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Exciton diffusion and dissociation in organic and quantum-dot solar cells

SmartMat 2023年第6期4卷 11-30页

作者： Dan He Miao Zeng Zhenzhen Zhang Yang Bai Guichuan Xing Hui-Ming Cheng Yuze Lin Department of Metallurgy and Applied Physical Chemistry College of Chemistry and Chemical EngineeringCentral South UniversityChangshaChina Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijingChina Faculty of Materials Science and Energy Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenChina Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacaoChina University of Chinese Academy of Sciences BeijingChina Australian Institute for Bioengineering and Nanotechnology The University of Queensland BrisbaneSt LuciaQueenslandAustralia

For the process of photovoltaic conversion in organic solar cells(OSCs)and quantum-dot solar cells(QDSCs),three of four steps are determined by exciton behavior,namely,exciton generation,exciton diffusion,and exciton ***,it is of great importance to regulate exciton behavior in OSCs and QDSCs for achieving high power conversion *** to the rapid development in materials and device fabrication,great progress has been made to manage the exciton behavior to achieve prolonged exciton diffusion length and improved exciton dissociation in recent *** this review,we first introduce the parameters that affect exciton behavior,followed by the methods to measure exciton diffusion ***,we provide an overview of the recent advances with regard to exciton behavior investigation in OSCs and QDSCs,including exciton lifetime,exciton diffusion coefficient,and exciton ***,we propose future directions in deepening the understanding of exciton behavior and boosting the performance of OSCs and QDSCs.

关键词： exciton behavior exciton diffusion exciton dissociation organic solar cells quantum-dot solar cells

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Fluoride passivation of ZnO electron transport layers for efcient PbSe colloidal quantum dot photovoltaics

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Frontiers of Optoelectronics 2023年第3期16卷 141-151页

作者： Jungang He You Ge Ya Wang Mohan Yuan Hang Xia Xingchen Zhang Xiao Chen Xia Wang Xianchang Zhou Kanghua Li Chao Chen Jiang Tang Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Hubei Engineering Technology Research Center of Optoelectronic and New Energy MaterialsSchool of Materials Science and EngineeringWuhan Institute of TechnologyWuhan 430205China Wuhan National Laboratory for Optoelectronics(WNLO) School of Optical and Electronic InformationSchool of Integrated CircuitsHuazhong University of Science and TechnologyWuhan 430074China

Lead selenide(PbSe)colloidal quantum dots(CQDs)are suitable for the development of the next-generation of photovoltaics(PVs)because of efcient multiple-exciton generation and strong charge coupling *** date,the reported high-efcient PbSe CQD PVs use spin-coated zinc oxide(ZnO)as the electron transport layer(ETL).However,it is found that the surface defects of ZnO present a difculty in completion of passivation,and this impedes the continuous progress of *** address this disadvantage,fuoride(F)anions are employed for the surface passivation of ZnO through a chemical bath deposition method(CBD).The F-passivated ZnO ETL possesses decreased densities of oxygen vacancy and a favorable band *** from these improvements,PbSe CQD PVs report an efciency of 10.04%,comparatively 9.4%higher than that of devices using sol-gel(SG)ZnO as *** are optimistic that this interface passivation strategy has great potential in the development of solution-processed CQD optoelectronic devices.

关键词： Zinc oxide Surface passivation Band alignment quantum-dot solar cells

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