The fast-growing procedure （FGP） provides a simple, high-yield and lead （Pb）-release free method to prepare perovskite films. In the FGP, the ultra-dilute per- ovskite precursor solution is drop-cast onto a hot （...The fast-growing procedure （FGP） provides a simple, high-yield and lead （Pb）-release free method to prepare perovskite films. In the FGP, the ultra-dilute per- ovskite precursor solution is drop-cast onto a hot （-240℃） substrate where a perovskite film grows immediately ac- companied by the rapid evaporation of the host solvent. In this process, all the raw materials in the precursor solution are deposited into the final perovskite film. The potential pollution caused by Pb can be significantly reduced. Proper- ties of the FGP-processed perovskite films can be modulated by the precursor composition. While CH3NH3CI （MACI） affects the crystallization process and leads to full surface coverage, CH（NHz）2I （FAI） enhances the thermal stability of the film. Based on the optimized precursor composition of PbI2.（1-x）FAI.xMACI, x=0.75, FGP-processed planar het- erojunction perovskite solar cells exhibit power conversion efficiencies （PCEs） exceeding 15% with suppressed hysteresis and excellent reproducibility.展开更多
Perovskite solar cells have experienced an unprecedented rapid development in the power conversion efficiency（PCE）during the past 7 years,and the record PCE has been already comparable to the traditional polycrystal...Perovskite solar cells have experienced an unprecedented rapid development in the power conversion efficiency（PCE）during the past 7 years,and the record PCE has been already comparable to the traditional polycrystalline silicon solar cells.Presently,it is more urgent to address the challenge on device stability for the future commercial application.Recently,the inorganic cesium lead halide perovskite has been intensively studied as one of the alternative candidates to improve device stability through controlling the phase transition.The cesium（Cs）-doped perovskites show more superior stability comparing with organic methylammonium（MA）lead halide perovskite or formamidinium（FA）lead halide perovskite.Here,recent progress of the inorganic cesium application in organic-inorganic perovskite solar cells（PSCs）is highlighted from the viewpoints of the device efficiency and the device stability.展开更多
In this viewpoint,recent hot topics in the photovoltaic community,interdigitated back contact(IBC)cells,are systematically reviewed from the view of device configuration.Two categories of IBC designs on the most popul...In this viewpoint,recent hot topics in the photovoltaic community,interdigitated back contact(IBC)cells,are systematically reviewed from the view of device configuration.Two categories of IBC designs on the most popular perovskite solar cells(PSCs)were discussed,and a planar back-contact perovskite module was first proposed.The device configuration,fabrication methods,working mechanism,optimization strategies,and future development directions of this novel PSC module were put forward to show its superiorities in the module performance,processing difficulty,and extensible functionality among present perovskite modules,presenting promising potential to improve the competitiveness of perovskite technology in the photovoltaic market.展开更多
Inverted perovskite solar cells based on weakly polarized hole-transporting layers suffer from the problem of polarity mismatch with the perovskite precursor solution,resulting in a nonideal wetting surface.In additio...Inverted perovskite solar cells based on weakly polarized hole-transporting layers suffer from the problem of polarity mismatch with the perovskite precursor solution,resulting in a nonideal wetting surface.In addition to the bottom-up growth of the polycrystalline halide perovskite,this will inevitably worse the effects of residual strain and heterogeneity at the buried interface on the interfacial carrier transport and localized compositional deficiency.Here,we propose a multifunctional hybrid pre-embedding strategy to improve substrate wettability and address unfavorable strain and heterogeneities.By exposing the buried interface,it was found that the residual strain of the perovskite films was markedly reduced because of the presence of organic polyelectrolyte and imidazolium salt,which not only realized the halogen compensation and the coordination of Pb^(2+) but also the buried interface morphology and defect recombination that were well regulated.Benefitting from the above advantages,the power conversion efficiency of the targeted inverted devices with a bandgap of 1.62 eV was 21.93%and outstanding intrinsic stability.In addition,this coembedding strategy can be extended to devices with a bandgap of 1.55 eV,and the champion device achieved a power conversion efficiency of 23.74%.In addition,the optimized perovskite solar cells retained 91%of their initial efficiency(960 h)when exposed to an ambient relative humidity of 20%,with a T80 of 680 h under heating aging at 65℃,exhibiting elevated durability.展开更多
