A series of polymer solar cells(PSCs) based on poly(diketopyrrolopyrrole-terthiophene)(PDPP3T) and[6,6]-phenyl-C71-butyric acid methyl ester(PC71BM) as active layer were fabricated to investigate the effect of 1,8-dii...A series of polymer solar cells(PSCs) based on poly(diketopyrrolopyrrole-terthiophene)(PDPP3T) and[6,6]-phenyl-C71-butyric acid methyl ester(PC71BM) as active layer were fabricated to investigate the effect of 1,8-diiodooctane(DIO) on the performance of PSCs. The power conversion efficiency(PCE) of PSCs was increased from 3.77 % to 4.37 % for the cells with DIO additive. The underlying reason may be attributed to that DIO additive could make PC71 BM more dispersive in the active layer,forming a better bi-continuous interpenetrating network for excition dissociation and charge carrier transport. Therefore, the short circuit current density(JSC) and fill factor(FF) was increased from 8.25 to 9.18 mA/cm2and from67.2 % to 70.0 % for the PSCs with DIO additive compared with PSCs without DIO additive.展开更多
This paper briefly introduces the conception and research history of the Great Oxidation Event(GOE) in the early Paleoproterozoic and summarizes the primary geological and geochemical records of this event. On the bas...This paper briefly introduces the conception and research history of the Great Oxidation Event(GOE) in the early Paleoproterozoic and summarizes the primary geological and geochemical records of this event. On the basis of these, we overview the significant progress in three fields of the GOE: the timing and process of its startup, its mechanisms, and its climatic-ecological effects. The records of mass-independent fractionation of sulfur isotopes suggest that the startup of the GOE might be multi-episodic, which is obviously inconsistent with the single-episodic opinion obtained from atmospheric model simulations. The fundamental mechanism of the GOE was the source of the atmospheric Oexceeding the sink, but it remains uncertain whether it was due to the increase in the source or the decrease in the sink. The GOE substantially affected the climate,biological evolution, and biogeochemical cycles, but the specific processes remain elusive. In consideration of the current progress, we propose four aspects for future explorations, including the construction of geological and geochemical proxies for extremely low atmospheric oxygen content(pO), how the GOE changed the evolutions of Earth’s habitability and the processes in deep Earth, and constraining the mechanism of the GOE by coupling geological events with different time scales.展开更多
基金supported by the Fundamental Research Funds for the Central Universities (2014YJS139)
文摘A series of polymer solar cells(PSCs) based on poly(diketopyrrolopyrrole-terthiophene)(PDPP3T) and[6,6]-phenyl-C71-butyric acid methyl ester(PC71BM) as active layer were fabricated to investigate the effect of 1,8-diiodooctane(DIO) on the performance of PSCs. The power conversion efficiency(PCE) of PSCs was increased from 3.77 % to 4.37 % for the cells with DIO additive. The underlying reason may be attributed to that DIO additive could make PC71 BM more dispersive in the active layer,forming a better bi-continuous interpenetrating network for excition dissociation and charge carrier transport. Therefore, the short circuit current density(JSC) and fill factor(FF) was increased from 8.25 to 9.18 mA/cm2and from67.2 % to 70.0 % for the PSCs with DIO additive compared with PSCs without DIO additive.
基金supported by the National Natural Science Foundation of China (Grant Nos. 41821001, 42172216, 41873027)the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB26000000)the 111 Project of China (Grant No. BP0820004)。
文摘This paper briefly introduces the conception and research history of the Great Oxidation Event(GOE) in the early Paleoproterozoic and summarizes the primary geological and geochemical records of this event. On the basis of these, we overview the significant progress in three fields of the GOE: the timing and process of its startup, its mechanisms, and its climatic-ecological effects. The records of mass-independent fractionation of sulfur isotopes suggest that the startup of the GOE might be multi-episodic, which is obviously inconsistent with the single-episodic opinion obtained from atmospheric model simulations. The fundamental mechanism of the GOE was the source of the atmospheric Oexceeding the sink, but it remains uncertain whether it was due to the increase in the source or the decrease in the sink. The GOE substantially affected the climate,biological evolution, and biogeochemical cycles, but the specific processes remain elusive. In consideration of the current progress, we propose four aspects for future explorations, including the construction of geological and geochemical proxies for extremely low atmospheric oxygen content(pO), how the GOE changed the evolutions of Earth’s habitability and the processes in deep Earth, and constraining the mechanism of the GOE by coupling geological events with different time scales.
