首页|Interface optimization and defects suppression via NaF introduction enable efficient flexible Sb2Se3 thin-film solar cells
Interface optimization and defects suppression via NaF introduction enable efficient flexible Sb2Se3 thin-film solar cells
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Sb2Se3 with unique one-dimensional(1D)crystal structure exhibits exceptional deformation tolerance,demonstrating great application potential in flexible devices.However,the power conversion efficiency(PCE)of flexible Sb2Se3 photovoltaic devices is temporarily limited by the complicated intrinsic defects and the undesirable contact interfaces.Herein,a high-quality Sb2Se3 absorber layer with large crystal grains and benign[hk1]growth orientation can be first prepared on a Mo foil substrate.Then NaF inter-mediate layer is introduced between Mo and Sb2Se3,which can further optimize the growth of Sb2Se3 thin film.Moreover,positive Na ion diffusion enables it to dramatically lower barrier height at the back contact interface and passivate harmful defects at both bulk and heterojunction.As a result,the cham-pion substrate structured Mo-foil/Mo/NaF/Sb2Se3/CdS/ITO/Ag flexible thin-film solar cell delivers an obviously higher efficiency of 8.03％and a record open-circuit voltage(Voc)of 0.492 V.This flexible Sb2Se3 device also exhibits excellent stability and flexibility to stand large bending radius and multiple bending times,as well as superior weak light photo-response with derived efficiency of 12.60％.This work presents an effective strategy to enhance the flexible Sb2Se3 device performance and expand its potential photovoltaic applications.
Sb2Se3Flexible solar cellsNaF intermediate layerInterface optimizationDefects suppression
Shenzhen Key Laboratory of Advanced Thin Films and Applications,Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China
CNRS,ISCR(Institut des Sciences Chimiques de Rennes),UMR 6226,Université de Rennes,Rennes F-35000,France
State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures,MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials,School of Resources,Environment and Materials,Guangxi University,Nanning 530004,Guangxi,China
国家自然科学基金国家自然科学基金Guangdong Basic and Applied Basic Research FoundationGuangdong Basic and Applied Basic Research FoundationScience and Technology plan project of Shenzhen,ChinaScience and Technology plan project of Shenzhen,Chinaopen foundation of Guangxi Key Laboratory of Processing for Nonferrous Metals and Featured MaterialsState Key Laboratory of Featured Metal Materials and Lifecycle Safety for Composite Structures,Guangxi University
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