Info
Info
News Article

Vapour Fix Raises Perovskite Crystal Performance

News

Hall measurements show that bromine vapour treatment enhanced the transport properties of hybrid perovskite crystals (orange)

A simple and noninvasive treatment could become a post-crystallisation process to optimise the optoelectronic properties of hybrid perovskite solar cell materials, according to researchers at KAUST (King Abdullah University of Science and Technology).

In this treatment, bromine vapours penetrate the surface of as-synthesised perovskite crystals to reach their deep-lying layers, removing surface and bulk defects generated during crystal growth.

Lead-containing hybrid perovskites, such as methylammonium lead tribromide (MAPbBr3), present unique charge transport properties and easy processability in solution. These make them attractive as potential low-cost alternatives to traditional silicon-based light-harvesting solar cell materials. However, approaches that use solution processing to crystallise them tend to leave contaminants, such as oxygen and amorphous carbon. These approaches also produce halide vacancies that create lead cations, which can trap electrons to form metallic lead and restrict charge transport.

Various chemical treatments can reduce these defects, but most tinker with the composition of the precursor solution to optimise thin film and crystal formation. However, the researchers from the KAUST Solar Center sought something simpler.

"We were interested in developing a facile recipe that could be applied once crystal formation was complete," says Ahmad Kirmani, now a postdoc at the National Renewable Energy Laboratory, U.S., who conducted the study under the supervision of Aram Amassian and Omar Mohammed.

Co-author Ahmed Mansour, now a postdoc at Helmholtz-Zentrum Berlin, Germany, describes how the researchers chose a bromine vapour treatment because they had previously observed the improved conductivity of graphene when exposed to bromine. "Bromine is a volatile liquid at room temperature and readily evapourates without the need for any external source of energy," Mansour says.

The researchers suspended MAPbBr3 crystals in a bromine-vapour-saturated environment and monitored the effects of bromine exposure on material properties.

They were pleasantly surprised to find that bromine vapours suppressed metallic lead on the surface as well as in the bulk of the crystals, Mohammed says. "This meant that we could access the bulk properties of these crystals, such as their electrical conductivity," he adds. Prolonged bromine exposure produced a dramatic 10,000-fold enhancement in bulk electrical conductivity and a 50-fold increase in carrier mobility. Further assessment revealed that perovskite crystallisation leaves behind voids and imperfections, which allows bromine to diffuse and permeate through the crystals.

Each of the former team members is currently exploring more applications for their treatment, such as for improving the power conversion efficiency of solar cells containing perovskite thin films as absorbers or for single-crystal devices--such as transistors, photodetectors and radiation detectors--that require excellent carrier mobility and intrinsic optoelectronic properties.

'Facile and noninvasive passivation, doping and chemical tuning of macroscopic hybrid perovskite crystals' by A.R Kirmani et al; PLoS ONE 15, e0230540 (2020)

EnBW Chooses Delta Inverters For 2.62 MWp Solar Farm In Kenzingen
A Promising Boost To Kesterite Solar Cells
Everoze Creates Skyray To Design And Engineer Great Solar PV Projects
New Innovation Set To Change Renewable Energy Market
New Energy Scout GmbH Becomes Part Of Basler & Hofmann AG
Midsummer And Rollgum Corp Team Up To Bring Solar Roofs To The Iberian Peninsula
Dr Armin Froitzheim Becomes SOLARWATT Chief Technology Officer
Midsummer’s Solar Cells Can Reduce Truck Fuel Emissions By Up To 20 Percent
Faber Infrastructure Launches Container-based Power Supply
NextEnergy Capital Acquires Its First Asset In Portugal 17.4MWp Solar PV Project
Sonnedix Named ESG Global Solar Power Generation Sector Leader By GRESB
EnergyLink3 And C4V Lead Tesla In Race To Less Toxic Mobile Battery Solution
Sunstore Solar Launches WattGrid, A New Range Of Turnkey Off-grid Power Systems
What Role Can Solar Energy Play In Enabling A Better Future And Meeting The UN Sustainable Development Goals?
BayWa R.e. Sells Subsidy-free Solar Farm In Spain To Commerz Real’s Impact Fund Klimavest
Solar Power As Rental Offer Launched By Aggreko
ENGIE And Kiwi Power Enter Netherlands’ Grid Flexibility Market
Luxcara Acquires Largest Independent PV Project In Germany From BELECTRIC
BISOL Supreme Facing Exceptional Sales
SunBrush Mobil Delivers Its New Cleaning Device For PV Tracking Systems To Chile
Azelio And JET ENERGY In MoU To Develop Storage Projects With Solar PV In Africa
Ingeteam Supplies Solar Inverters For PV Project Of More Than 100MW In Chile
Researchers Pinpoint Way To Improve CIGS Solar Cells
UK'S Largest Battery Ready To Balance The Grid

Info
Info
×
Search the news archive

To close this popup you can press escape or click the close icon.
Logo
×
Logo
×
Register - Step 1

You may choose to subscribe to the Solar + Power Magazine, the Solar + Power Newsletter, or both. You may also request additional information if required, before submitting your application.


Please subscribe me to:

 

You chose the industry type of "Other"

Please enter the industry that you work in:
Please enter the industry that you work in:
 
X
Info
X
Info
{taasPodcastNotification}