Effect of gamma-rays on recombination dynamics and defect concentration in a wide bandgap perovskite  

作　　者：Aleksandra G.Boldyreva Marina M.Tepliakova Artyom V.Novikov Vladimir G.Petrov Olga Parfenova Alexander A.Golubnichiy Anton Vasilev Danila Saranin Keith J.Stevenson 

机构地区：[1]Center of Energy Science and Technology,Skolkovo Institute of Science and Technology,Bolshoy Boulevard 30,bld.1,Moscow 121205,Russia [2]Lomonosov Moscow State University,Department of Chemistry,Leninskie Gory.1bld.3,Moscow 119991,Russia [3]National University of Science and Technology MISiS,Leninskiy Prospekt 4,Moscow 119049,Russia

出　　处：《Light(Advanced Manufacturing)》2024年第4期136-145,共10页光(先进制造)(英文)

基　　金：supported by Russian Science Foundation(project No.23-72-01114).

摘　　要：Herein,we have explored the recombination dynamics and defect concentration of a mixed cation mixed halide perovskite Cs_(0.17)FA_(0.83)PbI_(1.8)Br_(1.2)with 1.75 eV bandgap after exposure to a gamma-ray source(2.5 Gy/min).We used photoluminescent spectroscopy to observe changes in recombination dynamics on perovskite films,impedance spectroscopy to reveal the contribution of interface recombination,and admittance spectroscopy to define the activation energy and concentration of defects.It was revealed that moderate doses(up to 10 kGy)passivate defects with activation energy≈0.5 eV and at the same time form new defects that cause dramatic growth of the diffusion coefficient and migration of mobile ions.These two processes with opposite direction result in high radiation tolerance of the studied material and solar cells up to 10 kGy.Doses above 10 kGy are detrimental for perovskite solar cells,mainly due to the growing role of interface recombination.The results encourage the use of the wide bandgap perovskite Cs_(0.17)FA_(0.83)PbI_(1.8)Br_(1.2)as a material for tandem solar cells with potential applications in a space environment.

关 键 词：Perovskite solar cells Radiation tolerance GAMMA-RAYS Wide bandgap perovskite material Tandem solar cells 

分 类 号：O61[理学—无机化学]