基金financially supported by the National Basic Research Program of China (973 Program) (2015CB932203)the National Natural Science Foundation of China (61377025, 91433203, and 11121091)+2 种基金the Young 1000 Talents Global Recruitment Program of Chinasupported by the US Office of Naval Research under contract N00014-15-1-2244the support from the US National Science Foundation (DMR-1305913 and OIA-1538893)
文摘The fast-growing procedure （FGP） provides a simple, high-yield and lead （Pb）-release free method to prepare perovskite films. In the FGP, the ultra-dilute per- ovskite precursor solution is drop-cast onto a hot （-240℃） substrate where a perovskite film grows immediately ac- companied by the rapid evaporation of the host solvent. In this process, all the raw materials in the precursor solution are deposited into the final perovskite film. The potential pollution caused by Pb can be significantly reduced. Proper- ties of the FGP-processed perovskite films can be modulated by the precursor composition. While CH3NH3CI （MACI） affects the crystallization process and leads to full surface coverage, CH（NHz）2I （FAI） enhances the thermal stability of the film. Based on the optimized precursor composition of PbI2.（1-x）FAI.xMACI, x=0.75, FGP-processed planar het- erojunction perovskite solar cells exhibit power conversion efficiencies （PCEs） exceeding 15% with suppressed hysteresis and excellent reproducibility.
基金Project supported by the 973 Program of China(No.2015CB932203)the National Natural Science Foundation of China(Nos.61377025,91433203)the Young 1000 Talents Global Recruitment Program of China
文摘Perovskite solar cells have experienced an unprecedented rapid development in the power conversion efficiency（PCE）during the past 7 years,and the record PCE has been already comparable to the traditional polycrystalline silicon solar cells.Presently,it is more urgent to address the challenge on device stability for the future commercial application.Recently,the inorganic cesium lead halide perovskite has been intensively studied as one of the alternative candidates to improve device stability through controlling the phase transition.The cesium（Cs）-doped perovskites show more superior stability comparing with organic methylammonium（MA）lead halide perovskite or formamidinium（FA）lead halide perovskite.Here,recent progress of the inorganic cesium application in organic-inorganic perovskite solar cells（PSCs）is highlighted from the viewpoints of the device efficiency and the device stability.
基金China Postdoctoral Science Foundation(2023M731476,2023T160286)Beijing Postdoctoral Research Foundation.
文摘In this viewpoint,recent hot topics in the photovoltaic community,interdigitated back contact(IBC)cells,are systematically reviewed from the view of device configuration.Two categories of IBC designs on the most popular perovskite solar cells(PSCs)were discussed,and a planar back-contact perovskite module was first proposed.The device configuration,fabrication methods,working mechanism,optimization strategies,and future development directions of this novel PSC module were put forward to show its superiorities in the module performance,processing difficulty,and extensible functionality among present perovskite modules,presenting promising potential to improve the competitiveness of perovskite technology in the photovoltaic market.
基金funded by the National Natural Science Foundation of China(62004165)the Fundamental Research Funds for the Central Universities.
文摘Inverted perovskite solar cells based on weakly polarized hole-transporting layers suffer from the problem of polarity mismatch with the perovskite precursor solution,resulting in a nonideal wetting surface.In addition to the bottom-up growth of the polycrystalline halide perovskite,this will inevitably worse the effects of residual strain and heterogeneity at the buried interface on the interfacial carrier transport and localized compositional deficiency.Here,we propose a multifunctional hybrid pre-embedding strategy to improve substrate wettability and address unfavorable strain and heterogeneities.By exposing the buried interface,it was found that the residual strain of the perovskite films was markedly reduced because of the presence of organic polyelectrolyte and imidazolium salt,which not only realized the halogen compensation and the coordination of Pb^(2+) but also the buried interface morphology and defect recombination that were well regulated.Benefitting from the above advantages,the power conversion efficiency of the targeted inverted devices with a bandgap of 1.62 eV was 21.93%and outstanding intrinsic stability.In addition,this coembedding strategy can be extended to devices with a bandgap of 1.55 eV,and the champion device achieved a power conversion efficiency of 23.74%.In addition,the optimized perovskite solar cells retained 91%of their initial efficiency(960 h)when exposed to an ambient relative humidity of 20%,with a T80 of 680 h under heating aging at 65℃,exhibiting elevated durability.
