Inorganic hole transport materials, particularly NiO_X, have shown considerable promise in boosting the efficiency and stability of perovskite solar cells. However, a major barrier to commercialization of NiO_X-based ...Inorganic hole transport materials, particularly NiO_X, have shown considerable promise in boosting the efficiency and stability of perovskite solar cells. However, a major barrier to commercialization of NiO_X-based perovskite solar cells with positive-intrinsic-negative architectures is their direct contact with the absorbing layer, which can lead to losses of photovoltage and fill factor. Furthermore, highly positive under-coordinated Ni cations degrade the perovskite at the interface. Here, we address these issues with the use of an ionic compound(QAPyBF_(4)) as an additive to passivate defects throughout the perovskite layer and improve carrier conduction and interactions with under-coordinated Ni cations. Specifically,the highly electronegative inorganic anion [BF_(4)]~- interacts with the NiO_x/perovskite interface to passivate under-coordinated cations(Ni^(≥3+)). Accordingly, the decorated cells achieved a power conversion efficiency of 23.38% and a fill factor of 85.5% without a complex surface treatment or NiO_X doping.展开更多
Lewis acid–base passivation is a significant technique to achieve structural stability of perovskite solar cells(PSCs) by overcoming the issues of wide grain boundaries, crystal defects, and the instability of PSCs. ...Lewis acid–base passivation is a significant technique to achieve structural stability of perovskite solar cells(PSCs) by overcoming the issues of wide grain boundaries, crystal defects, and the instability of PSCs. In this work, the combined effects of thiophene with phthalocyanine(Pc) as isomers(S2 and S3)on the photovoltaic performance of PSCs were studied for the first time. Through density functional theory calculations, we confirmed that the position of the S atom in the structure affects Lewis acid–base interactions with under-coordinated Pb^(2+) sites. The morphology of methylammonium lead iodide(MAPbI_(3)) for passivated devices was improved and thin dense layers with compact surface and large grain size were observed, leading to improvement of the charge extraction ability and reduction of non-radiative recombination and the trap density. A highest power conversion efficiency of 18% was achieved for the Pc S3 passivated device, which was 6.69% more than that of the controlled device.Furthermore, the Pcs passivated devices demonstrated remarkable stability under high-moisture and high-temperature conditions.展开更多
The international journal Environmental Science&Ecotechnology(ESE),co-organized by the Chinese Society for Environmental Sciences,Harbin Institute of Technology and Chinese Research Academy of Environmental Scienc...The international journal Environmental Science&Ecotechnology(ESE),co-organized by the Chinese Society for Environmental Sciences,Harbin Institute of Technology and Chinese Research Academy of Environmental Sciences,is launched in 2020.ESE aims to cover cutting-edge environmental science and ecotechnology research in a timely fashion.It is positioned to build an influential and professional exchange platform for the global scientific community.This is an important step to build an ecological civilization and a beautiful China,achieve green and sustainable development,and fulfill our commitment to the campaign of global environmental improvement.展开更多
基金supported by the National Key Research and Development Project from the Ministry of Science and Technology of China (No. 2021YFB3800103)National Natural Science Foundation of China (22209068)+1 种基金General Program of Basic Research in Shenzhen (JCYJ20220530112801004)the Major Program of Guangdong Basic and Applied Research Foundation (Nos. 2019B1515120083, 2019B121205001 and 2019B030302009)。
文摘Inorganic hole transport materials, particularly NiO_X, have shown considerable promise in boosting the efficiency and stability of perovskite solar cells. However, a major barrier to commercialization of NiO_X-based perovskite solar cells with positive-intrinsic-negative architectures is their direct contact with the absorbing layer, which can lead to losses of photovoltage and fill factor. Furthermore, highly positive under-coordinated Ni cations degrade the perovskite at the interface. Here, we address these issues with the use of an ionic compound(QAPyBF_(4)) as an additive to passivate defects throughout the perovskite layer and improve carrier conduction and interactions with under-coordinated Ni cations. Specifically,the highly electronegative inorganic anion [BF_(4)]~- interacts with the NiO_x/perovskite interface to passivate under-coordinated cations(Ni^(≥3+)). Accordingly, the decorated cells achieved a power conversion efficiency of 23.38% and a fill factor of 85.5% without a complex surface treatment or NiO_X doping.
基金supported by the National Natural Science Foundation of China(21975116)the Guangdong-Hong Kong-Macao Joint Laboratory(2019B121205001)the Major Program of Guangdong Basic and Applied Research(2019B030302009)。
文摘Lewis acid–base passivation is a significant technique to achieve structural stability of perovskite solar cells(PSCs) by overcoming the issues of wide grain boundaries, crystal defects, and the instability of PSCs. In this work, the combined effects of thiophene with phthalocyanine(Pc) as isomers(S2 and S3)on the photovoltaic performance of PSCs were studied for the first time. Through density functional theory calculations, we confirmed that the position of the S atom in the structure affects Lewis acid–base interactions with under-coordinated Pb^(2+) sites. The morphology of methylammonium lead iodide(MAPbI_(3)) for passivated devices was improved and thin dense layers with compact surface and large grain size were observed, leading to improvement of the charge extraction ability and reduction of non-radiative recombination and the trap density. A highest power conversion efficiency of 18% was achieved for the Pc S3 passivated device, which was 6.69% more than that of the controlled device.Furthermore, the Pcs passivated devices demonstrated remarkable stability under high-moisture and high-temperature conditions.
文摘The international journal Environmental Science&Ecotechnology(ESE),co-organized by the Chinese Society for Environmental Sciences,Harbin Institute of Technology and Chinese Research Academy of Environmental Sciences,is launched in 2020.ESE aims to cover cutting-edge environmental science and ecotechnology research in a timely fashion.It is positioned to build an influential and professional exchange platform for the global scientific community.This is an important step to build an ecological civilization and a beautiful China,achieve green and sustainable development,and fulfill our commitment to the campaign of global environmental improvement.
