Smart solar windows with tunable light trapping enabled by polymer dispersed liquid crystals (Conference Presentation)

J. Murray, Dakang Ma, J. Munday
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Abstract

Windows provide an attractive platform for building integrated photovoltaics due to the presence of an existing glass substrate and their widespread deployment. A challenge in implementing integrated photovoltaics within windows are the competing design criteria between window transparency and solar cell efficiency. A common approach to address this conflict is to use a solar cell device with partially transparency in the visible range and strong light absorption in the UV and/or IR ranges. Recent research has also attempted to circumvent this trade-off using switchable materials that can transform from opaque and efficient to transparent but with poor photovoltaic performance. Here, we present a new alternative switchable device approach that couples a semiconductor solar absorber to a Polymer Dispersed Liquid Crystal (PDLC) cell. By applying an electric field these PDLC devices can be dynamically tuned from opaque, reflective and light diffusing in the off state to clear and transparent in the on state. By enabling light-trapping to greatly enhance solar cell efficiency, this off-state scattering makes PDLCs a particularly attractive option for the creation of solar windows. As an added benefit, the system provides control over haze for privacy and window reflectivity for reducing the lighting and heating costs. Enabled by the very low power requirements for maintaining the window’s transparent on-state, we also demonstrate potential for self-powering this switchable solar window.
利用聚合物分散液晶实现可调光捕获的智能太阳能窗(会议报告)
由于现有玻璃基板的存在及其广泛的部署,窗户为构建集成光伏提供了一个有吸引力的平台。在窗户内实现集成光伏的一个挑战是窗户透明度和太阳能电池效率之间的竞争设计标准。解决这一冲突的一种常见方法是使用在可见光范围内部分透明和在紫外和/或红外范围内强光吸收的太阳能电池装置。最近的研究也试图绕过这种权衡,使用可切换的材料,可以从不透明和高效转变为透明,但光伏性能较差。在这里,我们提出了一种新的替代开关器件方法,将半导体太阳能吸收器耦合到聚合物分散液晶(PDLC)电池上。通过施加电场,这些PDLC器件可以动态地从不透明、反射和光扩散的关闭状态调整到清晰、透明的打开状态。通过使光捕获大大提高太阳能电池的效率,这种非状态散射使pdlc成为创造太阳能窗户的特别有吸引力的选择。作为一个额外的好处,该系统提供了控制雾霾的隐私和窗户反射率,以减少照明和供暖成本。由于保持窗户透明开启状态的功耗要求非常低,我们还展示了这种可切换太阳能窗户的自供电潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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