Prospects for concentrating photovoltaic (CPV) power are growing as the market increasingly values high power conversion efficiency to leverage now-dominant balance of system and soft costs. This trend is particularly acute for rooftop photovoltaic power, where delivering the high efficiency of traditional CPV in the form factor of a standard rooftop photovoltaic panel could be transformative. Here, we demonstrate a fully automated planar microtracking CPV system <2 cm thick that operates at fixed tilt with a microscale triple-junction solar cell at >660× concentration ratio over a 140^∘ full field of view. In outdoor testing over the course of two sunny days, the system operates automatically from sunrise to sunset, outperforming a 17%-efficient commercial silicon solar cell by generating >50% more energy per unit area per day in a direct head-to-head competition. These results support the technical feasibility of planar microtracking CPV to deliver a step change in the efficiency of rooftop solar panels at a commercially relevant concentration ratio.

随着市场越来越重视高功率转换效率，以利用目前占优势的系统和软成本之间的平衡，聚光光伏（CPV）功率的前景日益增长。对于屋顶光伏发电而言，这种趋势尤为突出，因为以标准屋顶光伏面板的形式交付传统CPV的高效率可能会带来变革。在这里，我们演示了厚度小于2 cm的全自动平面微跟踪CPV系统，该系统以固定倾角与微型三结太阳能电池以大于660的浓度比在^{140∘上运行}完整的视野。在两个晴天的室外测试中，该系统从日出到日落自动运行，通过直接面对面每天每单位面积的发电量增加50％以上，从而超过了效率为17％的商用硅太阳能电池竞赛。这些结果支持了平面微跟踪CPV的技术可行性，从而可以在商业上相关的浓度比下实现屋顶太阳能电池板效率的逐步变化。