A nonfullerene acceptor (NFA) with acceptor–donor–acceptor (A–D–A) architecture, i‐IEICO‐2F, based on 4,9‐dihydro‐s‐indaceno[1,2‐b:5,6‐b′]dithiophene as an electron‐donating core and 2‐(6‐fluoro‐2,3‐dihydro‐3‐oxo‐1H‐inden‐1‐ylidene)‐propanedinitrile as electron‐withdrawing end groups, is designed and synthesized. i‐IEICO‐2F has a twist structure in the main conjugated chain, which causes blueshifted absorption and leads to harmonious absorption with a high bandgap donor. The bandgap of i‐IEICO‐2F compliments the bandgap of suitable wide bandgap donor polymers such as J52, leading to complete light absorption throughout the visible spectrum. Devices based on i‐IEICO‐2F exhibit optimized photovoltaic performance including an open‐circuit voltage of 0.93 V, a short‐circuit current density of 16.61 mA cm⁻², and a fill factor of 73%, and result in a power conversion efficiency (PCE) of 11.28%. The i‐IEICO‐2F‐based devices reach PCEs of >11% without using any additives or post‐treatments. Devices are found to be thermally stable and maintain 44% of their initial PCE after 184.5 h of continuous thermal annealing (TA) treatment at 150 °C. Based on UV, atomic force microscopy (AFM), and grazing incidence wide angle X‐ray scattering (GIWAXS) results, i‐IEICO‐2F devices show almost identical morphology and molecular orientation throughout the TA treatment and excellent stability compared to other IEICO derivatives.

中文翻译：

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具有非共轭骨架的热耐用非富勒烯受体，用于高性能有机太阳能电池

一种非富勒烯受体（NFA），具有基于受体-供体-受体（AD）的架构，即i-IEICO-2F，基于4,9-二氢s-茚满[1,2- b：5,6 - b ′]二噻吩作为供电子核和2-（6-氟-2-，3-二氢-3-氧代-1 H设计并合成了作为茚并吸电子端基的茚并-1萘。i‐IEICO‐2F在共轭主链中具有扭曲结构，这会导致蓝移吸收，并导致带隙较大的供体获得和谐吸收。i‐IEICO‐2F的带隙与合适的宽带隙供体聚合物（例如J52）的带隙互补，从而在整个可见光谱范围内完全吸收光。基于i‐IEICO‐2F的设备展现出优化的光伏性能，包括0.93 V的开路电压，16.61 mA cm ^-2的短路电流密度，填充因子为73％，因此功率转换效率（PCE）为11.28％。基于i‐IEICO‐2F的设备无需使用任何添加剂或进行后处理即可达到> 11％的PCE。发现器件在150°C的连续热退火（TA）处理184.5 h后具有热稳定性，并保持其初始PCE的44％。根据紫外线，原子力显微镜（AFM）和掠入射广角X射线散射（GIWAXS）结果，与其他IEICO衍生物相比，i-IEICO-2F设备在整个TA处理过程中表现出几乎相同的形态和分子取向，并具有出色的稳定性。