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Hwang, Inchan,Um, Han-Don,Kim, Byeong-Su,Wober, Munib,Seo, Kwanyong The Royal Society of Chemistry 2018 Energy & environmental science Vol.11 No.3
<P>Much attention has been paid to thin crystalline silicon (c-Si) photovoltaic devices due to their excellent flexibility characteristics, stable efficiency, and possibility of use as highly efficient next-generation flexible photovoltaic devices (FPVs). To fabricate thin c-Si FPVs, it is important to improve their light-absorption properties while maintaining the flexible characteristics. In this study, vertically aligned microwires (MWs) on a 50 μm-thick thin c-Si substrate are designed for novel FPVs. Increasing the length of the MWs enhances the optical properties of the thin c-Si without affecting its flexibility. To maximize the efficiency of the thin c-Si FPVs with MWs, tapered MWs and a localized back-contact structure are devised. This device shows a maximum efficiency of 18.9%. In addition, the proposed thin c-Si FPV with MWs shows high stability without any change in efficiency, even with 1000 bending cycles with a bending radius of 12 mm. Thus, we successfully demonstrate battery-free flexible electronic devices integrated with our thin c-Si FPVs with MWs.</P>
Filter-Free Image Sensor Pixels Comprising Silicon Nanowires with Selective Color Absorption
Park, Hyunsung,Dan, Yaping,Seo, Kwanyong,Yu, Young J.,Duane, Peter K.,Wober, Munib,Crozier, Kenneth B. American Chemical Society 2014 NANO LETTERS Vol.14 No.4
<P>The organic dye filters of conventional color image sensors achieve the red/green/blue response needed for color imaging, but have disadvantages related to durability, low absorption coefficient, and fabrication complexity. Here, we report a new paradigm for color imaging based on all-silicon nanowire devices and no filters. We fabricate pixels consisting of vertical silicon nanowires with integrated photodetectors, demonstrate that their spectral sensitivities are governed by nanowire radius, and perform color imaging. Our approach is conceptually different from filter-based methods, as absorbed light is converted to photocurrent, ultimately presenting the opportunity for very high photon efficiency.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-4/nl404379w/production/images/medium/nl-2013-04379w_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl404379w'>ACS Electronic Supporting Info</A></P>