Search results

This article explores Japanese perceptions of nuclear technology from 1945 to 1956, the early stage of the introduction of nuclear technology, by using discourses of the government and of antinuclear civil movements. It is based on the theoretical framework that discourses construct social perceptions of science and technology. For this purpose, statements such as official documents of the Japanese government and declarations made by the antinuclear movement were used as main resources of analysis. This article finds that various technological aspects influenced the formation of the Japanese nuclear technological system. In addition, the Japanese government tried to keep open the possibility of developing nuclear weapons. It tried to justify its 'peaceful use of nuclear power' by portraying itself as the sole victim of nuclear weapons while hiding its intention to develop nuclear weapons. Moreover, the nuclear safety myth was formed at the beginning of the introduction of nuclear technology. As a result, we can see that in Japan, the nuclear safety myth was growing from the beginning of the introduction of nuclear technology amid a dichotomous understanding of good and bad uses of nuclear power and the desire to enter an advanced state of science and technology.

Control over carrier type and doping levels in semiconductor materials is key for optoelectronic applications. In colloidal quantum dots (CQDs), these properties can be tuned by surface chemistry modification, but this has so far been accomplished at the expense of reduced surface passivation and compromised colloidal solubility; this has precluded the realization of advanced architectures such as CQD bulk homojunction solids. Here we introduce a cascade surface modification scheme that overcomes these limitations. This strategy provides control over doping and solubility and enables n-type and p-type CQD inks that are fully miscible in the same solvent with complete surface passivation. This enables the realization of homogeneous CQD bulk homojunction films that exhibit a 1.5 times increase in carrier diffusion length compared with the previous best CQD films. As a result, we demonstrate the highest power conversion efficiency (13.3%) reported among CQD solar cells. ; This work was supported by Ontario Research Fund–Research Excellence program (ORF7—Ministry of Research and Innovation, Ontario Research Fund–Research Excellence Round 7), and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. This work was also supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2017R1A2B2009948).

Control over carrier type and doping levels in semiconductor materials is key for optoelectronic applications. In colloidal quantum dots (CQDs), these properties can be tuned by surface chemistry modification, but this has so far been accomplished at the expense of reduced surface passivation and compromised colloidal solubility; this has precluded the realization of advanced architectures such as CQD bulk homojunction solids. Here we introduce a cascade surface modification scheme that overcomes these limitations. This strategy provides control over doping and solubility and enables n-type and p-type CQD inks that are fully miscible in the same solvent with complete surface passivation. This enables the realization of homogeneous CQD bulk homojunction films that exhibit a 1.5 times increase in carrier diffusion length compared with the previous best CQD films. As a result, we demonstrate the highest power conversion efficiency (13.3%) reported among CQD solar cells. ; This work was supported by Ontario Research Fund–Research Excellence program (ORF7—Ministry of Research and Innovation, Ontario Research Fund–Research Excellence Round 7), and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. This work was also supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF- 2017R1A2B2009948). The authors acknowledge the financial support from QD Solar Inc.