High-Throughput Computing Guided Low/High Index Optical Coupling Layer for Record-Performance Semitransparent Organic Solar Cells

摘要

Semitransparent organic solar cells (ST-OSCs) can be made in differentcolors, allowing light to pass through, and yet absorb enough visible andnear-infrared (NIR) light to generate electricity. However, it remains achallenge to achieve high performing ST-OSCs over the two competingindexes of power conversion efficiency (PCE) and average visibletransmittance (AVT). This work reports an effort to developrecord-performance ST-OSCs using a low/high index optical coupling layer(OCL) and a 2D photonic-structured antireflective (AR) coating.High-throughput optical screening is used to improve the understanding ofOCL structure?performance relationships and the predicting of NIRabsorption enhancement for ST-OSCs. The concurrent use of a low/highindex Na_3AlF_6 (170 nm)/ZnS (110 nm) OCL, identified among about 200thousand simulated device configurations and a 900 nm pitch-sized 2Dphotonic-structured AR coating, fabricated using nanoimprint lithography,enables the record-performance ternary PM6:BTP-eC9:L8-BO-based ST-OSCs,achieving simultaneously a record-high PCE of 15.2, a high AVT of 32, animpressive light utilization efficiency of 4.86, and a favorablecolor-rendering index of 82. The results of the ST-OSCs demonstrated in thiswork provide an attractive option for a plethora of applications in self-poweredgreenhouses and building-integrated photovoltaic systems.