charge and band bending in narrow layers adjacent to the interfaces between the perovskite and the transport layers. The distribution of the electric potential is key in determining the transient and steady-state behaviour of a cell.
"Further to this, we suggest that the doping density and/or permittivities of each transport layer may be tuned to reduce losses due to interfacial recombination. Once this and the rate limiting charge carrier has been identi?ed, our work provides a systematic tool to tune transport layer properties to enhance performance."
The researchers also suggest that PSCs made using transport layers with low permittivity and doping are more stable, than those with high permittivity and doping. This is because such cells show reduced ion vacancy accumulation within the perovskite layers, which has been linked to chemical degradation at the edges of the perovskite layer.
####
For more information, please click here
Contacts:
Glenn Harris
44-023-808-42728
Copyright © University of Portsmounth
If you have a comment, please Contact us.Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.
Related Links |
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
Good as gold - improving infectious disease testing with gold nanoparticles April 5th, 2024
Perovskites
Chemical reactions can scramble quantum information as well as black holes April 5th, 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
Possible Futures
Discovery points path to flash-like memory for storing qubits: Rice find could hasten development of nonvolatile quantum memory April 5th, 2024
With VECSELs towards the quantum internet Fraunhofer: IAF achieves record output power with VECSEL for quantum frequency converters April 5th, 2024
Discoveries
Chemical reactions can scramble quantum information as well as black holes April 5th, 2024
New micromaterial releases nanoparticles that selectively destroy cancer cells April 5th, 2024
Utilizing palladium for addressing contact issues of buried oxide thin film transistors April 5th, 2024
Materials/Metamaterials/Magnetoresistance
Nanoscale CL thermometry with lanthanide-doped heavy-metal oxide in TEM March 8th, 2024
Focused ion beam technology: A single tool for a wide range of applications January 12th, 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
Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters
Simulating magnetization in a Heisenberg quantum spin chain 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
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 |
||