Duan Xiaopeng, Liu Chunhui, Cai Yunhao, Ye Linglong, Xue Jingwei, Yang Yinuo, Ma Wei, Sun Yanming
School of Chemistry, Beihang University, Beijing, 100191, P. R. China.
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, P. R. China.
Adv Mater. 2023 Aug;35(32):e2302927. doi: 10.1002/adma.202302927. Epub 2023 Jun 27.
Semi-transparent organic solar cells (ST-OSCs) have great potential for application in vehicle- or building-integrated solar energy harvesting. Ultrathin active layers and electrodes are typically utilized to guarantee high power conversion efficiency (PCE) and high average visible transmittance (AVT) simultaneously; however, such ultrathin parts are unsuitable for industrial high-throughput manufacturing. In this study, ST-OSCs are fabricated using a longitudinal through-hole architecture to achieve functional region division and to eliminate the dependence on ultrathin films. A complete circuit that vertically corresponds to the silver grid is responsible for obtaining high PCE, and the longitudinal through-holes embedded in it allow most of the light to pass through,where the overall transparency is associated with the through-hole specification rather than the thicknesses of active layer and electrode. Excellent photovoltaic performance over a wide range of transparency (9.80-60.03%), with PCEs ranging from 6.04% to 15.34% is achieved. More critically, this architecture allows printable 300-nm-thick devices to achieve a record-breaking light utilization efficiency (LUE) of 3.25%, and enables flexible ST-OSCs to exhibit better flexural endurance by dispersing the extrusion stress into the through-holes. This study paves the way for fabricating high-performance ST-OSCs and shows great promise for the commercialization of organic photovoltaics.
半透明有机太阳能电池（ST-OSCs）在车辆或建筑集成太阳能收集方面具有巨大的应用潜力。通常采用超薄活性层和电极来同时保证高功率转换效率（PCE）和高平均可见光透过率（AVT）；然而，这种超薄部件不适用于工业高通量制造。在本研究中，通过纵向通孔结构制造ST-OSCs，以实现功能区域划分并消除对超薄膜的依赖。一个与银栅垂直对应的完整电路负责获得高PCE，嵌入其中的纵向通孔允许大部分光通过，整体透明度与通孔规格相关，而非活性层和电极的厚度。在9.80 - 60.03%的宽透明度范围内实现了优异的光伏性能，PCE范围为6.04%至15.34%。更关键的是，这种结构使可印刷的300纳米厚器件实现了破纪录的3.25%的光利用效率（LUE），并通过将挤压应力分散到通孔中使柔性ST-OSCs表现出更好的抗弯曲耐久性。本研究为制造高性能ST-OSCs铺平了道路，并显示出有机光伏商业化的巨大前景。
