Despite extensive studies on the mechanics of DNA under external constrains, such as tension, torsion, and bending, several important aspects have remained poorly understood. One biologically important example is the ...Despite extensive studies on the mechanics of DNA under external constrains, such as tension, torsion, and bending, several important aspects have remained poorly understood. One biologically important example is the mechanics of DNA under sharp bending conditions, which has been debated for a decade without thorough comprehension. The debate is about the interesting phenomenon raised from a series of different experiments: sharply bent DNA has a surprisingly high apparent bending flexibility that deviates from the canonical bending elasticity of DNA. This finding has motivated various theoretical models, which mainly incorporate the excitation of mechanical defects inside severely bent DNA molecules. Here, we review the recent progress on the understanding of the mechanics of sharply bent DNA and provide our view on this important question by interrogating the theoretical foundation of these experimental measurements.展开更多
Here, we report a trap-assisted photomultiplication （PM） phenomenon in solution-processed organic photodetectors （OPDs） using poly（3-hexylthiophene） （P3HT）： indene-C60 bisadduct （ICBA） as the active layer. ...Here, we report a trap-assisted photomultiplication （PM） phenomenon in solution-processed organic photodetectors （OPDs） using poly（3-hexylthiophene） （P3HT）： indene-C60 bisadduct （ICBA） as the active layer. The maximum external quantum efficiency （EQE） is 685% for the device with 2% ICBA doping ratio, which is much higher than that of OPDs with P3HT：ICBA （1：1） as the active layer. The PM phenomenon is attributed to the hole tunneling injection assisted by trapped electron in ICBA near A1 cathode, which can be demonstrated from the EQE spectra and transient photocurrent curves of OPDs with different ICBA doping ratios.展开更多
基金supported by the Mechanobiology Institute at National University of Singapore and Singapore Ministry of Education Academic Research Fund Tier 2 (Grant No. MOE2013-T2-1-154)
文摘Despite extensive studies on the mechanics of DNA under external constrains, such as tension, torsion, and bending, several important aspects have remained poorly understood. One biologically important example is the mechanics of DNA under sharp bending conditions, which has been debated for a decade without thorough comprehension. The debate is about the interesting phenomenon raised from a series of different experiments: sharply bent DNA has a surprisingly high apparent bending flexibility that deviates from the canonical bending elasticity of DNA. This finding has motivated various theoretical models, which mainly incorporate the excitation of mechanical defects inside severely bent DNA molecules. Here, we review the recent progress on the understanding of the mechanics of sharply bent DNA and provide our view on this important question by interrogating the theoretical foundation of these experimental measurements.
基金supported by the National Training Program of Innovation and Entrepreneurship for Undergraduates,Fundamental Research Funds for the Central Universities(Grant No.2014JBZ017)National Natural Science Foundation of China(Grant No.613770029)Beijing Natural Science Foundation(Grant No.2122050)
文摘Here, we report a trap-assisted photomultiplication （PM） phenomenon in solution-processed organic photodetectors （OPDs） using poly（3-hexylthiophene） （P3HT）： indene-C60 bisadduct （ICBA） as the active layer. The maximum external quantum efficiency （EQE） is 685% for the device with 2% ICBA doping ratio, which is much higher than that of OPDs with P3HT：ICBA （1：1） as the active layer. The PM phenomenon is attributed to the hole tunneling injection assisted by trapped electron in ICBA near A1 cathode, which can be demonstrated from the EQE spectra and transient photocurrent curves of OPDs with different ICBA doping ratios.
