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Organic-inorganic hybrid perovskites have demonstrated tremendous potential for the next-generation electronic and optoelectronic devices due to their remarkable carrier dynamics. Current studies are focusing on polycrystals, since controlled growth of device compatible single crystals is extremely challenging. Here, the first chemical epitaxial growth of single crystal CH NH PbBr with controlled locations, morphologies, and orientations, using combined strategies of advanced microfabrication, homoepitaxy, and low temperature solution method is reported. The growth is found to follow a layer-by-layer model. A light emitting diode array, with each CH NH PbBr crystal as a single pixel, with enhanced quantum efficiencies than its polycrystalline counterparts is demonstrated.

With the rapid development of Internet technology, various new media platforms have emerged consequently impacting many aspects of our lives (Kim and Jeon 2016). The emergence of various media and communication platforms changed the way people exchange information, turned then-existed one-way communication into two-way communication, and laid the foundation for the development various social media. Furthermore by the creation of a platform to share videos, video content is getting more popular, leading the emergence of many websites that users can share various kinds of video content. Recently, as marketing strategy has shifted to consumer-oriented methods rather than corporate-oriented methods (Shin 2007), the importance of word of mouth (WOM) information through social network services (SNS) has increased, and personal sources of information have played an increasingly important role in WOM (Cho and Jeong 2013). Also, consumers now prefer getting information from online video websites rather than from traditional form of media like television and radio (Herold 2008; Hu et al. 2016). Consumers are not only getting information easily through video sharing platforms, but also using them as an opportunity to express themselves through online Abstract Recently, general people posting vlog on newly shopped fashion and cosmetics items are gaining popularity, and it is growing more common to get consumer reviews or opinion through vlogs. In this paper, we examine the effect of vloggers' attributes (i.e., attractiveness, expertise, trustworthiness) depending on the types that the vlogs expose certain products in videos. Also we find out how emotional bond between vloggers and viewers affect the relationships of vlogger's attributes with content sharing intention and attitude towards products. Based on the results of one-way ANOVA, multiple regression analysis, and moderated regression analysis, we could enhance the understanding of vlog and vloggers' role in retail. Also, we applied para-social interaction to find out how emotional bond between vloggers and viewers affect their perception. This research implies the need of understanding vlog as a form of marketing mix that fashion retailers can utilize.

Heteroepitaxial growth of lattice mismatched materials has advanced through the epitaxy of thin coherently strained layers, the strain sharing in virtual and nanoscale substrates, and the growth of thick films with intermediate strain-relaxed buffer layers. However, the thermal mismatch is not completely resolved in highly mismatched systems such as in GaN-on-Si. Here, geometrical effects and surface faceting to dilate thermal stresses at the surface of selectively grown epitaxial GaN layers on Si are exploited. The growth of thick (19 µm), crack-free, and pure GaN layers on Si with the lowest threading dislocation density of 1.1 × 10 cm achieved to date in GaN-on-Si is demonstrated. With these advances, the first vertical GaN metal-insulator-semiconductor field-effect transistors on Si substrates with low leakage currents and high on/off ratios paving the way for a cost-effective high power device paradigm on an Si CMOS platform are demonstrated.