Organic photovoltaic(OPV)cells hold great promise as next-generation green energy owing to their tunable photoelectronic properties and compatibility with large-area solution printing.However,most high-performance mat...Organic photovoltaic(OPV)cells hold great promise as next-generation green energy owing to their tunable photoelectronic properties and compatibility with large-area solution printing.However,most high-performance materials have been optimized primarily for standard sunlight,with limited strategies for multi-spectral illuminations.Here,we report two wide-bandgap donor polymers,PDBQx-γand PDBQx-β,integrating a dibenzo[f,h]quinoxaline unit and a two-dimensional benzodithiophene unit linked by alkyl-thiopheneπ-spacers.Optimized molecular design of PDBQx-βenables enhanced molecular packing,favorable morphology,and superior charge transport,delivering a power conversion efficiency(PCE)of 13.7%for PDBQx-β:FTCC-Br based on single-junction OPV cells under AM 1.5G illumination.Furthermore,the fabricated large-area OPV modules(23.6 cm2)achieve remarkable PCEs of 26.4%under 660 nm laser,20.8%under underwater illumination,and 27.3%under indoor light.This study demonstrates a molecular design strategy for wide-bandgap polymers intrinsically compatible with diverse light sources,advancing OPV technology toward multi-scene applications.展开更多
In order to solve the problems of color bias and visual deviation caused by inaccurate estimation of transmittance and atmospheric light in image defogging,a new algorithm based on multi-scale morphological reconstruc...In order to solve the problems of color bias and visual deviation caused by inaccurate estimation of transmittance and atmospheric light in image defogging,a new algorithm based on multi-scale morphological reconstruction with adaptive transmittance and atmospheric light correction was proposed.Firstly,the algorithm used the open operation under morphological reconstruction to replace the minimum filter operation in the dark channel,and used the morphological edge to set the scale of the open operation structure elements,and constructed a multi-scale open operation fusion dark channel.After morphological noise reduction,the exact initial transmittance was obtained.According to the relationship between brightness and saturation difference and transmittance,an adaptive transmittance correction model was fitted with Gaussian function to correct the initial transmittance of the sky fog map.Then the local atmospheric light was improved according to the image brightness information and morphology closure operation.Finally,the proposed algorithm was combined with the atmospheric scattering model to obtain an accurate fog free image.The experimental results showed that the proposed algorithm was suitable for fog image restoration under various scenes,the restoration effect was good,and the brightness was suitable.展开更多
基金support from the Beijing Municipal Science&Technology Commission(2254104)support from National Natural Science Foundation of China(NSFC,52120105005)support from NSFC(52473166).We thank the 1W1A Diffuse X-ray Scattering Beamline of Beijing Synchrotron Radiation Facility(https://cstr.cn/31109.02.BSRF.1W1A)for providing technical support and assistance in GIWAXS data collection.
文摘Organic photovoltaic(OPV)cells hold great promise as next-generation green energy owing to their tunable photoelectronic properties and compatibility with large-area solution printing.However,most high-performance materials have been optimized primarily for standard sunlight,with limited strategies for multi-spectral illuminations.Here,we report two wide-bandgap donor polymers,PDBQx-γand PDBQx-β,integrating a dibenzo[f,h]quinoxaline unit and a two-dimensional benzodithiophene unit linked by alkyl-thiopheneπ-spacers.Optimized molecular design of PDBQx-βenables enhanced molecular packing,favorable morphology,and superior charge transport,delivering a power conversion efficiency(PCE)of 13.7%for PDBQx-β:FTCC-Br based on single-junction OPV cells under AM 1.5G illumination.Furthermore,the fabricated large-area OPV modules(23.6 cm2)achieve remarkable PCEs of 26.4%under 660 nm laser,20.8%under underwater illumination,and 27.3%under indoor light.This study demonstrates a molecular design strategy for wide-bandgap polymers intrinsically compatible with diverse light sources,advancing OPV technology toward multi-scene applications.
基金supported by National Natural Science Foundation of China(No.61561030)College Industry Support Plan Project of Gansu Provincial Department of Education(No.2021CYZC-04)Educational Reform Fund of Lanzhou Jiaotong University(No.JG201928)。
文摘In order to solve the problems of color bias and visual deviation caused by inaccurate estimation of transmittance and atmospheric light in image defogging,a new algorithm based on multi-scale morphological reconstruction with adaptive transmittance and atmospheric light correction was proposed.Firstly,the algorithm used the open operation under morphological reconstruction to replace the minimum filter operation in the dark channel,and used the morphological edge to set the scale of the open operation structure elements,and constructed a multi-scale open operation fusion dark channel.After morphological noise reduction,the exact initial transmittance was obtained.According to the relationship between brightness and saturation difference and transmittance,an adaptive transmittance correction model was fitted with Gaussian function to correct the initial transmittance of the sky fog map.Then the local atmospheric light was improved according to the image brightness information and morphology closure operation.Finally,the proposed algorithm was combined with the atmospheric scattering model to obtain an accurate fog free image.The experimental results showed that the proposed algorithm was suitable for fog image restoration under various scenes,the restoration effect was good,and the brightness was suitable.
